gpu: Setup attribute locations

Make the generator generate calls for the correct glBindAttribLocation()
calls.

Usually this was done correctly, but we can't rely on it. So do it
explicitly.

gsk/gpu/gskgldevice.c

@@ -460,7 +460,7 @@ gsk_gl_device_load_shader (GskGLDevice      *self,
 
 static GLuint
 gsk_gl_device_load_program (GskGLDevice               *self,
-                            const char       *program_name,
+                            const GskGpuShaderOpClass *op_class,
                             guint32                    variation,
                             GskGpuShaderClip           clip,
                             guint                      n_external_textures,
@@ -469,11 +469,11 @@ gsk_gl_device_load_program (GskGLDevice      *self,
   GLuint vertex_shader_id, fragment_shader_id, program_id;
   GLint link_status;
 
-  vertex_shader_id = gsk_gl_device_load_shader (self, program_name, GL_VERTEX_SHADER, variation, clip, n_external_textures, error);
+  vertex_shader_id = gsk_gl_device_load_shader (self, op_class->shader_name, GL_VERTEX_SHADER, variation, clip, n_external_textures, error);
   if (vertex_shader_id == 0)
     return 0;
 
-  fragment_shader_id = gsk_gl_device_load_shader (self, program_name, GL_FRAGMENT_SHADER, variation, clip, n_external_textures, error);
+  fragment_shader_id = gsk_gl_device_load_shader (self, op_class->shader_name, GL_FRAGMENT_SHADER, variation, clip, n_external_textures, error);
   if (fragment_shader_id == 0)
     return 0;
 
@@ -482,6 +482,8 @@ gsk_gl_device_load_program (GskGLDevice      *self,
   glAttachShader (program_id, vertex_shader_id);
   glAttachShader (program_id, fragment_shader_id);
 
+  op_class->setup_attrib_locations (program_id);
+
   glLinkProgram (program_id);
 
   glGetProgramiv (program_id, GL_LINK_STATUS, &link_status);
@@ -545,7 +547,7 @@ gsk_gl_device_use_program (GskGLDevice               *self,
       return;
     }
 
-  program_id = gsk_gl_device_load_program (self, op_class->shader_name, variation, clip, n_external_textures, &error);
+  program_id = gsk_gl_device_load_program (self, op_class, variation, clip, n_external_textures, &error);
   if (program_id == 0)
     {
       g_critical ("Failed to load shader program: %s", error->message);

gsk/gpu/gskgpublendmodeop.c

@@ -51,6 +51,7 @@ static const GskGpuShaderOpClass GSK_GPU_BLEND_MODE_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_blendmode_info,
 #endif
+  gsk_gpu_blendmode_setup_attrib_locations,
   gsk_gpu_blendmode_setup_vao
 };
 

gsk/gpu/gskgpublurop.c

@@ -52,6 +52,7 @@ static const GskGpuShaderOpClass GSK_GPU_BLUR_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_blur_info,
 #endif
+  gsk_gpu_blur_setup_attrib_locations,
   gsk_gpu_blur_setup_vao
 };
 

gsk/gpu/gskgpuborderop.c

@@ -95,6 +95,7 @@ static const GskGpuShaderOpClass GSK_GPU_BORDER_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_border_info,
 #endif
+  gsk_gpu_border_setup_attrib_locations,
   gsk_gpu_border_setup_vao
 };
 

gsk/gpu/gskgpuboxshadowop.c

@@ -73,6 +73,7 @@ static const GskGpuShaderOpClass GSK_GPU_BOX_SHADOW_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_boxshadow_info,
 #endif
+  gsk_gpu_boxshadow_setup_attrib_locations,
   gsk_gpu_boxshadow_setup_vao
 };
 

gsk/gpu/gskgpucolorizeop.c

@@ -49,6 +49,7 @@ static const GskGpuShaderOpClass GSK_GPU_COLORIZE_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_colorize_info,
 #endif
+  gsk_gpu_colorize_setup_attrib_locations,
   gsk_gpu_colorize_setup_vao
 };
 

gsk/gpu/gskgpucolormatrixop.c

@@ -48,6 +48,7 @@ static const GskGpuShaderOpClass GSK_GPU_COLOR_MATRIX_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_colormatrix_info,
 #endif
+  gsk_gpu_colormatrix_setup_attrib_locations,
   gsk_gpu_colormatrix_setup_vao
 };
 

gsk/gpu/gskgpucolorop.c

@@ -49,6 +49,7 @@ static const GskGpuShaderOpClass GSK_GPU_COLOR_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_color_info,
 #endif
+  gsk_gpu_color_setup_attrib_locations,
   gsk_gpu_color_setup_vao
 };
 

gsk/gpu/gskgpuconicgradientop.c

@@ -49,6 +49,7 @@ static const GskGpuShaderOpClass GSK_GPU_CONIC_GRADIENT_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_conicgradient_info,
 #endif
+  gsk_gpu_conicgradient_setup_attrib_locations,
   gsk_gpu_conicgradient_setup_vao
 };
 

gsk/gpu/gskgpucrossfadeop.c

@@ -50,6 +50,7 @@ static const GskGpuShaderOpClass GSK_GPU_CROSS_FADE_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_crossfade_info,
 #endif
+  gsk_gpu_crossfade_setup_attrib_locations,
   gsk_gpu_crossfade_setup_vao
 };
 

gsk/gpu/gskgpulineargradientop.c

@@ -53,6 +53,7 @@ static const GskGpuShaderOpClass GSK_GPU_LINEAR_GRADIENT_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_lineargradient_info,
 #endif
+  gsk_gpu_lineargradient_setup_attrib_locations,
   gsk_gpu_lineargradient_setup_vao
 };
 

gsk/gpu/gskgpumaskop.c

@@ -49,6 +49,7 @@ static const GskGpuShaderOpClass GSK_GPU_MASK_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_mask_info,
 #endif
+  gsk_gpu_mask_setup_attrib_locations,
   gsk_gpu_mask_setup_vao
 };
 

gsk/gpu/gskgpuradialgradientop.c

@@ -53,6 +53,7 @@ static const GskGpuShaderOpClass GSK_GPU_RADIAL_GRADIENT_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_radialgradient_info,
 #endif
+  gsk_gpu_radialgradient_setup_attrib_locations,
   gsk_gpu_radialgradient_setup_vao
 };
 

gsk/gpu/gskgpuroundedcolorop.c

@@ -49,6 +49,7 @@ static const GskGpuShaderOpClass GSK_GPU_ROUNDED_COLOR_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_roundedcolor_info,
 #endif
+  gsk_gpu_roundedcolor_setup_attrib_locations,
   gsk_gpu_roundedcolor_setup_vao
 };
 

gsk/gpu/gskgpushaderopprivate.h

@@ -25,6 +25,7 @@ struct _GskGpuShaderOpClass
 #ifdef GDK_RENDERING_VULKAN
   const VkPipelineVertexInputStateCreateInfo *vertex_input_state;
 #endif
+  void                  (* setup_attrib_locations)                      (GLuint                  program);
   void                  (* setup_vao)                                   (gsize                   offset);
 };
 

gsk/gpu/gskgpustraightalphaop.c

@@ -51,6 +51,7 @@ static const GskGpuShaderOpClass GSK_GPU_STRAIGHT_ALPHA_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_straightalpha_info,
 #endif
+  gsk_gpu_straightalpha_setup_attrib_locations,
   gsk_gpu_straightalpha_setup_vao
 };
 

gsk/gpu/gskgputextureop.c

@@ -48,6 +48,7 @@ static const GskGpuShaderOpClass GSK_GPU_TEXTURE_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_texture_info,
 #endif
+  gsk_gpu_texture_setup_attrib_locations,
   gsk_gpu_texture_setup_vao
 };
 

gsk/gpu/gskgpuuberop.c

@@ -48,6 +48,7 @@ static const GskGpuShaderOpClass GSK_GPU_UBER_OP_CLASS = {
 #ifdef GDK_RENDERING_VULKAN
   &gsk_gpu_uber_info,
 #endif
+  gsk_gpu_uber_setup_attrib_locations,
   gsk_gpu_uber_setup_vao
 };
 

gsk/gpu/shaders/generate-header.py

@@ -21,6 +21,7 @@ with open(sys.argv[1]) as f:
         if not match.group(3).startswith('in'):
             raise Exception("Variable doesn't start with 'in'")
         matches.append({'name': ''.join('_' + char.lower() if char.isupper() else char for char in match.group(3))[3:],
+                        'attrib_name': match.group(3),
                         'location': int(match.group(1)),
                         'type': match.group(2)})
 
@@ -190,6 +191,19 @@ print(f'''}}
 
 ''');
 
+
+print(f'''static void
+{var_name}_setup_attrib_locations (GLuint program)
+{{''')
+
+for match in matches:
+    print(f'''  glBindAttribLocation (program, {match['location']}, "{match['attrib_name']}");''')
+
+print(f'''}}
+
+''');
+
+
 print(f'''#ifdef GDK_RENDERING_VULKAN
 
 static const VkPipelineVertexInputStateCreateInfo {var_name}_info = {{