renderer_vulkan: implement layer stack composition

src/video_core/host_shaders/opengl_present_scaleforce.frag

@@ -26,21 +26,11 @@
 
 #endif
 
-#ifdef VULKAN
-
-#define BINDING_COLOR_TEXTURE 1
-
-#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv
-
-#define BINDING_COLOR_TEXTURE 0
-
-#endif
-
 layout (location = 0) in vec2 tex_coord;
 
 layout (location = 0) out vec4 frag_color;
 
-layout (binding = BINDING_COLOR_TEXTURE) uniform sampler2D input_texture;
+layout (binding = 0) uniform sampler2D input_texture;
 
 const bool ignore_alpha = true;
 

src/video_core/host_shaders/present_bicubic.frag

@@ -3,22 +3,12 @@
 
 #version 460 core
 
-#ifdef VULKAN
-
-#define BINDING_COLOR_TEXTURE 1
-
-#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv
-
-#define BINDING_COLOR_TEXTURE 0
-
-#endif
-
 
 layout (location = 0) in vec2 frag_tex_coord;
 
 layout (location = 0) out vec4 color;
 
-layout (binding = BINDING_COLOR_TEXTURE) uniform sampler2D color_texture;
+layout (binding = 0) uniform sampler2D color_texture;
 
 vec4 cubic(float v) {
     vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;

src/video_core/host_shaders/present_gaussian.frag

@@ -7,21 +7,11 @@
 
 #version 460 core
 
-#ifdef VULKAN
-
-#define BINDING_COLOR_TEXTURE 1
-
-#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv
-
-#define BINDING_COLOR_TEXTURE 0
-
-#endif
-
 layout(location = 0) in vec2 frag_tex_coord;
 
 layout(location = 0) out vec4 color;
 
-layout(binding = BINDING_COLOR_TEXTURE) uniform sampler2D color_texture;
+layout(binding = 0) uniform sampler2D color_texture;
 
 const float offset[3] = float[](0.0, 1.3846153846, 3.2307692308);
 const float weight[3] = float[](0.2270270270, 0.3162162162, 0.0702702703);

src/video_core/host_shaders/vulkan_present.frag

@@ -7,7 +7,7 @@ layout (location = 0) in vec2 frag_tex_coord;
 
 layout (location = 0) out vec4 color;
 
-layout (binding = 1) uniform sampler2D color_texture;
+layout (binding = 0) uniform sampler2D color_texture;
 
 void main() {
     color = texture(color_texture, frag_tex_coord);

src/video_core/host_shaders/vulkan_present.vert

@@ -3,16 +3,37 @@
 
 #version 460 core
 
-layout (location = 0) in vec2 vert_position;
-layout (location = 1) in vec2 vert_tex_coord;
-
 layout (location = 0) out vec2 frag_tex_coord;
 
-layout (set = 0, binding = 0) uniform MatrixBlock {
-    mat4 modelview_matrix;
+struct ScreenRectVertex {
+    vec2 position;
+    vec2 tex_coord;
 };
 
-void main() {
-    gl_Position = modelview_matrix * vec4(vert_position, 0.0, 1.0);
-    frag_tex_coord = vert_tex_coord;
+layout (push_constant) uniform PushConstants {
+    mat4 modelview_matrix;
+    ScreenRectVertex vertices[4];
+};
+
+// Vulkan spec 15.8.1:
+//   Any member of a push constant block that is declared as an
+//   array must only be accessed with dynamically uniform indices.
+ScreenRectVertex GetVertex(int index) {
+    switch (index) {
+    case 0:
+    default:
+        return vertices[0];
+    case 1:
+        return vertices[1];
+    case 2:
+        return vertices[2];
+    case 3:
+        return vertices[3];
+    }
+}
+
+void main() {
+    ScreenRectVertex vertex = GetVertex(gl_VertexIndex);
+    gl_Position = modelview_matrix * vec4(vertex.position, 0.0, 1.0);
+    frag_tex_coord = vertex.tex_coord;
 }

src/video_core/host_shaders/vulkan_present_scaleforce_fp16.frag

@@ -5,6 +5,7 @@
 
 #extension GL_GOOGLE_include_directive : enable
 
+#define VERSION 1
 #define YUZU_USE_FP16
 
 #include "opengl_present_scaleforce.frag"

src/video_core/host_shaders/vulkan_present_scaleforce_fp32.frag

@@ -5,4 +5,6 @@
 
 #extension GL_GOOGLE_include_directive : enable
 
+#define VERSION 1
+
 #include "opengl_present_scaleforce.frag"