Backends: SDLGPU3: Added sdl_gpu backend (amends). (#8163, #7998, #7988)

backends/sdlgpu3/build_instructions.txt

@@ -1,3 +1,7 @@
+
+Instructions to rebuild imgui_impl_sdlgpu3_shaders.h
+(You don't need to copy this folder if you are using the backend as-is)
+
 1) Compile the raw shader files to SPIRV:
 
     glslc -o vertex.spv -c shader.vert
@@ -33,4 +37,4 @@
     Proceed to step 4
 
 
-4) Either find a way to load the shader bytecode from file, or use a tool like https://notisrac.github.io/FileToCArray/ to convert the file to a uint8_t array
+4) Use a tool like https://notisrac.github.io/FileToCArray/ or misc/fonts/binary_to_compressed_c.cpp in imgui repository to convert the file to a uint8_t array.

backends/sdlgpu3/shader.frag

@@ -3,7 +3,8 @@ layout(location = 0) out vec4 fColor;
 
 layout(set=2, binding=0) uniform sampler2D sTexture;
 
-layout(location = 0) in struct {
+layout(location = 0) in struct
+{
     vec4 Color;
     vec2 UV;
 } In;
@@ -11,4 +12,4 @@ layout(location = 0) in struct {
 void main()
 {
     fColor = In.Color * texture(sTexture, In.UV.st);
-}
+}

backends/sdlgpu3/shader.vert

@@ -3,12 +3,14 @@ layout(location = 0) in vec2 aPos;
 layout(location = 1) in vec2 aUV;
 layout(location = 2) in vec4 aColor;
 
-layout(set=1,binding=0) uniform UBO {
+layout(set=1,binding=0) uniform UBO
+{
     vec2 uScale;
     vec2 uTranslate;
 } ubo;
 
-layout(location = 0) out struct {
+layout(location = 0) out struct
+{
     vec4 Color;
     vec2 UV;
 } Out;
@@ -19,4 +21,4 @@ void main()
     Out.UV = aUV;
     gl_Position = vec4(aPos * ubo.uScale + ubo.uTranslate, 0, 1);
     gl_Position.y *= -1.0f;
-}
+}