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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2022 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup gpu
*
* Glue definition to make shared declaration of struct & functions work in both C / C++ and GLSL.
* We use the same vector and matrix types as Blender C++. Some math functions are defined to use
* the float version to match the GLSL syntax.
* This file can be used for C & C++ code and the syntax used should follow the same rules.
* Some preprocessing is done by the GPU backend to make it GLSL compatible.
*
* IMPORTANT:
* - Don't add trailing comma at the end of the enum. Our custom pre-processor will noy trim it
* for GLSL.
* - Always use `u` suffix for enum values. GLSL do not support implicit cast.
* - Define all values. This is in order to simplify custom pre-processor code.
* - Always use uint32_t as underlying type.
* - Use float suffix by default for float literals to avoid double promotion in C++.
* - Pack one float or int after a vec3/ivec3 to fullfil alligment rules.
*
* NOTE: Due to alignment restriction and buggy drivers, do not try to use mat3 inside structs.
* NOTE: (UBO only) Do not use arrays of float. They are padded to arrays of vec4 and are not worth
* it. This does not apply to SSBO.
*
* IMPORTANT: Do not forget to align mat4, vec3 and vec4 to 16 bytes, and vec2 to 8 bytes.
*
* NOTE: You can use bool type using bool1 a int boolean type matching the GLSL type.
*/
#ifdef GPU_SHADER
# define BLI_STATIC_ASSERT_ALIGN(type_, align_)
# define BLI_STATIC_ASSERT_SIZE(type_, size_)
# define static
# define inline
# define cosf cos
# define sinf sin
# define tanf tan
# define acosf acos
# define asinf asin
# define atanf atan
# define floorf floor
# define ceilf ceil
# define sqrtf sqrt
# define float2 vec2
# define float3 vec3
# define float4 vec4
# define float4x4 mat4
# define int2 ivec2
# define int3 ivec3
# define int4 ivec4
# define uint2 uvec2
# define uint3 uvec3
# define uint4 uvec4
# define bool1 bool
# define bool2 bvec2
# define bool3 bvec3
# define bool4 bvec4
#else /* C */
# pragma once
# include "BLI_assert.h"
# ifdef __cplusplus
# include "BLI_float4x4.hh"
# include "BLI_float4x4.hh"
# else
typedef float float2[2];
typedef float float3[3];
typedef float float4[4];
typedef float float4x4[4][4];
# endif
typedef int int2[2];
typedef int int3[2];
typedef int int4[4];
typedef uint uint2[2];
typedef uint uint3[3];
typedef uint uint4[4];
typedef int int2[2];
typedef int int3[2];
typedef int int4[4];
typedef int bool1;
typedef int bool2[2];
typedef int bool3[2];
typedef int bool4[4];
#endif
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