mirror of
https://github.com/RGBCube/serenity
synced 2025-07-28 21:17:44 +00:00
LibGL+LibSoftGPU: Move rendering related code to LibSoftGPU library
This introduces a new library, LibSoftGPU, that incorporates all rendering related features that formerly resided within LibGL itself. Going forward we will make both libraries completely independent from each other allowing LibGL to load different, possibly accelerated, rendering backends.
This commit is contained in:
Stephan Unverwerth
Brian Gianforcaro
parent
46b1c2d609
commit
ad3d5d43bd
12 changed files with 58 additions and 45 deletions
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@ -1,9 +1,4 @@
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set(SOURCES
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Tex/NameAllocator.cpp
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Tex/Sampler2D.cpp
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Tex/Texture2D.cpp
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Tex/TextureUnit.cpp
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Clipper.cpp
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GLBlend.cpp
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GLColor.cpp
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GLContext.cpp
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@ -18,9 +13,11 @@ set(SOURCES
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GLVert.cpp
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GLVertexArrays.cpp
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SoftwareGLContext.cpp
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SoftwareRasterizer.cpp
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DepthBuffer.cpp
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Tex/NameAllocator.cpp
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Tex/Sampler2D.cpp
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Tex/Texture2D.cpp
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Tex/TextureUnit.cpp
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)
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serenity_lib(LibGL gl)
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target_link_libraries(LibGL LibM LibCore LibGfx)
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target_link_libraries(LibGL LibM LibCore LibGfx LibSoftGPU)
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@ -1,83 +0,0 @@
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/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <AK/ScopeGuard.h>
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#include <LibGL/Clipper.h>
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namespace GL {
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bool Clipper::point_within_clip_plane(const FloatVector4& vertex, ClipPlane plane)
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{
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switch (plane) {
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case ClipPlane::LEFT:
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return vertex.x() >= -vertex.w();
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case ClipPlane::RIGHT:
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return vertex.x() <= vertex.w();
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case ClipPlane::TOP:
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return vertex.y() <= vertex.w();
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case ClipPlane::BOTTOM:
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return vertex.y() >= -vertex.w();
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case ClipPlane::NEAR:
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return vertex.z() >= -vertex.w();
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case ClipPlane::FAR:
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return vertex.z() <= vertex.w();
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}
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return false;
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}
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GLVertex Clipper::clip_intersection_point(const GLVertex& p1, const GLVertex& p2, ClipPlane plane_index)
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{
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// See https://www.microsoft.com/en-us/research/wp-content/uploads/1978/01/p245-blinn.pdf
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// "Clipping Using Homogeneous Coordinates" Blinn/Newell, 1978
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float w1 = p1.position.w();
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float w2 = p2.position.w();
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float x1 = clip_plane_normals[plane_index].dot(p1.position);
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float x2 = clip_plane_normals[plane_index].dot(p2.position);
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float a = (w1 + x1) / ((w1 + x1) - (w2 + x2));
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GLVertex out;
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out.position = p1.position * (1 - a) + p2.position * a;
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out.color = p1.color * (1 - a) + p2.color * a;
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out.tex_coord = p1.tex_coord * (1 - a) + p2.tex_coord * a;
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return out;
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}
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void Clipper::clip_triangle_against_frustum(Vector<GLVertex>& input_verts)
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{
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list_a = input_verts;
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list_b.clear_with_capacity();
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auto read_from = &list_a;
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auto write_to = &list_b;
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for (size_t plane = 0; plane < NUMBER_OF_CLIPPING_PLANES; plane++) {
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write_to->clear_with_capacity();
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// Save me, C++23
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for (size_t i = 0; i < read_from->size(); i++) {
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const auto& curr_vec = read_from->at((i + 1) % read_from->size());
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const auto& prev_vec = read_from->at(i);
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if (point_within_clip_plane(curr_vec.position, static_cast<ClipPlane>(plane))) {
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if (!point_within_clip_plane(prev_vec.position, static_cast<ClipPlane>(plane))) {
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auto intersect = clip_intersection_point(prev_vec, curr_vec, static_cast<ClipPlane>(plane));
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write_to->append(intersect);
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}
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write_to->append(curr_vec);
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} else if (point_within_clip_plane(prev_vec.position, static_cast<ClipPlane>(plane))) {
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auto intersect = clip_intersection_point(prev_vec, curr_vec, static_cast<ClipPlane>(plane));
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write_to->append(intersect);
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}
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}
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swap(write_to, read_from);
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}
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input_verts = *read_from;
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}
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}
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@ -1,58 +0,0 @@
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/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Vector.h>
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#include <LibGL/GLStruct.h>
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#include <LibGfx/Vector4.h>
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namespace GL {
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class Clipper final {
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enum ClipPlane : u8 {
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LEFT = 0,
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RIGHT,
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TOP,
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BOTTOM,
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NEAR,
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FAR
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};
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static constexpr u8 NUMBER_OF_CLIPPING_PLANES = 6;
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static constexpr u8 MAX_CLIPPED_VERTS = 6;
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static constexpr FloatVector4 clip_planes[] = {
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{ -1, 0, 0, 1 }, // Left Plane
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{ 1, 0, 0, 1 }, // Right Plane
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{ 0, 1, 0, 1 }, // Top Plane
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{ 0, -1, 0, 1 }, // Bottom plane
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{ 0, 0, 1, 1 }, // Near Plane
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{ 0, 0, -1, 1 } // Far Plane
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};
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static constexpr FloatVector4 clip_plane_normals[] = {
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{ 1, 0, 0, 0 }, // Left Plane
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{ -1, 0, 0, 0 }, // Right Plane
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{ 0, -1, 0, 0 }, // Top Plane
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{ 0, 1, 0, 0 }, // Bottom plane
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{ 0, 0, 1, 0 }, // Near Plane
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{ 0, 0, -1, 0 } // Far Plane
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};
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public:
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Clipper() { }
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void clip_triangle_against_frustum(Vector<GLVertex>& input_vecs);
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private:
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bool point_within_clip_plane(const FloatVector4& vertex, ClipPlane plane);
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GLVertex clip_intersection_point(const GLVertex& vec, const GLVertex& prev_vec, ClipPlane plane_index);
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Vector<GLVertex> list_a;
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Vector<GLVertex> list_b;
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};
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}
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@ -1,44 +0,0 @@
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/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "DepthBuffer.h"
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namespace GL {
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DepthBuffer::DepthBuffer(Gfx::IntSize const& size)
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: m_size(size)
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, m_data(new float[size.width() * size.height()])
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{
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}
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DepthBuffer::~DepthBuffer()
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{
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delete[] m_data;
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}
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float* DepthBuffer::scanline(int y)
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{
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VERIFY(y >= 0 && y < m_size.height());
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return &m_data[y * m_size.width()];
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}
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void DepthBuffer::clear(float depth)
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{
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int num_entries = m_size.width() * m_size.height();
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for (int i = 0; i < num_entries; ++i) {
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m_data[i] = depth;
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}
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}
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void DepthBuffer::clear(Gfx::IntRect bounds, float depth)
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{
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bounds.intersect({ 0, 0, m_size.width(), m_size.height() });
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for (int y = bounds.top(); y <= bounds.bottom(); ++y)
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for (int x = bounds.left(); x <= bounds.right(); ++x)
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m_data[y * m_size.width() + x] = depth;
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}
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}
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@ -1,29 +0,0 @@
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/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGfx/Rect.h>
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#include <LibGfx/Size.h>
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namespace GL {
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class DepthBuffer final {
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public:
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DepthBuffer(Gfx::IntSize const&);
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~DepthBuffer();
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float* scanline(int y);
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void clear(float depth);
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void clear(Gfx::IntRect bounds, float depth);
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private:
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Gfx::IntSize m_size;
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float* m_data { nullptr };
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};
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}
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@ -5,9 +5,6 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "SoftwareGLContext.h"
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#include "GLStruct.h"
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#include "SoftwareRasterizer.h"
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#include <AK/Assertions.h>
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#include <AK/Debug.h>
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#include <AK/Format.h>
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#include <AK/TemporaryChange.h>
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#include <AK/Variant.h>
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#include <AK/Vector.h>
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#include <LibGL/GLStruct.h>
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#include <LibGL/SoftwareGLContext.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Painter.h>
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#include <LibGfx/Vector4.h>
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#include <LibSoftGPU/SoftwareRasterizer.h>
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using AK::dbgln;
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@ -6,23 +6,23 @@
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#pragma once
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#include "Clipper.h"
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#include "GLContext.h"
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#include "GLStruct.h"
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#include "SoftwareRasterizer.h"
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#include "Tex/NameAllocator.h"
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#include "Tex/Texture.h"
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#include "Tex/TextureUnit.h"
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#include <AK/HashMap.h>
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#include <AK/Optional.h>
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#include <AK/RefPtr.h>
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#include <AK/Tuple.h>
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#include <AK/Variant.h>
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#include <AK/Vector.h>
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#include <LibGL/GLContext.h>
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#include <LibGL/GLStruct.h>
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#include <LibGL/Tex/NameAllocator.h>
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#include <LibGL/Tex/Texture.h>
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#include <LibGL/Tex/TextureUnit.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Matrix4x4.h>
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#include <LibGfx/Rect.h>
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#include <LibGfx/Vector3.h>
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#include <LibSoftGPU/Clipper.h>
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#include <LibSoftGPU/SoftwareRasterizer.h>
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namespace GL {
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@ -229,7 +229,7 @@ private:
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NonnullRefPtr<Gfx::Bitmap> m_frontbuffer;
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Clipper m_clipper;
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SoftGPU::Clipper m_clipper;
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// Texture objects
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TextureNameAllocator m_name_allocator;
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@ -238,7 +238,7 @@ private:
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TextureUnit* m_active_texture_unit { &m_texture_units[0] };
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TextureUnit::BoundList m_bound_texture_units;
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SoftwareRasterizer m_rasterizer;
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SoftGPU::SoftwareRasterizer m_rasterizer;
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struct Listing {
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@ -1,650 +0,0 @@
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/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "SoftwareRasterizer.h"
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#include <AK/Function.h>
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#include <LibGfx/Painter.h>
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#include <LibGfx/Vector2.h>
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#include <LibGfx/Vector3.h>
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namespace GL {
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using IntVector2 = Gfx::Vector2<int>;
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using IntVector3 = Gfx::Vector3<int>;
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static constexpr int RASTERIZER_BLOCK_SIZE = 8;
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constexpr static int edge_function(const IntVector2& a, const IntVector2& b, const IntVector2& c)
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{
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return ((c.x() - a.x()) * (b.y() - a.y()) - (c.y() - a.y()) * (b.x() - a.x()));
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}
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template<typename T>
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constexpr static T interpolate(const T& v0, const T& v1, const T& v2, const FloatVector3& barycentric_coords)
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{
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return v0 * barycentric_coords.x() + v1 * barycentric_coords.y() + v2 * barycentric_coords.z();
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}
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template<typename T>
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constexpr static T mix(const T& x, const T& y, float interp)
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{
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return x * (1 - interp) + y * interp;
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}
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ALWAYS_INLINE constexpr static Gfx::RGBA32 to_rgba32(const FloatVector4& v)
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{
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auto clamped = v.clamped(0, 1);
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u8 r = clamped.x() * 255;
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u8 g = clamped.y() * 255;
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u8 b = clamped.z() * 255;
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u8 a = clamped.w() * 255;
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return a << 24 | r << 16 | g << 8 | b;
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}
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static FloatVector4 to_vec4(Gfx::RGBA32 rgba)
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{
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return {
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((rgba >> 16) & 0xff) / 255.0f,
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((rgba >> 8) & 0xff) / 255.0f,
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(rgba & 0xff) / 255.0f,
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((rgba >> 24) & 0xff) / 255.0f
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};
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}
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static Gfx::IntRect scissor_box_to_window_coordinates(Gfx::IntRect const& scissor_box, Gfx::IntRect const& window_rect)
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{
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return scissor_box.translated(0, window_rect.height() - 2 * scissor_box.y() - scissor_box.height());
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}
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static constexpr void setup_blend_factors(GLenum mode, FloatVector4& constant, float& src_alpha, float& dst_alpha, float& src_color, float& dst_color)
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{
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constant = { 0.0f, 0.0f, 0.0f, 0.0f };
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src_alpha = 0;
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dst_alpha = 0;
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src_color = 0;
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dst_color = 0;
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switch (mode) {
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case GL_ZERO:
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break;
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case GL_ONE:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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break;
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case GL_SRC_COLOR:
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src_color = 1;
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break;
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case GL_ONE_MINUS_SRC_COLOR:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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src_color = -1;
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break;
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case GL_SRC_ALPHA:
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src_alpha = 1;
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break;
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case GL_ONE_MINUS_SRC_ALPHA:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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src_alpha = -1;
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break;
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case GL_DST_ALPHA:
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dst_alpha = 1;
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break;
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case GL_ONE_MINUS_DST_ALPHA:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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dst_alpha = -1;
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break;
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case GL_DST_COLOR:
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dst_color = 1;
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break;
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case GL_ONE_MINUS_DST_COLOR:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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dst_color = -1;
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break;
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case GL_SRC_ALPHA_SATURATE:
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// FIXME: How do we implement this?
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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template<typename PS>
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static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& render_target, DepthBuffer& depth_buffer, const GLTriangle& triangle, PS pixel_shader)
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{
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// Since the algorithm is based on blocks of uniform size, we need
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// to ensure that our render_target size is actually a multiple of the block size
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VERIFY((render_target.width() % RASTERIZER_BLOCK_SIZE) == 0);
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VERIFY((render_target.height() % RASTERIZER_BLOCK_SIZE) == 0);
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// Calculate area of the triangle for later tests
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IntVector2 v0 { (int)triangle.vertices[0].position.x(), (int)triangle.vertices[0].position.y() };
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IntVector2 v1 { (int)triangle.vertices[1].position.x(), (int)triangle.vertices[1].position.y() };
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IntVector2 v2 { (int)triangle.vertices[2].position.x(), (int)triangle.vertices[2].position.y() };
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int area = edge_function(v0, v1, v2);
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if (area == 0)
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return;
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float one_over_area = 1.0f / area;
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FloatVector4 src_constant {};
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float src_factor_src_alpha = 0;
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float src_factor_dst_alpha = 0;
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float src_factor_src_color = 0;
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float src_factor_dst_color = 0;
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FloatVector4 dst_constant {};
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float dst_factor_src_alpha = 0;
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float dst_factor_dst_alpha = 0;
|
||||
float dst_factor_src_color = 0;
|
||||
float dst_factor_dst_color = 0;
|
||||
|
||||
if (options.enable_blending) {
|
||||
setup_blend_factors(
|
||||
options.blend_source_factor,
|
||||
src_constant,
|
||||
src_factor_src_alpha,
|
||||
src_factor_dst_alpha,
|
||||
src_factor_src_color,
|
||||
src_factor_dst_color);
|
||||
|
||||
setup_blend_factors(
|
||||
options.blend_destination_factor,
|
||||
dst_constant,
|
||||
dst_factor_src_alpha,
|
||||
dst_factor_dst_alpha,
|
||||
dst_factor_src_color,
|
||||
dst_factor_dst_color);
|
||||
}
|
||||
|
||||
// Obey top-left rule:
|
||||
// This sets up "zero" for later pixel coverage tests.
|
||||
// Depending on where on the triangle the edge is located
|
||||
// it is either tested against 0 or 1, effectively
|
||||
// turning "< 0" into "<= 0"
|
||||
IntVector3 zero { 1, 1, 1 };
|
||||
if (v1.y() > v0.y() || (v1.y() == v0.y() && v1.x() < v0.x()))
|
||||
zero.set_z(0);
|
||||
if (v2.y() > v1.y() || (v2.y() == v1.y() && v2.x() < v1.x()))
|
||||
zero.set_x(0);
|
||||
if (v0.y() > v2.y() || (v0.y() == v2.y() && v0.x() < v2.x()))
|
||||
zero.set_y(0);
|
||||
|
||||
// This function calculates the 3 edge values for the pixel relative to the triangle.
|
||||
auto calculate_edge_values = [v0, v1, v2](const IntVector2& p) -> IntVector3 {
|
||||
return {
|
||||
edge_function(v1, v2, p),
|
||||
edge_function(v2, v0, p),
|
||||
edge_function(v0, v1, p),
|
||||
};
|
||||
};
|
||||
|
||||
// This function tests whether a point as identified by its 3 edge values lies within the triangle
|
||||
auto test_point = [zero](const IntVector3& edges) -> bool {
|
||||
return edges.x() >= zero.x()
|
||||
&& edges.y() >= zero.y()
|
||||
&& edges.z() >= zero.z();
|
||||
};
|
||||
|
||||
// Calculate block-based bounds
|
||||
auto render_bounds = render_target.rect();
|
||||
if (options.scissor_enabled)
|
||||
render_bounds.intersect(scissor_box_to_window_coordinates(options.scissor_box, render_target.rect()));
|
||||
int const block_padding = RASTERIZER_BLOCK_SIZE - 1;
|
||||
// clang-format off
|
||||
int const bx0 = max(render_bounds.left(), min(min(v0.x(), v1.x()), v2.x())) / RASTERIZER_BLOCK_SIZE;
|
||||
int const bx1 = (min(render_bounds.right(), max(max(v0.x(), v1.x()), v2.x())) + block_padding) / RASTERIZER_BLOCK_SIZE;
|
||||
int const by0 = max(render_bounds.top(), min(min(v0.y(), v1.y()), v2.y())) / RASTERIZER_BLOCK_SIZE;
|
||||
int const by1 = (min(render_bounds.bottom(), max(max(v0.y(), v1.y()), v2.y())) + block_padding) / RASTERIZER_BLOCK_SIZE;
|
||||
// clang-format on
|
||||
|
||||
u8 pixel_mask[RASTERIZER_BLOCK_SIZE];
|
||||
static_assert(RASTERIZER_BLOCK_SIZE <= sizeof(decltype(*pixel_mask)) * 8, "RASTERIZER_BLOCK_SIZE must be smaller than the pixel_mask's width in bits");
|
||||
|
||||
FloatVector4 pixel_buffer[RASTERIZER_BLOCK_SIZE][RASTERIZER_BLOCK_SIZE];
|
||||
|
||||
// FIXME: implement stencil testing
|
||||
|
||||
// Iterate over all blocks within the bounds of the triangle
|
||||
for (int by = by0; by < by1; by++) {
|
||||
for (int bx = bx0; bx < bx1; bx++) {
|
||||
|
||||
// Edge values of the 4 block corners
|
||||
// clang-format off
|
||||
auto b0 = calculate_edge_values({ bx * RASTERIZER_BLOCK_SIZE, by * RASTERIZER_BLOCK_SIZE });
|
||||
auto b1 = calculate_edge_values({ bx * RASTERIZER_BLOCK_SIZE + RASTERIZER_BLOCK_SIZE, by * RASTERIZER_BLOCK_SIZE });
|
||||
auto b2 = calculate_edge_values({ bx * RASTERIZER_BLOCK_SIZE, by * RASTERIZER_BLOCK_SIZE + RASTERIZER_BLOCK_SIZE });
|
||||
auto b3 = calculate_edge_values({ bx * RASTERIZER_BLOCK_SIZE + RASTERIZER_BLOCK_SIZE, by * RASTERIZER_BLOCK_SIZE + RASTERIZER_BLOCK_SIZE });
|
||||
// clang-format on
|
||||
|
||||
// If the whole block is outside any of the triangle edges we can discard it completely
|
||||
// We test this by and'ing the relevant edge function values together for all block corners
|
||||
// and checking if the negative sign bit is set for all of them
|
||||
if ((b0.x() & b1.x() & b2.x() & b3.x()) & 0x80000000)
|
||||
continue;
|
||||
|
||||
if ((b0.y() & b1.y() & b2.y() & b3.y()) & 0x80000000)
|
||||
continue;
|
||||
|
||||
if ((b0.z() & b1.z() & b2.z() & b3.z()) & 0x80000000)
|
||||
continue;
|
||||
|
||||
// edge value derivatives
|
||||
auto dbdx = (b1 - b0) / RASTERIZER_BLOCK_SIZE;
|
||||
auto dbdy = (b2 - b0) / RASTERIZER_BLOCK_SIZE;
|
||||
// step edge value after each horizontal span: 1 down, BLOCK_SIZE left
|
||||
auto step_y = dbdy - dbdx * RASTERIZER_BLOCK_SIZE;
|
||||
|
||||
int x0 = bx * RASTERIZER_BLOCK_SIZE;
|
||||
int y0 = by * RASTERIZER_BLOCK_SIZE;
|
||||
|
||||
// Generate the coverage mask
|
||||
if (!options.scissor_enabled && test_point(b0) && test_point(b1) && test_point(b2) && test_point(b3)) {
|
||||
// The block is fully contained within the triangle. Fill the mask with all 1s
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++)
|
||||
pixel_mask[y] = -1;
|
||||
} else {
|
||||
// The block overlaps at least one triangle edge.
|
||||
// We need to test coverage of every pixel within the block.
|
||||
auto coords = b0;
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++, coords += step_y) {
|
||||
pixel_mask[y] = 0;
|
||||
|
||||
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, coords += dbdx) {
|
||||
if (test_point(coords) && (!options.scissor_enabled || render_bounds.contains(x0 + x, y0 + y)))
|
||||
pixel_mask[y] |= 1 << x;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// AND the depth mask onto the coverage mask
|
||||
if (options.enable_depth_test) {
|
||||
int z_pass_count = 0;
|
||||
auto coords = b0;
|
||||
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++, coords += step_y) {
|
||||
if (pixel_mask[y] == 0) {
|
||||
coords += dbdx * RASTERIZER_BLOCK_SIZE;
|
||||
continue;
|
||||
}
|
||||
|
||||
auto* depth = &depth_buffer.scanline(y0 + y)[x0];
|
||||
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, coords += dbdx, depth++) {
|
||||
if (~pixel_mask[y] & (1 << x))
|
||||
continue;
|
||||
|
||||
auto barycentric = FloatVector3(coords.x(), coords.y(), coords.z()) * one_over_area;
|
||||
float z = interpolate(triangle.vertices[0].position.z(), triangle.vertices[1].position.z(), triangle.vertices[2].position.z(), barycentric);
|
||||
|
||||
z = options.depth_min + (options.depth_max - options.depth_min) * (z + 1) / 2;
|
||||
|
||||
// FIXME: Also apply depth_offset_factor which depends on the depth gradient
|
||||
z += options.depth_offset_constant * NumericLimits<float>::epsilon();
|
||||
|
||||
bool pass = false;
|
||||
switch (options.depth_func) {
|
||||
case GL_ALWAYS:
|
||||
pass = true;
|
||||
break;
|
||||
case GL_NEVER:
|
||||
pass = false;
|
||||
break;
|
||||
case GL_GREATER:
|
||||
pass = z > *depth;
|
||||
break;
|
||||
case GL_GEQUAL:
|
||||
pass = z >= *depth;
|
||||
break;
|
||||
case GL_NOTEQUAL:
|
||||
#ifdef __SSE__
|
||||
pass = z != *depth;
|
||||
#else
|
||||
pass = bit_cast<u32>(z) != bit_cast<u32>(*depth);
|
||||
#endif
|
||||
break;
|
||||
case GL_EQUAL:
|
||||
#ifdef __SSE__
|
||||
pass = z == *depth;
|
||||
#else
|
||||
//
|
||||
// This is an interesting quirk that occurs due to us using the x87 FPU when Serenity is
|
||||
// compiled for the i386 target. When we calculate our depth value to be stored in the buffer,
|
||||
// it is an 80-bit x87 floating point number, however, when stored into the DepthBuffer, this is
|
||||
// truncated to 32 bits. This 38 bit loss of precision means that when x87 `FCOMP` is eventually
|
||||
// used here the comparison fails.
|
||||
// This could be solved by using a `long double` for the depth buffer, however this would take
|
||||
// up significantly more space and is completely overkill for a depth buffer. As such, comparing
|
||||
// the first 32-bits of this depth value is "good enough" that if we get a hit on it being
|
||||
// equal, we can pretty much guarantee that it's actually equal.
|
||||
//
|
||||
pass = bit_cast<u32>(z) == bit_cast<u32>(*depth);
|
||||
#endif
|
||||
break;
|
||||
case GL_LEQUAL:
|
||||
pass = z <= *depth;
|
||||
break;
|
||||
case GL_LESS:
|
||||
pass = z < *depth;
|
||||
break;
|
||||
}
|
||||
|
||||
if (!pass) {
|
||||
pixel_mask[y] ^= 1 << x;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (options.enable_depth_write)
|
||||
*depth = z;
|
||||
|
||||
z_pass_count++;
|
||||
}
|
||||
}
|
||||
|
||||
// Nice, no pixels passed the depth test -> block rejected by early z
|
||||
if (z_pass_count == 0)
|
||||
continue;
|
||||
}
|
||||
|
||||
// We will not update the color buffer at all
|
||||
if (!options.color_mask || options.draw_buffer == GL_NONE)
|
||||
continue;
|
||||
|
||||
// Draw the pixels according to the previously generated mask
|
||||
auto coords = b0;
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++, coords += step_y) {
|
||||
if (pixel_mask[y] == 0) {
|
||||
coords += dbdx * RASTERIZER_BLOCK_SIZE;
|
||||
continue;
|
||||
}
|
||||
|
||||
auto* pixel = pixel_buffer[y];
|
||||
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, coords += dbdx, pixel++) {
|
||||
if (~pixel_mask[y] & (1 << x))
|
||||
continue;
|
||||
|
||||
// Perspective correct barycentric coordinates
|
||||
auto barycentric = FloatVector3(coords.x(), coords.y(), coords.z()) * one_over_area;
|
||||
float interpolated_reciprocal_w = interpolate(triangle.vertices[0].position.w(), triangle.vertices[1].position.w(), triangle.vertices[2].position.w(), barycentric);
|
||||
float interpolated_w = 1 / interpolated_reciprocal_w;
|
||||
barycentric = barycentric * FloatVector3(triangle.vertices[0].position.w(), triangle.vertices[1].position.w(), triangle.vertices[2].position.w()) * interpolated_w;
|
||||
|
||||
// FIXME: make this more generic. We want to interpolate more than just color and uv
|
||||
FloatVector4 vertex_color;
|
||||
if (options.shade_smooth) {
|
||||
vertex_color = interpolate(
|
||||
triangle.vertices[0].color,
|
||||
triangle.vertices[1].color,
|
||||
triangle.vertices[2].color,
|
||||
barycentric);
|
||||
} else {
|
||||
vertex_color = triangle.vertices[0].color;
|
||||
}
|
||||
|
||||
auto uv = interpolate(
|
||||
triangle.vertices[0].tex_coord,
|
||||
triangle.vertices[1].tex_coord,
|
||||
triangle.vertices[2].tex_coord,
|
||||
barycentric);
|
||||
|
||||
// Calculate depth of fragment for fog
|
||||
float z = interpolate(triangle.vertices[0].position.z(), triangle.vertices[1].position.z(), triangle.vertices[2].position.z(), barycentric);
|
||||
z = options.depth_min + (options.depth_max - options.depth_min) * (z + 1) / 2;
|
||||
|
||||
*pixel = pixel_shader(uv, vertex_color, z);
|
||||
}
|
||||
}
|
||||
|
||||
if (options.enable_alpha_test && options.alpha_test_func != GL_ALWAYS) {
|
||||
// FIXME: I'm not sure if this is the right place to test this.
|
||||
// If we tested this right at the beginning of our rasterizer routine
|
||||
// we could skip a lot of work but the GL spec might disagree.
|
||||
if (options.alpha_test_func == GL_NEVER)
|
||||
continue;
|
||||
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {
|
||||
auto src = pixel_buffer[y];
|
||||
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, src++) {
|
||||
if (~pixel_mask[y] & (1 << x))
|
||||
continue;
|
||||
|
||||
bool passed = true;
|
||||
|
||||
switch (options.alpha_test_func) {
|
||||
case GL_LESS:
|
||||
passed = src->w() < options.alpha_test_ref_value;
|
||||
break;
|
||||
case GL_EQUAL:
|
||||
passed = src->w() == options.alpha_test_ref_value;
|
||||
break;
|
||||
case GL_LEQUAL:
|
||||
passed = src->w() <= options.alpha_test_ref_value;
|
||||
break;
|
||||
case GL_GREATER:
|
||||
passed = src->w() > options.alpha_test_ref_value;
|
||||
break;
|
||||
case GL_NOTEQUAL:
|
||||
passed = src->w() != options.alpha_test_ref_value;
|
||||
break;
|
||||
case GL_GEQUAL:
|
||||
passed = src->w() >= options.alpha_test_ref_value;
|
||||
break;
|
||||
}
|
||||
|
||||
if (!passed)
|
||||
pixel_mask[y] ^= (1 << x);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (options.enable_blending) {
|
||||
// Blend color values from pixel_buffer into render_target
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {
|
||||
auto src = pixel_buffer[y];
|
||||
auto dst = &render_target.scanline(y + y0)[x0];
|
||||
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, src++, dst++) {
|
||||
if (~pixel_mask[y] & (1 << x))
|
||||
continue;
|
||||
|
||||
auto float_dst = to_vec4(*dst);
|
||||
|
||||
auto src_factor = src_constant
|
||||
+ *src * src_factor_src_color
|
||||
+ FloatVector4(src->w(), src->w(), src->w(), src->w()) * src_factor_src_alpha
|
||||
+ float_dst * src_factor_dst_color
|
||||
+ FloatVector4(float_dst.w(), float_dst.w(), float_dst.w(), float_dst.w()) * src_factor_dst_alpha;
|
||||
|
||||
auto dst_factor = dst_constant
|
||||
+ *src * dst_factor_src_color
|
||||
+ FloatVector4(src->w(), src->w(), src->w(), src->w()) * dst_factor_src_alpha
|
||||
+ float_dst * dst_factor_dst_color
|
||||
+ FloatVector4(float_dst.w(), float_dst.w(), float_dst.w(), float_dst.w()) * dst_factor_dst_alpha;
|
||||
|
||||
*dst = (*dst & ~options.color_mask) | (to_rgba32(*src * src_factor + float_dst * dst_factor) & options.color_mask);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
// Copy color values from pixel_buffer into render_target
|
||||
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {
|
||||
auto src = pixel_buffer[y];
|
||||
auto dst = &render_target.scanline(y + y0)[x0];
|
||||
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, src++, dst++) {
|
||||
if (~pixel_mask[y] & (1 << x))
|
||||
continue;
|
||||
|
||||
*dst = (*dst & ~options.color_mask) | (to_rgba32(*src) & options.color_mask);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static Gfx::IntSize closest_multiple(const Gfx::IntSize& min_size, size_t step)
|
||||
{
|
||||
int width = ((min_size.width() + step - 1) / step) * step;
|
||||
int height = ((min_size.height() + step - 1) / step) * step;
|
||||
return { width, height };
|
||||
}
|
||||
|
||||
SoftwareRasterizer::SoftwareRasterizer(const Gfx::IntSize& min_size)
|
||||
: m_render_target { Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, closest_multiple(min_size, RASTERIZER_BLOCK_SIZE)).release_value_but_fixme_should_propagate_errors() }
|
||||
, m_depth_buffer { adopt_own(*new DepthBuffer(closest_multiple(min_size, RASTERIZER_BLOCK_SIZE))) }
|
||||
{
|
||||
m_options.scissor_box = m_render_target->rect();
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::submit_triangle(GLTriangle const& triangle, TextureUnit::BoundList const& bound_texture_units)
|
||||
{
|
||||
rasterize_triangle(m_options, *m_render_target, *m_depth_buffer, triangle, [this, &bound_texture_units](FloatVector4 const& uv, FloatVector4 const& color, float z) -> FloatVector4 {
|
||||
FloatVector4 fragment = color;
|
||||
|
||||
for (auto const& texture_unit : bound_texture_units) {
|
||||
// FIXME: implement GL_TEXTURE_1D, GL_TEXTURE_3D and GL_TEXTURE_CUBE_MAP
|
||||
FloatVector4 texel;
|
||||
switch (texture_unit.currently_bound_target()) {
|
||||
case GL_TEXTURE_2D:
|
||||
if (!texture_unit.texture_2d_enabled() || texture_unit.texture_3d_enabled() || texture_unit.texture_cube_map_enabled())
|
||||
continue;
|
||||
texel = texture_unit.bound_texture_2d()->sampler().sample(uv);
|
||||
break;
|
||||
default:
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
// FIXME: Implement more blend modes
|
||||
switch (texture_unit.env_mode()) {
|
||||
case GL_MODULATE:
|
||||
default:
|
||||
fragment = fragment * texel;
|
||||
break;
|
||||
case GL_REPLACE:
|
||||
fragment = texel;
|
||||
break;
|
||||
case GL_DECAL: {
|
||||
float src_alpha = fragment.w();
|
||||
float one_minus_src_alpha = 1 - src_alpha;
|
||||
fragment.set_x(texel.x() * src_alpha + fragment.x() * one_minus_src_alpha);
|
||||
fragment.set_y(texel.y() * src_alpha + fragment.y() * one_minus_src_alpha);
|
||||
fragment.set_z(texel.z() * src_alpha + fragment.z() * one_minus_src_alpha);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Calculate fog
|
||||
// Math from here: https://opengl-notes.readthedocs.io/en/latest/topics/texturing/aliasing.html
|
||||
if (m_options.fog_enabled) {
|
||||
float factor = 0.0f;
|
||||
switch (m_options.fog_mode) {
|
||||
case GL_LINEAR:
|
||||
factor = (m_options.fog_end - z) / (m_options.fog_end - m_options.fog_start);
|
||||
break;
|
||||
case GL_EXP:
|
||||
factor = exp(-((m_options.fog_density * z)));
|
||||
break;
|
||||
case GL_EXP2:
|
||||
factor = exp(-((m_options.fog_density * z) * (m_options.fog_density * z)));
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
// Mix texel with fog
|
||||
fragment = mix(m_options.fog_color, fragment, factor);
|
||||
}
|
||||
|
||||
return fragment;
|
||||
});
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::resize(const Gfx::IntSize& min_size)
|
||||
{
|
||||
wait_for_all_threads();
|
||||
|
||||
m_render_target = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, closest_multiple(min_size, RASTERIZER_BLOCK_SIZE)).release_value_but_fixme_should_propagate_errors();
|
||||
m_depth_buffer = adopt_own(*new DepthBuffer(m_render_target->size()));
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::clear_color(const FloatVector4& color)
|
||||
{
|
||||
wait_for_all_threads();
|
||||
|
||||
uint8_t r = static_cast<uint8_t>(clamp(color.x(), 0.0f, 1.0f) * 255);
|
||||
uint8_t g = static_cast<uint8_t>(clamp(color.y(), 0.0f, 1.0f) * 255);
|
||||
uint8_t b = static_cast<uint8_t>(clamp(color.z(), 0.0f, 1.0f) * 255);
|
||||
uint8_t a = static_cast<uint8_t>(clamp(color.w(), 0.0f, 1.0f) * 255);
|
||||
auto const fill_color = Gfx::Color(r, g, b, a);
|
||||
|
||||
if (m_options.scissor_enabled) {
|
||||
auto fill_rect = m_render_target->rect();
|
||||
fill_rect.intersect(scissor_box_to_window_coordinates(m_options.scissor_box, fill_rect));
|
||||
Gfx::Painter painter { *m_render_target };
|
||||
painter.fill_rect(fill_rect, fill_color);
|
||||
return;
|
||||
}
|
||||
|
||||
m_render_target->fill(fill_color);
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::clear_depth(float depth)
|
||||
{
|
||||
wait_for_all_threads();
|
||||
|
||||
if (m_options.scissor_enabled) {
|
||||
m_depth_buffer->clear(scissor_box_to_window_coordinates(m_options.scissor_box, m_render_target->rect()), depth);
|
||||
return;
|
||||
}
|
||||
|
||||
m_depth_buffer->clear(depth);
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::blit(Gfx::Bitmap const& source, int x, int y)
|
||||
{
|
||||
wait_for_all_threads();
|
||||
|
||||
Gfx::Painter painter { *m_render_target };
|
||||
painter.blit({ x, y }, source, source.rect(), 1.0f, true);
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::blit_to(Gfx::Bitmap& target)
|
||||
{
|
||||
wait_for_all_threads();
|
||||
|
||||
Gfx::Painter painter { target };
|
||||
painter.blit({ 0, 0 }, *m_render_target, m_render_target->rect(), 1.0f, false);
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::wait_for_all_threads() const
|
||||
{
|
||||
// FIXME: Wait for all render threads to finish when multithreading is being implemented
|
||||
}
|
||||
|
||||
void SoftwareRasterizer::set_options(const RasterizerOptions& options)
|
||||
{
|
||||
wait_for_all_threads();
|
||||
|
||||
m_options = options;
|
||||
|
||||
// FIXME: Recreate or reinitialize render threads here when multithreading is being implemented
|
||||
}
|
||||
|
||||
Gfx::RGBA32 SoftwareRasterizer::get_backbuffer_pixel(int x, int y)
|
||||
{
|
||||
// FIXME: Reading individual pixels is very slow, rewrite this to transfer whole blocks
|
||||
if (x < 0 || y < 0 || x >= m_render_target->width() || y >= m_render_target->height())
|
||||
return 0;
|
||||
|
||||
return m_render_target->scanline(y)[x];
|
||||
}
|
||||
|
||||
float SoftwareRasterizer::get_depthbuffer_value(int x, int y)
|
||||
{
|
||||
// FIXME: Reading individual pixels is very slow, rewrite this to transfer whole blocks
|
||||
if (x < 0 || y < 0 || x >= m_render_target->width() || y >= m_render_target->height())
|
||||
return 1.0f;
|
||||
|
||||
return m_depth_buffer->scanline(y)[x];
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -1,77 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include "DepthBuffer.h"
|
||||
#include "GL/gl.h"
|
||||
#include "GLStruct.h"
|
||||
#include "Tex/Texture2D.h"
|
||||
#include "Tex/TextureUnit.h"
|
||||
#include <AK/Array.h>
|
||||
#include <AK/OwnPtr.h>
|
||||
#include <LibGfx/Bitmap.h>
|
||||
#include <LibGfx/Rect.h>
|
||||
#include <LibGfx/Vector4.h>
|
||||
|
||||
namespace GL {
|
||||
|
||||
struct RasterizerOptions {
|
||||
bool shade_smooth { true };
|
||||
bool enable_depth_test { false };
|
||||
bool enable_depth_write { true };
|
||||
bool enable_alpha_test { false };
|
||||
GLenum alpha_test_func { GL_ALWAYS };
|
||||
float alpha_test_ref_value { 0 };
|
||||
bool enable_blending { false };
|
||||
GLenum blend_source_factor { GL_ONE };
|
||||
GLenum blend_destination_factor { GL_ONE };
|
||||
u32 color_mask { 0xffffffff };
|
||||
float depth_min { 0 };
|
||||
float depth_max { 1 };
|
||||
GLenum depth_func { GL_LESS };
|
||||
GLenum polygon_mode { GL_FILL };
|
||||
FloatVector4 fog_color {
|
||||
0.0f,
|
||||
0.0f,
|
||||
0.0f,
|
||||
0.0f,
|
||||
};
|
||||
GLfloat fog_density { 1.0f };
|
||||
GLenum fog_mode { GL_EXP };
|
||||
GLboolean fog_enabled { false };
|
||||
GLfloat fog_start { 0.0f };
|
||||
GLfloat fog_end { 1.0f };
|
||||
bool scissor_enabled { false };
|
||||
Gfx::IntRect scissor_box;
|
||||
GLenum draw_buffer { GL_BACK };
|
||||
GLfloat depth_offset_factor { 0 };
|
||||
GLfloat depth_offset_constant { 0 };
|
||||
};
|
||||
|
||||
class SoftwareRasterizer final {
|
||||
public:
|
||||
SoftwareRasterizer(const Gfx::IntSize& min_size);
|
||||
|
||||
void submit_triangle(GLTriangle const& triangle, TextureUnit::BoundList const& bound_texture_units);
|
||||
void resize(const Gfx::IntSize& min_size);
|
||||
void clear_color(const FloatVector4&);
|
||||
void clear_depth(float);
|
||||
void blit(Gfx::Bitmap const&, int x, int y);
|
||||
void blit_to(Gfx::Bitmap&);
|
||||
void wait_for_all_threads() const;
|
||||
void set_options(const RasterizerOptions&);
|
||||
RasterizerOptions options() const { return m_options; }
|
||||
Gfx::RGBA32 get_backbuffer_pixel(int x, int y);
|
||||
float get_depthbuffer_value(int x, int y);
|
||||
|
||||
private:
|
||||
RefPtr<Gfx::Bitmap> m_render_target;
|
||||
OwnPtr<DepthBuffer> m_depth_buffer;
|
||||
RasterizerOptions m_options;
|
||||
};
|
||||
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue