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LibGL+LibGPU+LibSoftGPU: Implement constant blending color

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Available since OpenGL 2.0, calling `glBlendColor` allows you to set a
constant color to be used as a blend factor.
This commit is contained in:
Jelle Raaijmakers 2024-04-09 23:09:04 +02:00 • committed by Tim Schumacher
commit 2831e68999
Notes: sideshowbarker 2024-07-17 01:12:07 +09:00
6 changed files with 71 additions and 24 deletions
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53
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -137,37 +137,50 @@ ALWAYS_INLINE static void test_alpha(PixelQuad& quad, GPU::AlphaTestFunction alp
ALWAYS_INLINE static bool is_blend_factor_constant(GPU::BlendFactor blend_factor)
{
return (blend_factor == GPU::BlendFactor::One || blend_factor == GPU::BlendFactor::Zero);
return blend_factor == GPU::BlendFactor::Zero
|| blend_factor == GPU::BlendFactor::One
|| blend_factor == GPU::BlendFactor::ConstantColor
|| blend_factor == GPU::BlendFactor::OneMinusConstantColor
|| blend_factor == GPU::BlendFactor::ConstantAlpha
|| blend_factor == GPU::BlendFactor::OneMinusConstantAlpha;
}
// OpenGL 2.0 § 4.1.8, table 4.2
ALWAYS_INLINE static Vector4<f32x4> get_blend_factor(GPU::BlendFactor blend_factor, Vector4<f32x4> const& source_color, Vector4<f32x4> const& destination_color)
ALWAYS_INLINE static Vector4<f32x4> get_blend_factor(GPU::BlendFactor blend_factor, FloatVector4 blend_color, Vector4<f32x4> const& source_color, Vector4<f32x4> const& destination_color)
{
switch (blend_factor) {
case GPU::BlendFactor::DstAlpha:
return to_vec4(destination_color.w());
case GPU::BlendFactor::DstColor:
return destination_color;
case GPU::BlendFactor::Zero:
return to_vec4(expand4(0.f));
case GPU::BlendFactor::One:
return to_vec4(expand4(1.f));
case GPU::BlendFactor::OneMinusDstAlpha:
return to_vec4(1.f - destination_color.w());
case GPU::BlendFactor::OneMinusDstColor:
return to_vec4(expand4(1.f)) - destination_color;
case GPU::BlendFactor::OneMinusSrcAlpha:
return to_vec4(1.f - source_color.w());
case GPU::BlendFactor::SrcColor:
return source_color;
case GPU::BlendFactor::OneMinusSrcColor:
return to_vec4(expand4(1.f)) - source_color;
case GPU::BlendFactor::DstColor:
return destination_color;
case GPU::BlendFactor::OneMinusDstColor:
return to_vec4(expand4(1.f)) - destination_color;
case GPU::BlendFactor::SrcAlpha:
return to_vec4(source_color.w());
case GPU::BlendFactor::OneMinusSrcAlpha:
return to_vec4(1.f - source_color.w());
case GPU::BlendFactor::DstAlpha:
return to_vec4(destination_color.w());
case GPU::BlendFactor::OneMinusDstAlpha:
return to_vec4(1.f - destination_color.w());
case GPU::BlendFactor::ConstantColor:
return expand4(blend_color);
case GPU::BlendFactor::OneMinusConstantColor:
return expand4(FloatVector4 { 1.f, 1.f, 1.f, 1.f } - blend_color);
case GPU::BlendFactor::ConstantAlpha:
return to_vec4(expand4(blend_color.w()));
case GPU::BlendFactor::OneMinusConstantAlpha:
return to_vec4(expand4(1.f - blend_color.w()));
case GPU::BlendFactor::SrcAlphaSaturate: {
auto saturated = min(source_color.w(), 1.f - destination_color.w());
return { saturated, saturated, saturated, expand4(1.f) };
}
case GPU::BlendFactor::SrcColor:
return source_color;
case GPU::BlendFactor::Zero:
return to_vec4(expand4(0.f));
default:
VERIFY_NOT_REACHED();
}
@ -282,9 +295,9 @@ ALWAYS_INLINE void Device::rasterize(Gfx::IntRect& render_bounds, CB1 set_covera
auto const destination_weights_are_constant = is_blend_factor_constant(m_options.blend_destination_factor);
if (m_options.enable_blending) {
if (source_weights_are_constant)
source_weights = get_blend_factor(m_options.blend_source_factor, {}, {});
source_weights = get_blend_factor(m_options.blend_source_factor, m_options.blend_color, {}, {});
if (destination_weights_are_constant)
destination_weights = get_blend_factor(m_options.blend_destination_factor, {}, {});
destination_weights = get_blend_factor(m_options.blend_destination_factor, m_options.blend_color, {}, {});
}
// Rasterize all quads
@ -480,9 +493,9 @@ ALWAYS_INLINE void Device::rasterize(Gfx::IntRect& render_bounds, CB1 set_covera
auto const destination_color = to_vec4(dst_u32);
if (!source_weights_are_constant)
source_weights = get_blend_factor(m_options.blend_source_factor, source_color, destination_color);
source_weights = get_blend_factor(m_options.blend_source_factor, m_options.blend_color, source_color, destination_color);
if (!destination_weights_are_constant)
destination_weights = get_blend_factor(m_options.blend_destination_factor, source_color, destination_color);
destination_weights = get_blend_factor(m_options.blend_destination_factor, m_options.blend_color, source_color, destination_color);
out_color = blend_colors(m_options.blend_equation_rgb, m_options.blend_equation_alpha, source_color, source_weights, destination_color, destination_weights);
}