qzdoom/src/gl/system/gl_interface.cpp

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/*
** r_opengl.cpp
**
** OpenGL system interface
**
**---------------------------------------------------------------------------
** Copyright 2005 Tim Stump
** Copyright 2005-2013 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
** 4. Full disclosure of the entire project's source code, except for third
** party libraries is mandatory. (NOTE: This clause is non-negotiable!)
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include "gl/system/gl_system.h"
#include "tarray.h"
#include "doomtype.h"
#include "m_argv.h"
#include "zstring.h"
#include "version.h"
#include "i_system.h"
#include "v_text.h"
#include "gl/system/gl_interface.h"
#include "gl/system/gl_cvars.h"
static TArray<FString> m_Extensions;
RenderContext gl;
int occlusion_type=0;
//==========================================================================
//
//
//
//==========================================================================
static void CollectExtensions()
{
const char *supported = NULL;
char *extensions, *extension;
supported = (char *)glGetString(GL_EXTENSIONS);
if (supported)
{
extensions = new char[strlen(supported) + 1];
strcpy(extensions, supported);
extension = strtok(extensions, " ");
while(extension)
{
m_Extensions.Push(FString(extension));
extension = strtok(NULL, " ");
}
delete [] extensions;
}
}
//==========================================================================
//
//
//
//==========================================================================
static bool CheckExtension(const char *ext)
{
for (unsigned int i = 0; i < m_Extensions.Size(); ++i)
{
if (m_Extensions[i].CompareNoCase(ext) == 0) return true;
}
return false;
}
//==========================================================================
//
//
//
//==========================================================================
static void InitContext()
{
gl.flags=0;
}
//==========================================================================
//
//
//
//==========================================================================
void gl_LoadExtensions()
{
InitContext();
CollectExtensions();
const char *version = Args->CheckValue("-glversion");
if (version == NULL) version = (const char*)glGetString(GL_VERSION);
else Printf("Emulating OpenGL v %s\n", version);
// Don't even start if it's lower than 3.0
if (strcmp(version, "3.0") < 0)
{
I_FatalError("Unsupported OpenGL version.\nAt least GL 3.0 is required to run " GAMENAME ".\n");
}
gl.version = strtod(version, NULL);
gl.glslversion = strtod((char*)glGetString(GL_SHADING_LANGUAGE_VERSION), NULL);
gl.vendorstring=(char*)glGetString(GL_VENDOR);
if (CheckExtension("GL_ARB_texture_compression")) gl.flags|=RFL_TEXTURE_COMPRESSION;
if (CheckExtension("GL_EXT_texture_compression_s3tc")) gl.flags|=RFL_TEXTURE_COMPRESSION_S3TC;
if (gl.version >= 4.f && CheckExtension("GL_ARB_buffer_storage")) gl.flags |= RFL_BUFFER_STORAGE;
glGetIntegerv(GL_MAX_TEXTURE_SIZE,&gl.max_texturesize);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
}
//==========================================================================
//
//
//
//==========================================================================
void gl_PrintStartupLog()
{
Printf ("GL_VENDOR: %s\n", glGetString(GL_VENDOR));
Printf ("GL_RENDERER: %s\n", glGetString(GL_RENDERER));
Printf ("GL_VERSION: %s\n", glGetString(GL_VERSION));
Printf ("GL_SHADING_LANGUAGE_VERSION: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));
Printf ("GL_EXTENSIONS: %s\n", glGetString(GL_EXTENSIONS));
int v;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &v);
Printf("Max. texture size: %d\n", v);
glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &v);
Printf ("Max. texture units: %d\n", v);
glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &v);
Printf ("Max. fragment uniforms: %d\n", v);
gl.maxuniforms = v;
glGetIntegerv(GL_MAX_VERTEX_UNIFORM_COMPONENTS, &v);
Printf ("Max. vertex uniforms: %d\n", v);
glGetIntegerv(GL_MAX_VARYING_FLOATS, &v);
Printf ("Max. varying: %d\n", v);
glGetIntegerv(GL_MAX_COMBINED_SHADER_STORAGE_BLOCKS, &v);
Printf("Max. combined shader storage blocks: %d\n", v);
glGetIntegerv(GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, &v);
Printf("Max. vertex shader storage blocks: %d\n", v);
}