krzosa/software_rasterizer
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Premultiplied alpha and linear to srgb W_I_D_E

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Krzosa Karol
2022-07-04 16:51:18 +02:00
parent f9da64a6c9
commit 6f1b5ae933
1 changed files with 15 additions and 14 deletions
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29
main.cpp
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@@ -463,6 +463,21 @@ void draw_triangle_nearest(Bitmap* dst, F32 *depth_buffer, Bitmap *src, Vec3 lig
dst_g *= dst_g; dst_g *= dst_g;
dst_b *= dst_b; dst_b *= dst_b;
// Premultiplied alpha
{
texel_r = texel_r + ((vec8(1)-texel_a) * dst_r);
texel_g = texel_g + ((vec8(1)-texel_a) * dst_g);
texel_b = texel_b + ((vec8(1)-texel_a) * dst_b);
texel_a = texel_a + dst_a - texel_a*dst_a;
}
// Almost linear to srgb
{
texel_r.simd = {_mm256_sqrt_ps(texel_r.simd)};
texel_g.simd = {_mm256_sqrt_ps(texel_g.simd)};
texel_b.simd = {_mm256_sqrt_ps(texel_b.simd)};
}
for(S64 i = 0; i < 8; i++){ for(S64 i = 0; i < 8; i++){
if (should_fill[i]){ if (should_fill[i]){
Vec4 result_color = {texel_r[i], texel_g[i], texel_b[i], texel_a[i]}; Vec4 result_color = {texel_r[i], texel_g[i], texel_b[i], texel_a[i]};
@@ -477,20 +492,6 @@ void draw_triangle_nearest(Bitmap* dst, F32 *depth_buffer, Bitmap *src, Vec3 lig
} }
#endif #endif
// Premultiplied alpha
{
result_color.r = result_color.r + ((1-result_color.a) * dst_color.r);
result_color.g = result_color.g + ((1-result_color.a) * dst_color.g);
result_color.b = result_color.b + ((1-result_color.a) * dst_color.b);
result_color.a = result_color.a + dst_color.a - result_color.a*dst_color.a;
}
// Almost linear to srgb
{
result_color.r = sqrtf(result_color.r);
result_color.g = sqrtf(result_color.g);
result_color.b = sqrtf(result_color.b);
}
U32 color32; U32 color32;
{ {