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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): Jason Wilkins.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/gpu/intern/gpu_state_latch.c
* \ingroup gpu
*/
#define GPU_MANGLE_DEPRECATED 0
/* my interface */
#include "intern/gpu_state_latch_intern.h"
/* my library */
#include "gpu_profile.h"
#include "GPU_safety.h"
/* internal */
#include "intern/gpu_profile.h"
/* external */
#include "BLI_sys_types.h"
#include "BLI_utildefines.h"
/* standard */
#include <string.h>
// XXX jwilkins: this needs to be made to save these values from different contexts
static bool depth_range_valid = false;
static GLdouble depth_range[2];
static bool viewport_valid = false;
static GLint viewport[4];
static bool texture_binding_2D_valid = false;
static GLuint texture_binding_2D;
static bool depth_writemask_valid = false;
static GLboolean depth_writemask;
void gpu_state_latch_init(void)
{
#if defined(WITH_GL_PROFILE_COMPAT)
GLint value;
glGetDoublev(GL_DEPTH_RANGE, depth_range);
depth_range_valid = true;
glGetIntegerv(GL_VIEWPORT, viewport);
viewport_valid = true;
value = 0;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &value);
texture_binding_2D = (GLuint)value;
texture_binding_2D_valid = true;
glGetBooleanv(GL_DEPTH_WRITEMASK, &depth_writemask);
depth_writemask_valid = true;
#else
depth_range_valid = false;
viewport_valid = false;
texture_binding_2D_valid = false;
depth_writemask_valid = false;
#endif
}
void gpu_state_latch_exit(void)
{
}
void gpuDepthRange(GLdouble near, GLdouble far)
{
GPU_ASSERT(near != far);
VEC2D(depth_range, near, far);
depth_range_valid = true;
#if !defined(GLEW_ES_ONLY)
if (!GPU_PROFILE_ES20) {
GPU_CHECK(glDepthRange(near, far));
return;
}
#endif
#if !defined(GLEW_NO_ES)
if (GPU_PROFILE_ES20) {
GPU_CHECK(glDepthRangef((GLfloat)near, (GLfloat)far));
return;
}
#endif
}
void gpuGetDepthRange(GLdouble out[2])
{
GPU_ASSERT(depth_range_valid);
VECCOPY2D(out, depth_range);
}
GLfloat GPU_feedback_depth_range(GLfloat z)
{
GLfloat depth;
GPU_ASSERT(depth_range_valid);
depth = depth_range[1] - depth_range[0];
if (depth != 0) {
return z / depth;
}
else {
GPU_ABORT();
return z;
}
}
void gpuBindTexture(GLenum target, GLuint name)
{
switch(target)
{
case GL_TEXTURE_2D:
texture_binding_2D = name;
texture_binding_2D_valid = true;
break;
default:
/* a target we don't care to latch */
break;
}
GPU_CHECK(glBindTexture(target, name));
}
GLuint gpuGetTextureBinding2D(void)
{
GPU_ASSERT(texture_binding_2D_valid);
return texture_binding_2D;
}
void gpuDepthMask(GLboolean flag)
{
depth_writemask = flag;
depth_writemask_valid = true;
GPU_CHECK(glDepthMask(flag));
}
GLboolean gpuGetDepthWriteMask(void)
{
GPU_ASSERT(depth_writemask_valid);
return depth_writemask;
}
void gpuViewport(int x, int y, int width, int height)
{
viewport[0] = x;
viewport[1] = y;
viewport[2] = width;
viewport[3] = height;
viewport_valid = true;
GPU_CHECK(glViewport(x, y, width, height));
}
void gpuGetViewport(int out[4])
{
GPU_ASSERT(viewport_valid);
VECCOPY4D(out, viewport);
}
void GPU_feedback_viewport_2fv(GLfloat x, GLfloat y, GLfloat out[2])
{
const GLfloat halfw = (GLfloat)viewport[2] / 2.0f;
const GLfloat halfh = (GLfloat)viewport[3] / 2.0f;
GPU_ASSERT(viewport_valid);
out[0] = halfw*x + halfw + (GLfloat)viewport[0];
out[1] = halfh*y + halfh + (GLfloat)viewport[1];
}
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