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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 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.
*
*/
#include "backends/graphics/opengl/opengl-sys.h"
#include "backends/graphics/opengl/opengl-graphics.h"
#include "backends/graphics/opengl/shader.h"
#include "backends/graphics/opengl/pipeline.h"
#include "backends/graphics/opengl/framebuffer.h"
#include "common/tokenizer.h"
#include "common/debug.h"
namespace OpenGL {
void Context::reset() {
maxTextureSize = 0;
NPOTSupported = false;
shadersSupported = false;
multitextureSupported = false;
framebufferObjectSupported = false;
#define GL_FUNC_DEF(ret, name, param) name = nullptr;
#include "backends/graphics/opengl/opengl-func.h"
#undef GL_FUNC_DEF
activePipeline = nullptr;
}
Pipeline *Context::setPipeline(Pipeline *pipeline) {
Pipeline *oldPipeline = activePipeline;
activePipeline = pipeline;
if (activePipeline) {
activePipeline->activate();
}
return oldPipeline;
}
Context g_context;
void OpenGLGraphicsManager::setContextType(ContextType type) {
#if USE_FORCED_GL
type = kContextGL;
#elif USE_FORCED_GLES
type = kContextGLES;
#elif USE_FORCED_GLES2
type = kContextGLES2;
#endif
g_context.type = type;
}
void OpenGLGraphicsManager::initializeGLContext() {
// Initialize default state.
g_context.reset();
// Load all functions.
// We use horrible trickery to silence C++ compilers.
// See backends/plugins/sdl/sdl-provider.cpp for more information.
assert(sizeof(void (*)()) == sizeof(void *));
void *fn = nullptr;
#define LOAD_FUNC(name, loadName) \
fn = getProcAddress(#loadName); \
memcpy(&g_context.name, &fn, sizeof(fn))
#define GL_EXT_FUNC_DEF(ret, name, param) LOAD_FUNC(name, name)
#ifdef USE_BUILTIN_OPENGL
#define GL_FUNC_DEF(ret, name, param) g_context.name = &name
#define GL_FUNC_2_DEF GL_FUNC_DEF
#else
#define GL_FUNC_DEF GL_EXT_FUNC_DEF
#define GL_FUNC_2_DEF(ret, name, extName, param) \
if (g_context.type == kContextGL) { \
LOAD_FUNC(name, extName); \
} else { \
LOAD_FUNC(name, name); \
}
#endif
#include "backends/graphics/opengl/opengl-func.h"
#undef GL_FUNC_2_DEF
#undef GL_FUNC_DEF
#undef GL_EXT_FUNC_DEF
#undef LOAD_FUNC
// Obtain maximum texture size.
GL_CALL(glGetIntegerv(GL_MAX_TEXTURE_SIZE, &g_context.maxTextureSize));
debug(5, "OpenGL maximum texture size: %d", g_context.maxTextureSize);
const char *extString = (const char *)g_context.glGetString(GL_EXTENSIONS);
bool ARBShaderObjects = false;
bool ARBShadingLanguage100 = false;
bool ARBVertexShader = false;
bool ARBFragmentShader = false;
Common::StringTokenizer tokenizer(extString, " ");
while (!tokenizer.empty()) {
Common::String token = tokenizer.nextToken();
if (token == "GL_ARB_texture_non_power_of_two" || token == "GL_OES_texture_npot") {
g_context.NPOTSupported = true;
} else if (token == "GL_ARB_shader_objects") {
ARBShaderObjects = true;
} else if (token == "GL_ARB_shading_language_100") {
ARBShadingLanguage100 = true;
} else if (token == "GL_ARB_vertex_shader") {
ARBVertexShader = true;
} else if (token == "GL_ARB_fragment_shader") {
ARBFragmentShader = true;
} else if (token == "GL_ARB_multitexture") {
g_context.multitextureSupported = true;
} else if (token == "GL_EXT_framebuffer_object") {
g_context.framebufferObjectSupported = true;
}
}
if (g_context.type == kContextGLES2) {
// GLES2 always has (limited) NPOT support.
g_context.NPOTSupported = true;
// GLES2 always has shader support.
g_context.shadersSupported = true;
// GLES2 always has multi texture support.
g_context.multitextureSupported = true;
// GLES2 always has FBO support.
g_context.framebufferObjectSupported = true;
} else {
g_context.shadersSupported = ARBShaderObjects & ARBShadingLanguage100 & ARBVertexShader & ARBFragmentShader;
}
// Log context type.
switch (g_context.type) {
case kContextGL:
debug(5, "OpenGL: GL context initialized");
break;
case kContextGLES:
debug(5, "OpenGL: GLES context initialized");
break;
case kContextGLES2:
debug(5, "OpenGL: GLES2 context initialized");
break;
}
// Log features supported by GL context.
debug(5, "OpenGL: NPOT texture support: %d", g_context.NPOTSupported);
debug(5, "OpenGL: Shader support: %d", g_context.shadersSupported);
debug(5, "OpenGL: Multitexture support: %d", g_context.multitextureSupported);
debug(5, "OpenGL: FBO support: %d", g_context.framebufferObjectSupported);
}
} // End of namespace OpenGL
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