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https://github.com/RGBCube/serenity
synced 2025-07-27 14:57:35 +00:00
LibSoftGPU: Move alpha blend factor setup out of triangle rasterization
Since the alpha blend configuration should not change between most calls of draw_primitives it makes no sense to reinitialize the blend factors for every rasterized triangle. The alpha blend factors are now set up whenever the device config changes. The blend factors are stored in struct AlphaBlendFactors.
This commit is contained in:
Stephan Unverwerth
Ali Mohammad Pur
parent
b4a18eaaf0
commit
68a1727547
3 changed files with 107 additions and 61 deletions
27
Userland/Libraries/LibSoftGPU/AlphaBlendFactors.h
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27
Userland/Libraries/LibSoftGPU/AlphaBlendFactors.h
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@ -0,0 +1,27 @@
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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/Vector4.h>
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namespace SoftGPU {
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struct AlphaBlendFactors final {
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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;
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float dst_factor_src_color = 0;
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float dst_factor_dst_color = 0;
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};
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}
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@ -85,51 +85,94 @@ static Gfx::IntRect scissor_box_to_window_coordinates(Gfx::IntRect const& scisso
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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(BlendFactor mode, FloatVector4& constant, float& src_alpha, float& dst_alpha, float& src_color, float& dst_color)
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void Device::setup_blend_factors()
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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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m_alpha_blend_factors.src_constant = { 0.0f, 0.0f, 0.0f, 0.0f };
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m_alpha_blend_factors.src_factor_src_alpha = 0;
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m_alpha_blend_factors.src_factor_dst_alpha = 0;
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m_alpha_blend_factors.src_factor_src_color = 0;
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m_alpha_blend_factors.src_factor_dst_color = 0;
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switch (mode) {
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switch (m_options.blend_source_factor) {
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case BlendFactor::Zero:
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break;
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case BlendFactor::One:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.src_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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break;
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case BlendFactor::SrcColor:
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src_color = 1;
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m_alpha_blend_factors.src_factor_src_color = 1;
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break;
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case BlendFactor::OneMinusSrcColor:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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src_color = -1;
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m_alpha_blend_factors.src_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.src_factor_src_color = -1;
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break;
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case BlendFactor::SrcAlpha:
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src_alpha = 1;
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m_alpha_blend_factors.src_factor_src_alpha = 1;
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break;
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case BlendFactor::OneMinusSrcAlpha:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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src_alpha = -1;
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m_alpha_blend_factors.src_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.src_factor_src_alpha = -1;
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break;
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case BlendFactor::DstAlpha:
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dst_alpha = 1;
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m_alpha_blend_factors.src_factor_dst_alpha = 1;
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break;
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case BlendFactor::OneMinusDstAlpha:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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dst_alpha = -1;
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m_alpha_blend_factors.src_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.src_factor_dst_alpha = -1;
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break;
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case BlendFactor::DstColor:
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dst_color = 1;
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m_alpha_blend_factors.src_factor_dst_color = 1;
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break;
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case BlendFactor::OneMinusDstColor:
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constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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dst_color = -1;
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m_alpha_blend_factors.src_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.src_factor_dst_color = -1;
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break;
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case BlendFactor::SrcAlphaSaturate:
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// FIXME: How do we implement this?
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default:
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VERIFY_NOT_REACHED();
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}
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m_alpha_blend_factors.dst_constant = { 0.0f, 0.0f, 0.0f, 0.0f };
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m_alpha_blend_factors.dst_factor_src_alpha = 0;
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m_alpha_blend_factors.dst_factor_dst_alpha = 0;
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m_alpha_blend_factors.dst_factor_src_color = 0;
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m_alpha_blend_factors.dst_factor_dst_color = 0;
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switch (m_options.blend_destination_factor) {
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case BlendFactor::Zero:
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break;
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case BlendFactor::One:
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m_alpha_blend_factors.dst_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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break;
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case BlendFactor::SrcColor:
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m_alpha_blend_factors.dst_factor_src_color = 1;
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break;
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case BlendFactor::OneMinusSrcColor:
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m_alpha_blend_factors.dst_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.dst_factor_src_color = -1;
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break;
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case BlendFactor::SrcAlpha:
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m_alpha_blend_factors.dst_factor_src_alpha = 1;
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break;
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case BlendFactor::OneMinusSrcAlpha:
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m_alpha_blend_factors.dst_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.dst_factor_src_alpha = -1;
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break;
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case BlendFactor::DstAlpha:
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m_alpha_blend_factors.dst_factor_dst_alpha = 1;
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break;
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case BlendFactor::OneMinusDstAlpha:
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m_alpha_blend_factors.dst_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.dst_factor_dst_alpha = -1;
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break;
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case BlendFactor::DstColor:
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m_alpha_blend_factors.dst_factor_dst_color = 1;
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break;
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case BlendFactor::OneMinusDstColor:
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m_alpha_blend_factors.dst_constant = { 1.0f, 1.0f, 1.0f, 1.0f };
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m_alpha_blend_factors.dst_factor_dst_color = -1;
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break;
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case BlendFactor::SrcAlphaSaturate:
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default:
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VERIFY_NOT_REACHED();
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}
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@ -166,36 +209,6 @@ void Device::rasterize_triangle(const Triangle& triangle)
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auto const 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;
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float dst_factor_src_color = 0;
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float dst_factor_dst_color = 0;
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if (m_options.enable_blending) {
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setup_blend_factors(
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m_options.blend_source_factor,
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src_constant,
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src_factor_src_alpha,
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src_factor_dst_alpha,
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src_factor_src_color,
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src_factor_dst_color);
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setup_blend_factors(
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m_options.blend_destination_factor,
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dst_constant,
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dst_factor_src_alpha,
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dst_factor_dst_alpha,
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dst_factor_src_color,
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dst_factor_dst_color);
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}
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auto render_bounds = m_render_target->rect();
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auto window_scissor_rect = scissor_box_to_window_coordinates(m_options.scissor_box, m_render_target->rect());
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if (m_options.scissor_enabled)
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@ -441,17 +454,17 @@ void Device::rasterize_triangle(const Triangle& triangle)
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Vector4<f32x4> const& src = quad.out_color;
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auto dst = to_vec4(dst_u32);
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auto src_factor = expand4(src_constant)
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+ src * src_factor_src_color
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+ Vector4<f32x4> { src.w(), src.w(), src.w(), src.w() } * src_factor_src_alpha
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+ dst * src_factor_dst_color
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+ Vector4<f32x4> { dst.w(), dst.w(), dst.w(), dst.w() } * src_factor_dst_alpha;
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auto src_factor = expand4(m_alpha_blend_factors.src_constant)
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+ src * m_alpha_blend_factors.src_factor_src_color
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+ Vector4<f32x4> { src.w(), src.w(), src.w(), src.w() } * m_alpha_blend_factors.src_factor_src_alpha
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+ dst * m_alpha_blend_factors.src_factor_dst_color
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+ Vector4<f32x4> { dst.w(), dst.w(), dst.w(), dst.w() } * m_alpha_blend_factors.src_factor_dst_alpha;
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auto dst_factor = expand4(dst_constant)
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+ src * dst_factor_src_color
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+ Vector4<f32x4> { src.w(), src.w(), src.w(), src.w() } * dst_factor_src_alpha
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+ dst * dst_factor_dst_color
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+ Vector4<f32x4> { dst.w(), dst.w(), dst.w(), dst.w() } * dst_factor_dst_alpha;
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auto dst_factor = expand4(m_alpha_blend_factors.dst_constant)
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+ src * m_alpha_blend_factors.dst_factor_src_color
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+ Vector4<f32x4> { src.w(), src.w(), src.w(), src.w() } * m_alpha_blend_factors.dst_factor_src_alpha
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+ dst * m_alpha_blend_factors.dst_factor_dst_color
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+ Vector4<f32x4> { dst.w(), dst.w(), dst.w(), dst.w() } * m_alpha_blend_factors.dst_factor_dst_alpha;
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quad.out_color = src * src_factor + dst * dst_factor;
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}
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@ -936,6 +949,9 @@ void Device::set_options(const RasterizerOptions& options)
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m_options = options;
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if (m_options.enable_blending)
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setup_blend_factors();
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// FIXME: Recreate or reinitialize render threads here when multithreading is being implemented
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}
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@ -14,6 +14,7 @@
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#include <LibGfx/Matrix4x4.h>
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#include <LibGfx/Rect.h>
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#include <LibGfx/Vector4.h>
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#include <LibSoftGPU/AlphaBlendFactors.h>
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#include <LibSoftGPU/Clipper.h>
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#include <LibSoftGPU/Config.h>
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#include <LibSoftGPU/DepthBuffer.h>
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@ -95,6 +96,7 @@ private:
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void draw_statistics_overlay(Gfx::Bitmap&);
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void rasterize_triangle(const Triangle& triangle);
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void setup_blend_factors();
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void shade_fragments(PixelQuad&);
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private:
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@ -107,6 +109,7 @@ private:
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Vector<Vertex> m_clipped_vertices;
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Array<Sampler, NUM_SAMPLERS> m_samplers;
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Vector<size_t> m_enabled_texture_units;
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AlphaBlendFactors m_alpha_blend_factors;
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};
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}
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