feat(macos): suport Metal per GpuShaderPreset via spirv-cross
- CMakeLists: bloc if(APPLE) que transpila .spv → .spv.msl amb spirv-cross - gpu_shader_preset: carrega MSL (main0) a macOS, SPIR-V (main) a la resta - Afegeix null-terminator als buffers MSL (SDL3 els tracta com C-string) - README: secció de dependències de shaders per plataforma (Vulkan SDK, spirv-cross) - Inclou .spv.msl generats per ntsc-md-rainbows Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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data/shaders/ntsc-md-rainbows/pass1_decode.frag.spv.msl
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data/shaders/ntsc-md-rainbows/pass1_decode.frag.spv.msl
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#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct NTSCParams
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{
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float source_width;
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float source_height;
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float a_value;
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float b_value;
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float cc_value;
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float scan_time;
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float notch_width;
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float y_freq;
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float i_freq;
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float q_freq;
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float _pad0;
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float _pad1;
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};
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struct main0_out
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{
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float4 FragColor [[color(0)]];
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};
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struct main0_in
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{
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float2 v_uv [[user(locn0)]];
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};
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fragment main0_out main0(main0_in in [[stage_in]], constant NTSCParams& u [[buffer(0)]], texture2d<float> Source [[texture(0)]], sampler SourceSmplr [[sampler(0)]])
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{
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main0_out out = {};
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float2 source_dims = float2(u.source_width, u.source_height);
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float4 BaseTexel = Source.sample(SourceSmplr, in.v_uv);
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float CCValue = u.cc_value;
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float ScanTime = u.scan_time;
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float NotchHalfWidth = u.notch_width / 2.0;
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float YFreqResponse = u.y_freq;
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float IFreqResponse = u.i_freq;
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float QFreqResponse = u.q_freq;
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float AValue = u.a_value;
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float BValue = u.b_value;
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float TimePerSample = ScanTime / (source_dims.x * 4.0);
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float Fc_y1 = (CCValue - NotchHalfWidth) * TimePerSample;
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float Fc_y2 = (CCValue + NotchHalfWidth) * TimePerSample;
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float Fc_y3 = YFreqResponse * TimePerSample;
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float Fc_i = IFreqResponse * TimePerSample;
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float Fc_q = QFreqResponse * TimePerSample;
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float Fc_i_2 = Fc_i * 2.0;
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float Fc_q_2 = Fc_q * 2.0;
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float Fc_y1_2 = Fc_y1 * 2.0;
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float Fc_y2_2 = Fc_y2 * 2.0;
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float Fc_y3_2 = Fc_y3 * 2.0;
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float Fc_i_pi2 = Fc_i * 6.283185482025146484375;
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float Fc_q_pi2 = Fc_q * 6.283185482025146484375;
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float Fc_y1_pi2 = Fc_y1 * 6.283185482025146484375;
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float Fc_y2_pi2 = Fc_y2 * 6.283185482025146484375;
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float Fc_y3_pi2 = Fc_y3 * 6.283185482025146484375;
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float PI2Length = 0.098174773156642913818359375;
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float W = (6.283185482025146484375 * CCValue) * ScanTime;
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float WoPI = W / 3.1415927410125732421875;
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float HOffset = BValue / WoPI;
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float VScale = (AValue * source_dims.y) / WoPI;
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float4 YAccum = float4(0.0);
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float4 IAccum = float4(0.0);
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float4 QAccum = float4(0.0);
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float4 Cy = float4(in.v_uv.y);
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float4 VPosition = Cy;
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float4 SincY1;
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float _259;
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float _274;
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float _290;
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float _306;
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float4 SincY2;
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float _322;
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float _337;
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float _352;
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float _367;
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float4 SincY3;
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float _383;
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float _398;
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float _413;
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float _428;
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float4 IdealI;
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float _457;
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float _474;
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float _491;
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float _508;
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float4 IdealQ;
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float _526;
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float _543;
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float _560;
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float _577;
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for (float i = 0.0; i < 64.0; i += 4.0)
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{
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float n = i - 32.0;
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float4 n4 = float4(n) + float4(0.0, 1.0, 2.0, 3.0);
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float4 Cx = float4(in.v_uv.x) + ((n4 * 0.25) / float4(source_dims.x));
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float4 HPosition = Cx;
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float4 C = Source.sample(SourceSmplr, float2(Cx.x, Cy.x));
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float4 T = (HPosition + float4(HOffset)) + (VPosition * float4(VScale));
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float4 WT = T * W;
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float4 SincKernel = float4(0.540000021457672119140625) + (cos(n4 * PI2Length) * 0.4600000083446502685546875);
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float4 SincYIn1 = n4 * Fc_y1_pi2;
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float4 SincYIn2 = n4 * Fc_y2_pi2;
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float4 SincYIn3 = n4 * Fc_y3_pi2;
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float4 SincIIn = n4 * Fc_i_pi2;
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float4 SincQIn = n4 * Fc_q_pi2;
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if (SincYIn1.x != 0.0)
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{
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_259 = sin(SincYIn1.x) / SincYIn1.x;
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}
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else
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{
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_259 = 1.0;
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}
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SincY1.x = _259;
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if (SincYIn1.y != 0.0)
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{
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_274 = sin(SincYIn1.y) / SincYIn1.y;
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}
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else
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{
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_274 = 1.0;
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}
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SincY1.y = _274;
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if (SincYIn1.z != 0.0)
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{
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_290 = sin(SincYIn1.z) / SincYIn1.z;
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}
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else
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{
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_290 = 1.0;
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}
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SincY1.z = _290;
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if (SincYIn1.w != 0.0)
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{
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_306 = sin(SincYIn1.w) / SincYIn1.w;
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}
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else
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{
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_306 = 1.0;
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}
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SincY1.w = _306;
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if (SincYIn2.x != 0.0)
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{
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_322 = sin(SincYIn2.x) / SincYIn2.x;
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}
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else
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{
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_322 = 1.0;
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}
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SincY2.x = _322;
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if (SincYIn2.y != 0.0)
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{
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_337 = sin(SincYIn2.y) / SincYIn2.y;
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}
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else
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{
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_337 = 1.0;
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}
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SincY2.y = _337;
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if (SincYIn2.z != 0.0)
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{
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_352 = sin(SincYIn2.z) / SincYIn2.z;
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}
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else
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{
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_352 = 1.0;
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}
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SincY2.z = _352;
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if (SincYIn2.w != 0.0)
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{
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_367 = sin(SincYIn2.w) / SincYIn2.w;
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}
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else
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{
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_367 = 1.0;
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}
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SincY2.w = _367;
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if (SincYIn3.x != 0.0)
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{
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_383 = sin(SincYIn3.x) / SincYIn3.x;
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}
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else
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{
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_383 = 1.0;
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}
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SincY3.x = _383;
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if (SincYIn3.y != 0.0)
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{
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_398 = sin(SincYIn3.y) / SincYIn3.y;
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}
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else
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{
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_398 = 1.0;
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}
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SincY3.y = _398;
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if (SincYIn3.z != 0.0)
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{
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_413 = sin(SincYIn3.z) / SincYIn3.z;
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}
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else
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{
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_413 = 1.0;
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}
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SincY3.z = _413;
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if (SincYIn3.w != 0.0)
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{
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_428 = sin(SincYIn3.w) / SincYIn3.w;
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}
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else
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{
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_428 = 1.0;
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}
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SincY3.w = _428;
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float4 IdealY = ((SincY1 * Fc_y1_2) - (SincY2 * Fc_y2_2)) + (SincY3 * Fc_y3_2);
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if (SincIIn.x != 0.0)
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{
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_457 = sin(SincIIn.x) / SincIIn.x;
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}
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else
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{
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_457 = 1.0;
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}
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IdealI.x = Fc_i_2 * _457;
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if (SincIIn.y != 0.0)
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{
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_474 = sin(SincIIn.y) / SincIIn.y;
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}
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else
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{
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_474 = 1.0;
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}
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IdealI.y = Fc_i_2 * _474;
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if (SincIIn.z != 0.0)
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{
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_491 = sin(SincIIn.z) / SincIIn.z;
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}
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else
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{
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_491 = 1.0;
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}
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IdealI.z = Fc_i_2 * _491;
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if (SincIIn.w != 0.0)
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{
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_508 = sin(SincIIn.w) / SincIIn.w;
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}
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else
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{
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_508 = 1.0;
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}
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IdealI.w = Fc_i_2 * _508;
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if (SincQIn.x != 0.0)
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{
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_526 = sin(SincQIn.x) / SincQIn.x;
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}
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else
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{
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_526 = 1.0;
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}
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IdealQ.x = Fc_q_2 * _526;
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if (SincQIn.y != 0.0)
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{
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_543 = sin(SincQIn.y) / SincQIn.y;
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}
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else
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{
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_543 = 1.0;
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}
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IdealQ.y = Fc_q_2 * _543;
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if (SincQIn.z != 0.0)
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{
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_560 = sin(SincQIn.z) / SincQIn.z;
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}
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else
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{
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_560 = 1.0;
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}
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IdealQ.z = Fc_q_2 * _560;
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if (SincQIn.w != 0.0)
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{
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_577 = sin(SincQIn.w) / SincQIn.w;
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}
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else
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{
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_577 = 1.0;
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}
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IdealQ.w = Fc_q_2 * _577;
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float4 FilterY = SincKernel * IdealY;
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float4 FilterI = SincKernel * IdealI;
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float4 FilterQ = SincKernel * IdealQ;
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YAccum += (C * FilterY);
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IAccum += ((C * cos(WT)) * FilterI);
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QAccum += ((C * sin(WT)) * FilterQ);
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}
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float3 YIQ = float3(((YAccum.x + YAccum.y) + YAccum.z) + YAccum.w, (((IAccum.x + IAccum.y) + IAccum.z) + IAccum.w) * 2.0, (((QAccum.x + QAccum.y) + QAccum.z) + QAccum.w) * 2.0);
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float3 RGB = float3(dot(YIQ, float3(1.0, 0.95599997043609619140625, 0.620999991893768310546875)), dot(YIQ, float3(1.0, -0.272000014781951904296875, -0.647000014781951904296875)), dot(YIQ, float3(1.0, -1.10599994659423828125, 1.70299994945526123046875)));
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out.FragColor = float4(RGB, BaseTexel.w);
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return out;
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}
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