host_shaders: Add texture color blit fragment shader

src/video_core/host_shaders/CMakeLists.txt

@@ -8,6 +8,7 @@ set(SHADER_FILES
     opengl_present.frag
     opengl_present.vert
     pitch_unswizzle.comp
+    vulkan_blit_color_float.frag
     vulkan_present.frag
     vulkan_present.vert
 )

src/video_core/host_shaders/vulkan_blit_color_float.frag

@@ -0,0 +1,14 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#version 450
+
+layout(binding = 0) uniform sampler2D tex;
+
+layout(location = 0) in vec2 texcoord;
+layout(location = 0) out vec4 color;
+
+void main() {
+    color = textureLod(tex, texcoord, 0);
+}