postfx subpixel

data/shaders/crtpi_fragment.glsl

@@ -31,9 +31,10 @@ out vec4 FragColor;
 // Uniforms
 uniform sampler2D Texture;
 uniform vec2 TextureSize;
-uniform float uVignette;   // 0 = sin viñeta, 1 = máxima
+uniform float uVignette;      // 0 = sin viñeta, 1 = máxima
-uniform float uScanlines;  // 0 = desactivadas, 1 = plenas
+uniform float uScanlines;     // 0 = desactivadas, 1 = plenas
-uniform float uChroma;     // 0 = sin aberración, 1 = máxima
+uniform float uChroma;        // 0 = sin aberración, 1 = máxima
+uniform float uOutputHeight;  // altura del viewport en pixels de pantalla
 
 #if defined(CURVATURE)
 vec2 Distort(vec2 coord)
@@ -103,8 +104,20 @@ void main()
 #else
 	float tempY = floor(texcoordInPixels.y) + 0.5;
 	float yCoord = tempY / TextureSize.y;
+
+	// Scanline en espacio de pantalla (subpíxel)
+	float scaleY = uOutputHeight / TextureSize.y;
+	float screenY = vTexCoord.y * uOutputHeight;
+	float posInRow = mod(screenY, scaleY);
+	float scanLineDY = posInRow / scaleY - 0.5;
+	float localFilterWidth = 1.0 / scaleY;
+	float scanLineWeight = CalcScanLineWeight(scanLineDY);
+	scanLineWeight += CalcScanLineWeight(scanLineDY - localFilterWidth);
+	scanLineWeight += CalcScanLineWeight(scanLineDY + localFilterWidth);
+	scanLineWeight *= 0.3333333;
+
+	// Phosphor blur en espacio textura (sin cambios)
 	float dy = texcoordInPixels.y - tempY;
-	float scanLineWeight = CalcScanLine(dy);
 	float signY = sign(dy);
 	dy = dy * dy;
 	dy = dy * dy;

data/shaders/crtpi_fragment_es.glsl

@@ -34,9 +34,10 @@ out vec4 FragColor;
 // Uniforms
 uniform sampler2D Texture;
 uniform vec2 TextureSize;
-uniform float uVignette;   // 0 = sin viñeta, 1 = máxima
+uniform float uVignette;      // 0 = sin viñeta, 1 = máxima
-uniform float uScanlines;  // 0 = desactivadas, 1 = plenas
+uniform float uScanlines;     // 0 = desactivadas, 1 = plenas
-uniform float uChroma;     // 0 = sin aberración, 1 = máxima
+uniform float uChroma;        // 0 = sin aberración, 1 = máxima
+uniform float uOutputHeight;  // altura del viewport en pixels de pantalla
 
 #if defined(CURVATURE)
 vec2 Distort(vec2 coord)
@@ -106,8 +107,20 @@ void main()
 #else
 	float tempY = floor(texcoordInPixels.y) + 0.5;
 	float yCoord = tempY / TextureSize.y;
+
+	// Scanline en espacio de pantalla (subpíxel)
+	float scaleY = uOutputHeight / TextureSize.y;
+	float screenY = vTexCoord.y * uOutputHeight;
+	float posInRow = mod(screenY, scaleY);
+	float scanLineDY = posInRow / scaleY - 0.5;
+	float localFilterWidth = 1.0 / scaleY;
+	float scanLineWeight = CalcScanLineWeight(scanLineDY);
+	scanLineWeight += CalcScanLineWeight(scanLineDY - localFilterWidth);
+	scanLineWeight += CalcScanLineWeight(scanLineDY + localFilterWidth);
+	scanLineWeight *= 0.3333333;
+
+	// Phosphor blur en espacio textura (sin cambios)
 	float dy = texcoordInPixels.y - tempY;
-	float scanLineWeight = CalcScanLine(dy);
 	float signY = sign(dy);
 	dy = dy * dy;
 	dy = dy * dy;

source/core/rendering/opengl/opengl_shader.cpp

@@ -338,9 +338,10 @@ auto OpenGLShader::init(SDL_Window* window,
     }
 
     // Uniforms PostFX
-    vignette_location_  = glGetUniformLocation(program_id_, "uVignette");
+    vignette_location_       = glGetUniformLocation(program_id_, "uVignette");
-    scanlines_location_ = glGetUniformLocation(program_id_, "uScanlines");
+    scanlines_location_      = glGetUniformLocation(program_id_, "uScanlines");
-    chroma_location_    = glGetUniformLocation(program_id_, "uChroma");
+    chroma_location_         = glGetUniformLocation(program_id_, "uChroma");
+    output_height_location_  = glGetUniformLocation(program_id_, "uOutputHeight");
     if (vignette_location_ != -1)  { glUniform1f(vignette_location_,  postfx_vignette_);  }
     if (scanlines_location_ != -1) { glUniform1f(scanlines_location_, postfx_scanlines_); }
     if (chroma_location_ != -1)    { glUniform1f(chroma_location_,    postfx_chroma_);    }
@@ -446,6 +447,10 @@ void OpenGLShader::render() {
     glViewport(viewport_x, viewport_y, viewport_w, viewport_h);
     checkGLError("glViewport");
 
+    if (output_height_location_ != -1) {
+        glUniform1f(output_height_location_, static_cast<float>(viewport_h));
+    }
+
     // Dibujar quad usando VAO
     glBindVertexArray(vao_);
     glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);

source/core/rendering/opengl/opengl_shader.hpp

@@ -59,6 +59,7 @@ class OpenGLShader : public ShaderBackend {
         GLint vignette_location_ = -1;
         GLint scanlines_location_ = -1;
         GLint chroma_location_ = -1;
+        GLint output_height_location_ = -1;
 
         // Valores cacheados de PostFX
         float postfx_vignette_ = 0.6F;

source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp

@@ -61,7 +61,12 @@ fragment float4 postfx_fs(PostVOut                 in    [[stage_in]],
     color.b = scene.sample(samp, in.uv - float2( ca, 0.0)).b;
     color.a = scene.sample(samp, in.uv).a;
 
-    float scan = 0.85 + 0.15 * sin(in.uv.y * 3.14159265 * u.screen_height);
+    float texHeight  = float(scene.get_height());
+    float scaleY     = u.screen_height / texHeight;
+    float screenY    = in.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);
 
     float2 d = in.uv - float2(0.5, 0.5);
@@ -312,6 +317,8 @@ void SDL3GPUShader::render() {
         return;
     }
 
+    uniforms_.screen_height = static_cast<float>(sh);
+
     // ---- Render pass: PostFX → swapchain ----
     SDL_GPUColorTargetInfo color_target = {};
     color_target.texture = swapchain;