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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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) 2013 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Brecht Van Lommel.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/gpu/intern/gpu_fixed_material.c
* \ingroup gpu
*/
/* GLSL shaders to replace fixed function OpenGL materials and lighting. These
* are deprecated in newer OpenGL versions and missing in OpenGL ES 2.0. Also,
* two sided lighting is no longer natively supported on NVidia cards which
* results in slow software fallback.
*
* Todo:
* - Replace glLight and glMaterial functions entirely with GLSL uniforms, to
* make OpenGL ES 2.0 work.
* - Replace glTexCoord and glColor with generic attributes.
* - Optimize for case where fewer than 3 or 8 lights are used.
* - Optimize for case where specular is not used.
* - Optimize for case where no texture matrix is used.
*/
#include "GL/glew.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "DNA_mesh_types.h"
#include "DNA_object_types.h"
#include "GPU_extensions.h"
/* Fixed function material types */
static struct {
GPUShader *cached_shaders[GPU_FIXED_OPTION_COMBINATIONS];
bool failed_shaders[GPU_FIXED_OPTION_COMBINATIONS];
bool need_normals;
} GPU_MATERIAL_STATE;
/* Init / exit */
void GPU_fixed_materials_init()
{
memset(&GPU_MATERIAL_STATE, 0, sizeof(GPU_MATERIAL_STATE));
}
void GPU_fixed_materials_exit()
{
int i;
for (i = 0; i < GPU_FIXED_OPTION_COMBINATIONS; i++)
if (GPU_MATERIAL_STATE.cached_shaders[i])
GPU_shader_free(GPU_MATERIAL_STATE.cached_shaders[i]);
}
/* Shader lookup / create */
static GPUShader *gpu_fixed_material_shader(int options)
{
/* glsl code */
extern char datatoc_gpu_shader_fixed_vertex_glsl[];
extern char datatoc_gpu_shader_fixed_fragment_glsl[];
/* cached shaders */
GPUShader *shader = GPU_MATERIAL_STATE.cached_shaders[options];
if (!shader && !GPU_MATERIAL_STATE.failed_shaders[options]) {
/* create shader if it doesn't exist yet */
char defines[64*GPU_FIXED_OPTIONS_NUM] = "";
if (options & GPU_FIXED_COLOR_MATERIAL)
strcat(defines, "#define USE_COLOR\n");
if (options & GPU_FIXED_TWO_SIDED)
strcat(defines, "#define USE_TWO_SIDED\n");
if (options & GPU_FIXED_SOLID_LIGHTING)
strcat(defines, "#define USE_SOLID_LIGHTING\n");
if (options & GPU_FIXED_SCENE_LIGHTING)
strcat(defines, "#define USE_SCENE_LIGHTING\n");
if (options & GPU_FIXED_TEXTURE_2D)
strcat(defines, "#define USE_TEXTURE\n");
shader = GPU_shader_create(
datatoc_gpu_shader_fixed_vertex_glsl,
datatoc_gpu_shader_fixed_fragment_glsl,
NULL, defines);
if (shader) {
/* set texture map to first texture unit */
if (options & GPU_FIXED_TEXTURE_2D)
glUniform1i(GPU_shader_get_uniform(shader, "texture_map"), 0);
GPU_MATERIAL_STATE.cached_shaders[options] = shader;
}
else
GPU_MATERIAL_STATE.failed_shaders[options] = true;
}
return shader;
}
/* Bind / unbind */
void GPU_fixed_material_shader_bind(int options)
{
if (GPU_glsl_support()) {
GPUShader *shader = gpu_fixed_material_shader(options);
if (shader)
GPU_shader_bind(shader);
}
else {
if (options & (GPU_FIXED_SOLID_LIGHTING|GPU_FIXED_SCENE_LIGHTING))
glEnable(GL_LIGHTING);
if (options & GPU_FIXED_TWO_SIDED)
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
if (options & GPU_FIXED_COLOR_MATERIAL) {
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
}
if (options & GPU_FIXED_TEXTURE_2D)
glEnable(GL_TEXTURE_2D);
}
/* temporary hack, should be solved outside of this file */
GPU_MATERIAL_STATE.need_normals = (options & (GPU_FIXED_SOLID_LIGHTING|GPU_FIXED_SCENE_LIGHTING));
}
void GPU_fixed_material_shader_unbind()
{
if (GPU_glsl_support()) {
GPU_shader_unbind();
}
else {
glDisable(GL_LIGHTING);
glDisable(GL_COLOR_MATERIAL);
glDisable(GL_TEXTURE_2D);
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_FALSE);
}
}
/* Material Colors */
void GPU_fixed_material_colors(const float diffuse[3], const float specular[3],
int shininess, float alpha)
{
float gl_diffuse[4], gl_specular[4];
copy_v3_v3(gl_diffuse, diffuse);
gl_diffuse[3] = alpha;
copy_v3_v3(gl_specular, specular);
gl_specular[3] = 1.0f;
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diffuse);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
glMateriali(GL_FRONT_AND_BACK, GL_SHININESS, CLAMPIS(shininess, 1, 128));
}
bool GPU_fixed_material_need_normals()
{
return GPU_MATERIAL_STATE.need_normals;
}
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