145 lines
2.6 KiB
C++
145 lines
2.6 KiB
C++
#include "gl-fun.h"
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#include "boost-hash.h"
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#include "exception.h"
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#include <SDL_video.h>
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#include <string>
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GLFunctions gl;
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typedef const GLubyte* (APIENTRYP PFNGLGETSTRINGIPROC) (GLenum, GLuint);
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static void parseExtensionsCore(PFNGLGETINTEGERVPROC GetIntegerv, BoostSet<std::string> &out)
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{
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PFNGLGETSTRINGIPROC GetStringi =
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(PFNGLGETSTRINGIPROC) SDL_GL_GetProcAddress("glGetStringi");
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GLint extCount = 0;
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GetIntegerv(GL_NUM_EXTENSIONS, &extCount);
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for (GLint i = 0; i < extCount; ++i)
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out.insert((const char*) GetStringi(GL_EXTENSIONS, i));
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}
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static void parseExtensionsCompat(PFNGLGETSTRINGPROC GetString, BoostSet<std::string> &out)
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{
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const char *ext = (const char*) GetString(GL_EXTENSIONS);
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if (!ext)
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return;
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char buffer[0x100];
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size_t bufferI;
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while (*ext)
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{
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bufferI = 0;
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while (*ext && *ext != ' ')
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buffer[bufferI++] = *ext++;
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buffer[bufferI] = '\0';
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out.insert(buffer);
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if (*ext == ' ')
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++ext;
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}
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}
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#define GL_FUN(name, type) \
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gl.name = (type) SDL_GL_GetProcAddress("gl" #name EXT_SUFFIX);
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#define EXC(msg) \
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Exception(Exception::MKXPError, "%s", msg)
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void initGLFunctions()
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{
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#define EXT_SUFFIX ""
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GL_20_FUN;
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/* Determine GL version */
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const char *ver = (const char*) gl.GetString(GL_VERSION);
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/* Assume single digit */
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int glMajor = *ver - '0';
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if (glMajor < 2)
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throw EXC("At least OpenGL 2.0 is required");
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BoostSet<std::string> ext;
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if (glMajor >= 3)
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parseExtensionsCore(gl.GetIntegerv, ext);
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else
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parseExtensionsCompat(gl.GetString, ext);
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#define HAVE_EXT(_ext) ext.contains("GL_" #_ext)
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if (!HAVE_EXT(ARB_framebuffer_object))
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{
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if (!(HAVE_EXT(EXT_framebuffer_object) && HAVE_EXT(EXT_framebuffer_blit)))
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throw EXC("No FBO extensions available");
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#undef EXT_SUFFIX
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#define EXT_SUFFIX "EXT"
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GL_FBO_FUN;
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}
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else
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{
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#undef EXT_SUFFIX
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#define EXT_SUFFIX ""
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GL_FBO_FUN;
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}
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if (!HAVE_EXT(ARB_vertex_array_object))
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{
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if (!HAVE_EXT(APPLE_vertex_array_object))
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throw EXC("No VAO extensions available");
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#undef EXT_SUFFIX
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#define EXT_SUFFIX "APPLE"
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GL_VAO_FUN;
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}
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else
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{
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#undef EXT_SUFFIX
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#define EXT_SUFFIX ""
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GL_VAO_FUN;
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}
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if (HAVE_EXT(ARB_timer_query))
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{
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gl.timerQuery = true;
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#undef EXT_SUFFIX
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#define EXT_SUFFIX ""
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GL_TIMER_QUERY_FUN;
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}
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else if (HAVE_EXT(EXT_timer_query))
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{
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gl.timerQuery = true;
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#undef EXT_SUFFIX
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#define EXT_SUFFIX "EXT"
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GL_TIMER_QUERY_FUN;
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}
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else
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{
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gl.timerQuery = false;
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}
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if (HAVE_EXT(KHR_debug))
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{
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#undef EXT_SUFFIX
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#define EXT_SUFFIX ""
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GL_DEBUG_KHR_FUN;
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}
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else if (HAVE_EXT(ARB_debug_output))
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{
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#undef EXT_SUFFIX
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#define EXT_SUFFIX "ARB"
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GL_DEBUG_KHR_FUN;
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}
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}
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