136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef BACKENDS_GRAPHICS_OPENGL_OPENGL_SYS_H
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#define BACKENDS_GRAPHICS_OPENGL_OPENGL_SYS_H
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#include "common/scummsys.h"
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#include "graphics/opengl/system_headers.h"
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#include "backends/graphics/opengl/debug.h"
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// This is an addition from us to alias ARB shader object extensions to
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// OpenGL (ES) 2.0 style functions. It only works when GLhandleARB and GLuint
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// are type compatible.
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typedef GLuint GLprogram;
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typedef GLuint GLshader;
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namespace OpenGL {
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enum ContextType {
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kContextGL,
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kContextGLES,
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kContextGLES2
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};
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class Pipeline;
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class Framebuffer;
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/**
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* Description structure of the OpenGL (ES) context.
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*/
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struct Context {
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/** The type of the active context. */
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ContextType type;
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/** Whether the context is initialized or not. */
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bool isInitialized;
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/**
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* Reset context.
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*
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* This marks all extensions as unavailable and clears all function
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* pointers.
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*/
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void reset();
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/** Helper function for checking the GL version supported by the context. */
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inline bool isGLVersionOrHigher(int major, int minor) {
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return ((majorVersion > major) || ((majorVersion == major) && (minorVersion >= minor)));
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}
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/** The GL version supported by the context. */
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int majorVersion, minorVersion;
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/** The maximum texture size supported by the context. */
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GLint maxTextureSize;
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/** Whether GL_ARB_texture_non_power_of_two is available or not. */
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bool NPOTSupported;
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/** Whether shader support is available or not. */
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bool shadersSupported;
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/** Whether multi texture support is available or not. */
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bool multitextureSupported;
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/** Whether FBO support is available or not. */
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bool framebufferObjectSupported;
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/** Whether packed pixels support is available or not. */
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bool packedPixelsSupported;
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/** Whether texture coordinate edge clamping is available or not. */
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bool textureEdgeClampSupported;
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//
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// Wrapper functionality to handle fixed-function pipelines and
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// programmable pipelines in the same fashion.
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//
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private:
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/** Currently active rendering pipeline. */
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Pipeline *activePipeline;
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public:
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/**
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* Set new pipeline.
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*
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* Client is responsible for any memory management related to pipelines.
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*
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* @param pipeline Pipeline to activate.
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* @return Formerly active pipeline.
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*/
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Pipeline *setPipeline(Pipeline *pipeline);
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/**
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* Query the currently active rendering pipeline.
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*/
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Pipeline *getActivePipeline() const { return activePipeline; }
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};
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/**
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* The (active) OpenGL context.
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*/
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extern Context g_context;
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} // End of namespace OpenGL
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#define GL_CALL(x) GL_WRAP_DEBUG(x, x)
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#define GL_CALL_SAFE(func, params) \
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do { \
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if (g_context.isInitialized) { \
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GL_CALL(func params); \
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} \
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} while (0)
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#define GL_ASSIGN(var, x) GL_WRAP_DEBUG(var = x, x)
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#endif
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