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nous postfx

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Sergio
2026-03-21 15:14:31 +01:00
parent 06457654f4
commit aa292dcd92
13 changed files with 583 additions and 258 deletions
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118
source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp
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@@ -48,32 +48,110 @@ struct PostFXUniforms {
float chroma_strength;
float scanline_strength;
float screen_height;
float mask_strength;
float gamma_strength;
float curvature;
float bleeding;
};
// YCbCr helpers for NTSC bleeding
static float3 rgb_to_ycc(float3 rgb) {
return float3(
0.299f*rgb.r + 0.587f*rgb.g + 0.114f*rgb.b,
-0.169f*rgb.r - 0.331f*rgb.g + 0.500f*rgb.b + 0.5f,
0.500f*rgb.r - 0.419f*rgb.g - 0.081f*rgb.b + 0.5f
);
}
static float3 ycc_to_rgb(float3 ycc) {
float y = ycc.x;
float cb = ycc.y - 0.5f;
float cr = ycc.z - 0.5f;
return clamp(float3(
y + 1.402f*cr,
y - 0.344f*cb - 0.714f*cr,
y + 1.772f*cb
), 0.0f, 1.0f);
}
fragment float4 postfx_fs(PostVOut in [[stage_in]],
texture2d<float> scene [[texture(0)]],
sampler samp [[sampler(0)]],
constant PostFXUniforms& u [[buffer(0)]]) {
float ca = u.chroma_strength * 0.005;
float4 color;
color.r = scene.sample(samp, in.uv + float2( ca, 0.0)).r;
color.g = scene.sample(samp, in.uv).g;
color.b = scene.sample(samp, in.uv - float2( ca, 0.0)).b;
color.a = scene.sample(samp, in.uv).a;
float2 uv = in.uv;
// Curvatura barrel CRT
if (u.curvature > 0.0f) {
float2 c = uv - 0.5f;
float rsq = dot(c, c);
float2 dist = float2(0.05f, 0.1f) * u.curvature;
float2 barrelScale = 1.0f - 0.23f * dist;
c += c * (dist * rsq);
c *= barrelScale;
if (abs(c.x) >= 0.5f || abs(c.y) >= 0.5f) {
return float4(0.0f, 0.0f, 0.0f, 1.0f);
}
uv = c + 0.5f;
}
// Muestra base
float3 base = scene.sample(samp, uv).rgb;
// Sangrado NTSC — difuminado horizontal de crominancia
float3 colour;
if (u.bleeding > 0.0f) {
float tw = float(scene.get_width());
float3 ycc = rgb_to_ycc(base);
float3 ycc_l2 = rgb_to_ycc(scene.sample(samp, uv - float2(2.0f/tw, 0.0f)).rgb);
float3 ycc_l1 = rgb_to_ycc(scene.sample(samp, uv - float2(1.0f/tw, 0.0f)).rgb);
float3 ycc_r1 = rgb_to_ycc(scene.sample(samp, uv + float2(1.0f/tw, 0.0f)).rgb);
float3 ycc_r2 = rgb_to_ycc(scene.sample(samp, uv + float2(2.0f/tw, 0.0f)).rgb);
ycc.yz = (ycc_l2.yz + ycc_l1.yz*2.0f + ycc.yz*2.0f + ycc_r1.yz*2.0f + ycc_r2.yz) / 8.0f;
colour = mix(base, ycc_to_rgb(ycc), u.bleeding);
} else {
colour = base;
}
// Aberración cromática
float ca = u.chroma_strength * 0.005f;
colour.r = scene.sample(samp, uv + float2(ca, 0.0f)).r;
colour.b = scene.sample(samp, uv - float2(ca, 0.0f)).b;
// Corrección gamma (linealizar antes de scanlines, codificar después)
if (u.gamma_strength > 0.0f) {
float3 lin = pow(colour, float3(2.4f));
colour = mix(colour, lin, u.gamma_strength);
}
// Scanlines
float texHeight = float(scene.get_height());
float scaleY = u.screen_height / texHeight;
float screenY = in.uv.y * u.screen_height;
float screenY = uv.y * u.screen_height;
float posInRow = fmod(screenY, scaleY);
float scanLineDY = posInRow / scaleY - 0.5;
float scan = max(1.0 - scanLineDY * scanLineDY * 6.0, 0.12) * 3.5;
color.rgb *= mix(1.0, scan, u.scanline_strength);
float scanLineDY = posInRow / scaleY - 0.5f;
float scan = max(1.0f - scanLineDY * scanLineDY * 6.0f, 0.12f) * 3.5f;
colour *= mix(1.0f, scan, u.scanline_strength);
float2 d = in.uv - float2(0.5, 0.5);
float vignette = 1.0 - dot(d, d) * u.vignette_strength;
color.rgb *= clamp(vignette, 0.0, 1.0);
if (u.gamma_strength > 0.0f) {
float3 enc = pow(colour, float3(1.0f/2.2f));
colour = mix(colour, enc, u.gamma_strength);
}
return color;
// Viñeta
float2 d = uv - 0.5f;
float vignette = 1.0f - dot(d, d) * u.vignette_strength;
colour *= clamp(vignette, 0.0f, 1.0f);
// Máscara de fósforo RGB
if (u.mask_strength > 0.0f) {
float whichMask = fract(in.pos.x * 0.3333333f);
float3 mask = float3(0.80f);
if (whichMask < 0.3333333f) mask.x = 1.0f;
else if (whichMask < 0.6666667f) mask.y = 1.0f;
else mask.z = 1.0f;
colour = mix(colour, colour * mask, u.mask_strength);
}
return float4(colour, 1.0f);
}
)";
// NOLINTEND(readability-identifier-naming)
@@ -423,10 +501,14 @@ auto SDL3GPUShader::createShaderSPIRV(SDL_GPUDevice* device,
return shader;
}
void SDL3GPUShader::setPostFXParams(float vignette, float scanlines, float chroma) {
uniforms_.vignette_strength = vignette;
uniforms_.scanline_strength = scanlines;
uniforms_.chroma_strength = chroma;
void SDL3GPUShader::setPostFXParams(const PostFXParams& p) {
uniforms_.vignette_strength = p.vignette;
uniforms_.scanline_strength = p.scanlines;
uniforms_.chroma_strength = p.chroma;
uniforms_.mask_strength = p.mask;
uniforms_.gamma_strength = p.gamma;
uniforms_.curvature = p.curvature;
uniforms_.bleeding = p.bleeding;
}
} // namespace Rendering

7
source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp
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@@ -7,11 +7,16 @@
// PostFX uniforms pushed to fragment stage each frame.
// Must match the MSL struct and GLSL uniform block layout.
// 8 floats = 32 bytes — meets Metal/Vulkan 16-byte alignment requirement.
struct PostFXUniforms {
float vignette_strength; // 0 = none, ~0.8 = subtle
float chroma_strength; // 0 = off, ~0.2 = subtle chromatic aberration
float scanline_strength; // 0 = off, 1 = full
float screen_height; // logical height in pixels (for resolution-independent scanlines)
float mask_strength; // 0 = off, 1 = full phosphor dot mask
float gamma_strength; // 0 = off, 1 = full gamma 2.4/2.2 correction
float curvature; // 0 = flat, 1 = max barrel distortion
float bleeding; // 0 = off, 1 = max NTSC chrominance bleeding
};
namespace Rendering {
@@ -42,7 +47,7 @@ class SDL3GPUShader : public ShaderBackend {
void uploadPixels(const Uint32* pixels, int width, int height) override;
// Actualiza los parámetros de intensidad de los efectos PostFX
void setPostFXParams(float vignette, float scanlines, float chroma) override;
void setPostFXParams(const PostFXParams& p) override;
private:
static auto createShaderMSL(SDL_GPUDevice* device,