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57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
#include "opengl.h"
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#include <assert.h>
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#include <stdio.h>
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#include "SDL2/SDL.h"
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void
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sc_opengl_init(struct sc_opengl *gl) {
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gl->GetString = SDL_GL_GetProcAddress("glGetString");
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assert(gl->GetString);
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gl->TexParameterf = SDL_GL_GetProcAddress("glTexParameterf");
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assert(gl->TexParameterf);
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gl->TexParameteri = SDL_GL_GetProcAddress("glTexParameteri");
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assert(gl->TexParameteri);
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// optional
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gl->GenerateMipmap = SDL_GL_GetProcAddress("glGenerateMipmap");
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const char *version = (const char *) gl->GetString(GL_VERSION);
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assert(version);
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gl->version = version;
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#define OPENGL_ES_PREFIX "OpenGL ES "
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/* starts with "OpenGL ES " */
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gl->is_opengles = !strncmp(gl->version, OPENGL_ES_PREFIX,
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sizeof(OPENGL_ES_PREFIX) - 1);
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if (gl->is_opengles) {
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/* skip the prefix */
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version += sizeof(PREFIX) - 1;
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}
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int r = sscanf(version, "%d.%d", &gl->version_major, &gl->version_minor);
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if (r != 2) {
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// failed to parse the version
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gl->version_major = 0;
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gl->version_minor = 0;
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}
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}
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bool
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sc_opengl_version_at_least(struct sc_opengl *gl,
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int minver_major, int minver_minor,
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int minver_es_major, int minver_es_minor)
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{
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if (gl->is_opengles) {
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return gl->version_major > minver_es_major
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|| (gl->version_major == minver_es_major
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&& gl->version_minor >= minver_es_minor);
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}
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return gl->version_major > minver_major
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|| (gl->version_major == minver_major
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&& gl->version_minor >= minver_minor);
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}
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