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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) 2016 by Mike Erwin.
* All rights reserved.
*/
/** \file
* \ingroup gpu
*
* GPU shader interface (C --> GLSL)
*/
#ifndef __GPU_SHADER_INTERFACE_H__
#define __GPU_SHADER_INTERFACE_H__
#include "GPU_common.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
GPU_UNIFORM_NONE = 0, /* uninitialized/unknown */
GPU_UNIFORM_MODEL, /* mat4 ModelMatrix */
GPU_UNIFORM_VIEW, /* mat4 ViewMatrix */
GPU_UNIFORM_MODELVIEW, /* mat4 ModelViewMatrix */
GPU_UNIFORM_PROJECTION, /* mat4 ProjectionMatrix */
GPU_UNIFORM_VIEWPROJECTION, /* mat4 ViewProjectionMatrix */
GPU_UNIFORM_MVP, /* mat4 ModelViewProjectionMatrix */
GPU_UNIFORM_MODEL_INV, /* mat4 ModelMatrixInverse */
GPU_UNIFORM_VIEW_INV, /* mat4 ViewMatrixInverse */
GPU_UNIFORM_MODELVIEW_INV, /* mat4 ModelViewMatrixInverse */
GPU_UNIFORM_PROJECTION_INV, /* mat4 ProjectionMatrixInverse */
GPU_UNIFORM_VIEWPROJECTION_INV, /* mat4 ViewProjectionMatrixInverse */
GPU_UNIFORM_NORMAL, /* mat3 NormalMatrix */
GPU_UNIFORM_ORCO, /* vec4 OrcoTexCoFactors[] */
GPU_UNIFORM_CLIPPLANES, /* vec4 WorldClipPlanes[] */
GPU_UNIFORM_COLOR, /* vec4 color */
GPU_UNIFORM_BASE_INSTANCE, /* int baseInstance */
GPU_UNIFORM_RESOURCE_CHUNK, /* int resourceChunk */
GPU_UNIFORM_RESOURCE_ID, /* int resourceId */
GPU_UNIFORM_SRGB_TRANSFORM, /* bool srgbTarget */
GPU_UNIFORM_CUSTOM, /* custom uniform, not one of the above built-ins */
GPU_NUM_UNIFORMS, /* Special value, denotes number of builtin uniforms. */
} GPUUniformBuiltin;
typedef struct GPUShaderInput {
uint32_t name_offset;
uint32_t name_hash;
int32_t location;
/** Defined at interface creation or in shader. Only for Samplers, UBOs and Vertex Attribs. */
int32_t binding;
} GPUShaderInput;
#define GPU_SHADERINTERFACE_REF_ALLOC_COUNT 16
typedef struct GPUShaderInterface {
/** Buffer containing all inputs names separated by '\0'. */
char *name_buffer;
/** Reference to GPUBatches using this interface */
struct GPUBatch **batches;
uint batches_len;
/** Input counts. */
uint attribute_len;
uint ubo_len;
uint uniform_len;
/** Enabled bindpoints that needs to be fed with data. */
uint16_t enabled_attr_mask;
uint16_t enabled_ubo_mask;
uint64_t enabled_tex_mask;
/** Opengl Location of builtin uniforms. Fast access, no lookup needed. */
/* TODO replace by location only array. */
GPUShaderInput builtins[GPU_NUM_UNIFORMS];
/** Flat array. In this order: Attributes, Ubos, Uniforms. */
GPUShaderInput inputs[0];
} GPUShaderInterface;
GPUShaderInterface *GPU_shaderinterface_create(int32_t program_id);
void GPU_shaderinterface_discard(GPUShaderInterface *);
const GPUShaderInput *GPU_shaderinterface_uniform(const GPUShaderInterface *, const char *name);
const GPUShaderInput *GPU_shaderinterface_uniform_builtin(const GPUShaderInterface *,
GPUUniformBuiltin);
const GPUShaderInput *GPU_shaderinterface_ubo(const GPUShaderInterface *, const char *name);
const GPUShaderInput *GPU_shaderinterface_attr(const GPUShaderInterface *, const char *name);
/* keep track of batches using this interface */
void GPU_shaderinterface_add_batch_ref(GPUShaderInterface *, struct GPUBatch *);
void GPU_shaderinterface_remove_batch_ref(GPUShaderInterface *, struct GPUBatch *);
#ifdef __cplusplus
}
#endif
#endif /* __GPU_SHADER_INTERFACE_H__ */
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