video_core: Take factors into account with min/max blending functions (#6925)

* sw_framebuffer: Take factors into account for min/max blending

* renderer_gl: Take factors into account for min/max blending

* Address review comments

* gl_shader_gen: Fix frambuffer fetch on qcom and mali

* renderer_opengl: Add fallback path for mesa

* gl_shader_gen: Avoid emitting blend emulation if minmax_factor is present

src/video_core/shader/shader_uniforms.cpp

@@ -69,6 +69,7 @@ layout ({}std140) uniform shader_data {{
     vec3 tex_lod_bias;
     vec4 tex_border_color[3];
     vec4 clip_coef;
+    vec4 blend_color;
 }};
 )";
 

src/video_core/shader/shader_uniforms.h

@@ -66,9 +66,10 @@ struct UniformData {
     alignas(16) Common::Vec3f tex_lod_bias;
     alignas(16) Common::Vec4f tex_border_color[3];
     alignas(16) Common::Vec4f clip_coef;
+    alignas(16) Common::Vec4f blend_color;
 };
 
-static_assert(sizeof(UniformData) == 0x530,
+static_assert(sizeof(UniformData) == 0x540,
               "The size of the UniformData does not match the structure in the shader");
 static_assert(sizeof(UniformData) < 16384,
               "UniformData structure must be less than 16kb as per the OpenGL spec");