gl renderer: Remove blend shader

It's unused.

gsk/gl/gskglrenderer.c

@@ -282,7 +282,6 @@ struct _GskGLRenderer
   union {
     Program programs[GL_N_PROGRAMS];
     struct {
-      Program blend_program;
       Program blit_program;
       Program color_program;
       Program coloring_program;
@@ -1965,7 +1964,6 @@ gsk_gl_renderer_create_programs (GskGLRenderer  *self,
     const char *vs;
     const char *fs;
   } program_definitions[] = {
-    { "blend",           "blend.vs.glsl", "blend.fs.glsl" },
     { "blit",            "blit.vs.glsl",  "blit.fs.glsl" },
     { "color",           "blit.vs.glsl",  "color.fs.glsl" },
     { "coloring",        "blit.vs.glsl",  "coloring.fs.glsl" },

gsk/gl/gskglrenderopsprivate.h

@@ -10,7 +10,7 @@
 #include "gskglrendererprivate.h"
 
 #define GL_N_VERTICES 6
-#define GL_N_PROGRAMS 12
+#define GL_N_PROGRAMS 11
 
 
 

gsk/meson.build

@@ -1,6 +1,4 @@
 gsk_private_gl_shaders = [
-  'resources/glsl/blend.fs.glsl',
-  'resources/glsl/blend.vs.glsl',
   'resources/glsl/blit.fs.glsl',
   'resources/glsl/blit.vs.glsl',
   'resources/glsl/color.fs.glsl',

gsk/resources/glsl/blend.fs.glsl

@@ -1,61 +0,0 @@
-vec3 BlendMultiply(vec3 Cb, vec3 Cs) {
-  return Cb * Cs;
-}
-
-vec3 BlendScreen(vec3 Cb, vec3 Cs) {
-  return Cb + Cs - (Cb * Cs);
-}
-
-vec3 BlendHardLight(vec3 Cb, vec3 Cs) {
-  vec3 m = BlendMultiply(Cb, 2.0 * Cs);
-  vec3 s = BlendScreen(Cb, 2.0 * Cs - 1.0);
-  vec3 edge = vec3(0.5, 0.5, 0.5);
-
-  /* Use mix() and step() to avoid a branch */
-  return mix(m, s, step(edge, Cs));
-}
-
-vec3 BlendOverlay(vec3 Cb, vec3 Cs) {
-  return BlendHardLight(Cs, Cb);
-}
-
-vec3 BlendDarken(vec3 Cb, vec3 Cs) {
-  return min(Cb, Cs);
-}
-
-vec3 BlendLighten(vec3 Cb, vec3 Cs) {
-  return max(Cb, Cs);
-}
-
-void main() {
-  vec4 Cs = Texture(u_source, vUv);
-  vec4 Cb = Texture(u_mask, vUv);
-  vec3 res;
-
-  if (uBlendMode == 0) {
-    res = Cs.xyz;
-  }
-  else if (uBlendMode == 1) {
-    res = BlendMultiply(Cb.xyz, Cs.xyz);
-  }
-  else if (uBlendMode == 2) {
-    res = BlendScreen(Cb.xyz, Cs.xyz);
-  }
-  else if (uBlendMode == 3) {
-    res = BlendOverlay(Cb.xyz, Cs.xyz);
-  }
-  else if (uBlendMode == 4) {
-    res = BlendDarken(Cb.xyz, Cs.xyz);
-  }
-  else if (uBlendMode == 5) {
-    res = BlendLighten(Cb.xyz, Cs.xyz);
-  }
-  else if (uBlendMode == 8) {
-    res = BlendHardLight(Cb.xyz, Cs.xyz);
-  }
-  else {
-    // Use red for debugging missing blend modes
-    res = vec3(1.0, 0.0, 0.0);
-  }
-  setOutputColor(vec4(res, Cs.a) * u_alpha);
-}

gsk/resources/glsl/blend.vs.glsl

@@ -1,5 +0,0 @@
-void main() {
-  gl_Position = u_modelview * u_projection * vec4(aPosition, 0.0, 1.0);
-
-  vUv = vec2(aUv.x, aUv.y);
-}