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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef GRAPHICS_OPENGL_SYSTEM_HEADERS_H
#define GRAPHICS_OPENGL_SYSTEM_HEADERS_H
#include "common/scummsys.h"
// On macOS we only support GL contexts. The reason is that Apple's GL interface
// uses "void *" for GLhandleARB which is not type compatible with GLint. This
// kills our aliasing trick for extension functions and thus would force us to
// supply two different Shader class implementations or introduce other
// wrappers. macOS only supports GL contexts right now anyway (at least
// according to SDL2 sources), thus it is not much of an issue.
#if defined(MACOSX) && (!defined(USE_GLES_MODE) || USE_GLES_MODE != 0)
//#warning "Only forced OpenGL mode is supported on macOS. Overriding settings."
#undef USE_GLES_MODE
#define USE_GLES_MODE 0
#endif
// We allow to force GL or GLES modes on compile time.
// For this the USE_GLES_MODE define is used. The following values represent
// the given selection choices:
// 0 - Force OpenGL context
// 1 - Force OpenGL ES context
// 2 - Force OpenGL ES 2.0 context
#ifdef USE_GLES_MODE
#define USE_FORCED_GL (USE_GLES_MODE == 0)
#define USE_FORCED_GLES (USE_GLES_MODE == 1)
#define USE_FORCED_GLES2 (USE_GLES_MODE == 2)
#else
#define USE_FORCED_GL 0
#define USE_FORCED_GLES 0
#define USE_FORCED_GLES2 0
#endif
// Don't include any OpenGL stuff if we didn't enable it
#ifdef USE_OPENGL
#ifdef USE_GLAD
#include "graphics/opengl/glad.h"
#elif USE_FORCED_GLES2
#define GL_GLEXT_PROTOTYPES
#if defined(IPHONE)
#include <OpenGLES/ES2/gl.h>
#include <OpenGLES/ES2/glext.h>
#else
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#endif
#undef GL_GLEXT_PROTOTYPES
#ifndef GL_BGRA
#define GL_BGRA GL_BGRA_EXT
#endif
#if !defined(GL_UNPACK_ROW_LENGTH)
// The Android SDK does not declare GL_UNPACK_ROW_LENGTH_EXT
#define GL_UNPACK_ROW_LENGTH 0x0CF2
#endif
#if !defined(GL_MAX_SAMPLES)
// The Android SDK and SDL1 don't declare GL_MAX_SAMPLES
#define GL_MAX_SAMPLES 0x8D57
#endif
#if !defined(GL_STACK_OVERFLOW_KHR)
#define GL_STACK_OVERFLOW_KHR 0x0503
#endif
#if !defined(GL_STACK_UNDERFLOW_KHR)
#define GL_STACK_UNDERFLOW_KHR 0x0504
#endif
#elif USE_FORCED_GLES
#define GL_GLEXT_PROTOTYPES
#if defined(IPHONE)
#include <OpenGLES/ES1/gl.h>
#include <OpenGLES/ES1/glext.h>
#else
#include <GLES/gl.h>
#include <GLES/glext.h>
#endif
#undef GL_GLEXT_PROTOTYPES
#endif
#endif
#if !defined(GL_TEXTURE_MAX_LEVEL) && defined(GL_TEXTURE_MAX_LEVEL_APPLE)
#define GL_TEXTURE_MAX_LEVEL GL_TEXTURE_MAX_LEVEL_APPLE
#endif
#endif
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