/*
 * Copyright 2020-2022 Matias N. Goldberg
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */


#define min3( a, b, c ) min( a, min( b, c ) )
#define max3( a, b, c ) max( a, max( b, c ) )

#define float2 vec2
#define float3 vec3
#define float4 vec4

#define int2 ivec2
#define int3 ivec3
#define int4 ivec4

#define uint2 uvec2
#define uint3 uvec3
#define uint4 uvec4

#define float2x2 mat2
#define float3x3 mat3
#define float4x4 mat4
#define ogre_float4x3 mat3x4

#define ushort uint
#define ushort3 uint3
#define ushort4 uint4

//Short used for read operations. It's an int in GLSL & HLSL. An ushort in Metal
#define rshort int
#define rshort2 int2
#define rint int
//Short used for write operations. It's an int in GLSL. An ushort in HLSL & Metal
#define wshort2 int2
#define wshort3 int3

#define toFloat3x3( x ) mat3( x )
#define buildFloat3x3( row0, row1, row2 ) mat3( row0, row1, row2 )

#define mul( x, y ) ((x) * (y))
#define saturate(x) clamp( (x), 0.0, 1.0 )
#define lerp mix
#define rsqrt inversesqrt
#define INLINE
#define NO_INTERPOLATION_PREFIX flat
#define NO_INTERPOLATION_SUFFIX

#define PARAMS_ARG_DECL
#define PARAMS_ARG

#define reversebits bitfieldReverse

#define OGRE_Sample( tex, sampler, uv ) texture( tex, uv )
#define OGRE_SampleLevel( tex, sampler, uv, lod ) textureLod( tex, uv, lod )
#define OGRE_SampleArray2D( tex, sampler, uv, arrayIdx ) texture( tex, vec3( uv, arrayIdx ) )
#define OGRE_SampleArray2DLevel( tex, sampler, uv, arrayIdx, lod ) textureLod( tex, vec3( uv, arrayIdx ), lod )
#define OGRE_SampleArrayCubeLevel( tex, sampler, uv, arrayIdx, lod ) textureLod( tex, vec4( uv, arrayIdx ), lod )
#define OGRE_SampleGrad( tex, sampler, uv, ddx, ddy ) textureGrad( tex, uv, ddx, ddy )
#define OGRE_SampleArray2DGrad( tex, sampler, uv, arrayIdx, ddx, ddy ) textureGrad( tex, vec3( uv, arrayIdx ), ddx, ddy )
#define OGRE_ddx( val ) dFdx( val )
#define OGRE_ddy( val ) dFdy( val )
#define OGRE_Load2D( tex, iuv, lod ) texelFetch( tex, iuv, lod )
#define OGRE_LoadArray2D( tex, iuv, arrayIdx, lod ) texelFetch( tex, ivec3( iuv, arrayIdx ), lod )
#define OGRE_Load2DMS( tex, iuv, subsample ) texelFetch( tex, iuv, subsample )

#define OGRE_Load3D( tex, iuv, lod ) texelFetch( tex, ivec3( iuv ), lod )

#define OGRE_GatherRed( tex, sampler, uv ) textureGather( tex, uv, 0 )
#define OGRE_GatherGreen( tex, sampler, uv ) textureGather( tex, uv, 1 )
#define OGRE_GatherBlue( tex, sampler, uv ) textureGather( tex, uv, 2 )

#define bufferFetch1( buffer, idx ) texelFetch( buffer, idx ).x

#define OGRE_SAMPLER_ARG_DECL( samplerName )
#define OGRE_SAMPLER_ARG( samplerName )

#define OGRE_Texture3D_float4 sampler3D
#define OGRE_OUT_REF( declType, variableName ) out declType variableName
#define OGRE_INOUT_REF( declType, variableName ) inout declType variableName