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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /// Shader used for drawing a pending framebuffer onto a parent framebuffer | ||
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| struct VertexOutput { | ||
| @builtin(position) position: vec4<f32>, | ||
| @location(0) uv: vec2<f32>, | ||
| }; | ||
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| struct BlendOptions { | ||
| mode: i32, | ||
| _padding1: f32, | ||
| _padding2: f32, | ||
| _padding3: f32, | ||
| } | ||
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| @group(2) @binding(0) var parent_texture: texture_2d<f32>; | ||
| @group(2) @binding(1) var current_texture: texture_2d<f32>; | ||
| @group(2) @binding(2) var texture_sampler: sampler; | ||
| @group(2) @binding(3) var<uniform> blend: BlendOptions; | ||
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| @vertex | ||
| fn main_vertex(in: VertexInput) -> VertexOutput { | ||
| let pos = globals.view_matrix * transforms.world_matrix * vec4<f32>(in.position.x, in.position.y, 1.0, 1.0); | ||
| let uv = vec2<f32>((pos.x + 1.0) / 2.0, -((pos.y - 1.0) / 2.0)); | ||
| return VertexOutput(pos, uv); | ||
| } | ||
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| fn blend_func(src: vec3<f32>, dst: vec3<f32>) -> vec3<f32> { | ||
| switch (blend.mode) { | ||
| default: { | ||
| return src; | ||
| } | ||
| case 1: { // Multiply | ||
| return src * dst; | ||
| } | ||
| case 2: { // Screen | ||
| return (dst + src) - (dst * src); | ||
| } | ||
| case 3: { // Lighten | ||
| return max(dst, src); | ||
| } | ||
| case 4: { // Darken | ||
| return min(dst, src); | ||
| } | ||
| case 5: { // Difference | ||
| return abs(dst - src); | ||
| } | ||
| case 8: { // Invert | ||
| return 1.0 - dst; | ||
| } | ||
| case 11: { // Overlay | ||
| var out = src; | ||
| if (dst.r <= 0.5) { out.r = (2.0 * src.r * dst.r); } else { out.r = (1.0 - 2.0 * (1.0 - dst.r) * (1.0 - src.r)); } | ||
| if (dst.g <= 0.5) { out.g = (2.0 * src.g * dst.g); } else { out.g = (1.0 - 2.0 * (1.0 - dst.g) * (1.0 - src.g)); } | ||
| if (dst.b <= 0.5) { out.b = (2.0 * src.b * dst.b); } else { out.b = (1.0 - 2.0 * (1.0 - dst.b) * (1.0 - src.b)); } | ||
| return out; | ||
| } | ||
| case 12: { // Hardlight | ||
| var out = src; | ||
| if (src.r <= 0.5) { out.r = (2.0 * src.r * dst.r); } else { out.r = (1.0 - 2.0 * (1.0 - dst.r) * (1.0 - src.r)); } | ||
| if (src.g <= 0.5) { out.g = (2.0 * src.g * dst.g); } else { out.g = (1.0 - 2.0 * (1.0 - dst.g) * (1.0 - src.g)); } | ||
| if (src.b <= 0.5) { out.b = (2.0 * src.b * dst.b); } else { out.b = (1.0 - 2.0 * (1.0 - dst.b) * (1.0 - src.b)); } | ||
| return out; | ||
| } | ||
| } | ||
| } | ||
|
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||
| @fragment | ||
| fn main_fragment(in: VertexOutput) -> @location(0) vec4<f32> { | ||
| // dst is the parent pixel we're blending onto - it is either 0 or 1 alpha. | ||
| var dst: vec4<f32> = textureSample(parent_texture, texture_sampler, in.uv); | ||
| // src is the pixel that we want to apply - it may have any alpha. | ||
| var src: vec4<f32> = textureSample(current_texture, texture_sampler, in.uv); | ||
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| if (src.a > 0.0) { | ||
| if (blend.mode == 6) { // Add | ||
| return vec4<f32>(src.rgb + dst.rgb, 1.0); | ||
| } else if (blend.mode == 7) { // Subtract | ||
| return vec4<f32>(dst.rgb - src.rgb, 1.0); | ||
| } else if (blend.mode == 9) { // Alpha | ||
| return vec4<f32>(dst.rgb * src.a, src.a * dst.a); | ||
| } else if (blend.mode == 10) { // Erase | ||
| return vec4<f32>(dst.rgb * (1.0 - src.a), (1.0 - src.a) * dst.a); | ||
| } else { | ||
| return vec4<f32>(src.rgb * (1.0 - dst.a) + dst.rgb * (1.0 - src.a) + src.a * dst.a * blend_func(src.rgb / src.a, dst.rgb/ dst.a), src.a + dst.a * (1.0 - src.a)); | ||
| } | ||
| } else { | ||
| return dst; | ||
| } | ||
| } |
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