diff options
Diffstat (limited to 'backends/graphics/opengl/opengl-sys.h')
| -rw-r--r-- | backends/graphics/opengl/opengl-sys.h | 158 |
1 files changed, 135 insertions, 23 deletions
diff --git a/backends/graphics/opengl/opengl-sys.h b/backends/graphics/opengl/opengl-sys.h index a3524b28d2..4495128f32 100644 --- a/backends/graphics/opengl/opengl-sys.h +++ b/backends/graphics/opengl/opengl-sys.h @@ -20,38 +20,150 @@ * */ -#ifndef BACKENDS_GRAPHICS_OPENGL_OPENGL_H -#define BACKENDS_GRAPHICS_OPENGL_OPENGL_H - -// The purpose of this header is to include the OpenGL headers in an uniform -// fashion. A notable example for a non standard port is the Tizen port. +#ifndef BACKENDS_GRAPHICS_OPENGL_OPENGL_SYS_H +#define BACKENDS_GRAPHICS_OPENGL_OPENGL_SYS_H #include "common/scummsys.h" -#ifdef WIN32 -#if defined(ARRAYSIZE) && !defined(_WINDOWS_) -#undef ARRAYSIZE -#endif -#define WIN32_LEAN_AND_MEAN -#include <windows.h> -#undef ARRAYSIZE +#include "backends/graphics/opengl/debug.h" +#ifdef SDL_BACKEND +#include "backends/platform/sdl/sdl-sys.h" #endif -// HACK: In case common/util.h has been included already we need to make sure -// to define ARRAYSIZE again in case of Windows. -#if !defined(ARRAYSIZE) && defined(COMMON_UTIL_H) -#define ARRAYSIZE(x) ((int)(sizeof(x) / sizeof(x[0]))) +// On OS X 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. OS X 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 Mac OS X. 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 +#define USE_FORCED_GL (defined(USE_GLES_MODE) && USE_GLES_MODE == 0) +#define USE_FORCED_GLES (defined(USE_GLES_MODE) && USE_GLES_MODE == 1) +#define USE_FORCED_GLES2 (defined(USE_GLES_MODE) && USE_GLES_MODE == 2) + +// On Tizen we include the toolchain's OpenGL file. This is something we +// actually want to avoid. However, since Tizen uses eglGetProcAddress which +// is not required to return valid function pointers to non OpenGL extension +// functions, we need the system's definitions to resolve all OpenGL +// functions. +// TODO: See if there is an alternative which allows us to avoid including +// Tizen's OpenGL header here. #if defined(TIZEN) -#include <FGraphicsOpengl.h> -using namespace Tizen::Graphics::Opengl; -#elif defined(USE_GLES) -#include <GLES/gl.h> -#elif defined(SDL_BACKEND) -#include <SDL_opengl.h> + #include <FGraphicsOpengl.h> + using namespace Tizen::Graphics::Opengl; + #define USE_BUILTIN_OPENGL #else -#include <GL/gl.h> + #include "backends/graphics/opengl/opengl-defs.h" #endif +#ifdef SDL_BACKEND + // Win32 needs OpenGL functions declared with APIENTRY. + // However, SDL does not define APIENTRY in it's SDL.h file on non-Windows + // targets, thus if it is not available, we just dummy define it. + #ifndef APIENTRY + #define APIENTRY + #endif + #define GL_CALL_CONV APIENTRY +#else + #define GL_CALL_CONV +#endif + +namespace OpenGL { + +enum ContextType { + kContextGL, + kContextGLES, + kContextGLES2 +}; + +class Pipeline; +class Framebuffer; + +/** + * Description structure of the OpenGL (ES) context. + */ +struct Context { + /** The type of the active context. */ + ContextType type; + + /** + * Reset context. + * + * This marks all extensions as unavailable and clears all function + * pointers. + */ + void reset(); + + /** The maximum texture size supported by the context. */ + GLint maxTextureSize; + + /** Whether GL_ARB_texture_non_power_of_two is available or not. */ + bool NPOTSupported; + + /** Whether shader support is available or not. */ + bool shadersSupported; + + /** Whether multi texture support is available or not. */ + bool multitextureSupported; + + /** Whether FBO support is available or not. */ + bool framebufferObjectSupported; + +#define GL_FUNC_DEF(ret, name, param) ret (GL_CALL_CONV *name)param +#include "backends/graphics/opengl/opengl-func.h" +#undef GL_FUNC_DEF + + // + // Wrapper functionality to handle fixed-function pipelines and + // programmable pipelines in the same fashion. + // + +private: + /** Currently active rendering pipeline. */ + Pipeline *activePipeline; + +public: + /** + * Set new pipeline. + * + * Client is responsible for any memory management related to pipelines. + * + * @param pipeline Pipeline to activate. + * @return Formerly active pipeline. + */ + Pipeline *setPipeline(Pipeline *pipeline); + + /** + * Query the currently active rendering pipeline. + */ + Pipeline *getActivePipeline() const { return activePipeline; } +}; + +/** + * The (active) OpenGL context. + */ +extern Context g_context; + +} // End of namespace OpenGL + +#define GL_CALL(x) GL_WRAP_DEBUG(g_context.x, x) +#define GL_CALL_SAFE(func, params) \ + do { \ + if (g_context.func) { \ + GL_CALL(func params); \ + } \ + } while (0) +#define GL_ASSIGN(var, x) GL_WRAP_DEBUG(var = g_context.x, x) + #endif |