mirror of
https://github.com/RGBCube/serenity
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5ff248649b
This is based mostly on Fabian "ryg" Giesen's 2011 blog series "A trip through the Graphics Pipeline" and Scratchapixel's "Rasterization: a Practical Implementation". The rasterizer processes triangles in grid aligned 16x16 pixel blocks, calculates barycentric coordinates and edge derivatives and interpolates bilinearly across each block. This will theoretically allow for better utilization of modern processor features such as SMT and SIMD, as opposed to a classic scanline based triangle rasterizer. This serves as a starting point to get something on the screen. In the future we might look into properly pipelining the main loop to make the rasterizer more flexible, enabling us to enable/disable certain features at the block rather than the pixel level.
80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@gmx.de>
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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 "GLContext.h"
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#include "GLStruct.h"
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#include "SoftwareRasterizer.h"
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#include <AK/RefPtr.h>
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#include <AK/Vector.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Matrix4x4.h>
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#include <LibGfx/Vector3.h>
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namespace GL {
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class SoftwareGLContext : public GLContext {
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public:
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SoftwareGLContext(Gfx::Bitmap&);
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virtual void gl_begin(GLenum mode) override;
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virtual void gl_clear(GLbitfield mask) override;
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virtual void gl_clear_color(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha) override;
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virtual void gl_color(GLdouble r, GLdouble g, GLdouble b, GLdouble a) override;
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virtual void gl_end() override;
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virtual void gl_frustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val) override;
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virtual GLenum gl_get_error() override;
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virtual GLubyte* gl_get_string(GLenum name) override;
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virtual void gl_load_identity() override;
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virtual void gl_load_matrix(const FloatMatrix4x4& matrix) override;
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virtual void gl_matrix_mode(GLenum mode) override;
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virtual void gl_ortho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val) override;
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virtual void gl_push_matrix() override;
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virtual void gl_pop_matrix() override;
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virtual void gl_rotate(GLdouble angle, GLdouble x, GLdouble y, GLdouble z) override;
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virtual void gl_scale(GLdouble x, GLdouble y, GLdouble z) override;
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virtual void gl_translate(GLdouble x, GLdouble y, GLdouble z) override;
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virtual void gl_vertex(GLdouble x, GLdouble y, GLdouble z, GLdouble w) override;
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virtual void gl_viewport(GLint x, GLint y, GLsizei width, GLsizei height) override;
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virtual void gl_enable(GLenum) override;
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virtual void gl_disable(GLenum) override;
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virtual void gl_front_face(GLenum) override;
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virtual void gl_cull_face(GLenum) override;
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virtual void present() override;
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private:
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GLenum m_current_draw_mode;
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GLenum m_current_matrix_mode;
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FloatMatrix4x4 m_projection_matrix;
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FloatMatrix4x4 m_model_view_matrix;
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FloatMatrix4x4 m_current_matrix;
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Vector<FloatMatrix4x4> m_projection_matrix_stack;
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Vector<FloatMatrix4x4> m_model_view_matrix_stack;
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FloatVector4 m_clear_color = { 0.0f, 0.0f, 0.0f, 0.0f };
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FloatVector4 m_current_vertex_color = { 1.0f, 1.0f, 1.0f, 1.0f };
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Vector<GLVertex> vertex_list;
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Vector<GLTriangle> triangle_list;
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Vector<GLTriangle> processed_triangles;
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GLenum m_error = GL_NO_ERROR;
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bool m_in_draw_state = false;
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bool m_cull_faces = false;
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GLenum m_front_face = GL_CCW;
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GLenum m_culled_sides = GL_BACK;
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NonnullRefPtr<Gfx::Bitmap> m_frontbuffer;
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SoftwareRasterizer m_rasterizer;
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};
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}
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