Shader "Hidden/Universal/CoreBlit"
{
    HLSLINCLUDE

        #pragma target 2.0
        #pragma editor_sync_compilation
        #pragma multi_compile _ DISABLE_TEXTURE2D_X_ARRAY
        #pragma multi_compile _ BLIT_SINGLE_SLICE
        // Core.hlsl for XR dependencies
        #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
        #include "Packages/com.unity.render-pipelines.core/Runtime/Utilities/Blit.hlsl"
    ENDHLSL

    SubShader
    {
        Tags{ "RenderPipeline" = "UniversalPipeline" }

        // 0: Nearest
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex Vert
                #pragma fragment FragNearest
            ENDHLSL
        }

        // 1: Bilinear
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex Vert
                #pragma fragment FragBilinear
            ENDHLSL
        }

        // 2: Nearest quad
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragNearest
            ENDHLSL
        }

        // 3: Bilinear quad
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragBilinear
            ENDHLSL
        }

        // 4: Nearest quad with padding
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragNearest
            ENDHLSL
        }

        // 5: Bilinear quad with padding
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragBilinear
            ENDHLSL
        }

        // 6: Nearest quad with padding
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragNearestRepeat
            ENDHLSL
        }

        // 7: Bilinear quad with padding
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragBilinearRepeat
            ENDHLSL
        }

        // 8: Bilinear quad with padding (for OctahedralTexture)
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragOctahedralBilinearRepeat
            ENDHLSL
        }

        /// Version 4, 5, 6, 7 with Alpha Blending 0.5
        // 9: Nearest quad with padding alpha blend (4 with alpha blend)
        Pass
        {
            ZWrite Off ZTest Always Blend DstColor Zero Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragNearest
                #define WITH_ALPHA_BLEND
            ENDHLSL
        }

        // 10: Bilinear quad with padding alpha blend (5 with alpha blend)
        Pass
        {
            ZWrite Off ZTest Always Blend DstColor Zero Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragBilinear
                #define WITH_ALPHA_BLEND
            ENDHLSL
        }

        // 11: Nearest quad with padding alpha blend (6 with alpha blend)
        Pass
        {
            ZWrite Off ZTest Always Blend DstColor Zero Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragNearestRepeat
                #define WITH_ALPHA_BLEND
            ENDHLSL
        }

        // 12: Bilinear quad with padding alpha blend (7 with alpha blend)
        Pass
        {
            ZWrite Off ZTest Always Blend DstColor Zero Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragBilinearRepeat
                #define WITH_ALPHA_BLEND
            ENDHLSL
        }

        // 13: Bilinear quad with padding alpha blend (for OctahedralTexture) (8 with alpha blend)
        Pass
        {
            ZWrite Off ZTest Always Blend DstColor Zero Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuadPadding
                #pragma fragment FragOctahedralBilinearRepeat
                #define WITH_ALPHA_BLEND
            ENDHLSL
        }

        // 14. Project Cube to Octahedral 2d quad
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragOctahedralProject
            ENDHLSL
        }

        // 15. Project Cube to Octahedral 2d quad with luminance (grayscale), RGBA to YYYY
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragOctahedralProjectLuminance
            ENDHLSL
        }

        // 16. Project Cube to Octahedral 2d quad with with A to RGBA (AAAA)
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragOctahedralProjectAlphaToRGBA
            ENDHLSL
        }

        // 17. Project Cube to Octahedral 2d quad with with R to RGBA (RRRR)
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragOctahedralProjectRedToRGBA
            ENDHLSL
        }

        // 18. Bilinear quad with luminance (grayscale), RGBA to YYYY
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragBilinearLuminance
            ENDHLSL
        }

        // 19. Bilinear quad with A to RGBA (AAAA)
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragBilinearAlphaToRGBA
            ENDHLSL
        }

        // 20. Bilinear quad with R to RGBA (RRRR)
        Pass
        {
            ZWrite Off ZTest Always Blend Off Cull Off

            HLSLPROGRAM
                #pragma vertex VertQuad
                #pragma fragment FragBilinearRedToRGBA
            ENDHLSL
        }
    }

    Fallback Off
}