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Imported version parsing from EGL branch.

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This commit is contained in:
Camilla Berglund 2012-08-02 14:48:06 +02:00
parent 59896c327a
commit 208377d08e
1 changed files with 21 additions and 29 deletions
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50
src/opengl.c
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@ -30,6 +30,7 @@
#include "internal.h"
#include <stdio.h>
#include <string.h>
#include <limits.h>
@ -40,47 +41,38 @@
static GLboolean parseGLVersion(int* major, int* minor, int* rev)
{
GLuint _major, _minor = 0, _rev = 0;
const GLubyte* version;
const GLubyte* ptr;
const char* glesPrefix = "OpenGL ES ";
int i, _major, _minor = 0, _rev = 0;
const char* version;
const char* prefixes[] =
{
"OpenGL ES ",
NULL
};
version = glGetString(GL_VERSION);
version = (const char*) glGetString(GL_VERSION);
if (!version)
{
_glfwSetError(GLFW_PLATFORM_ERROR, "Failed to retrieve version string");
return;
return GL_FALSE;
}
if (strncmp((const char*) version, glesPrefix, strlen(glesPrefix)) == 0)
for (i = 0; prefixes[i]; i++)
{
// The version string on OpenGL ES has a prefix before the version
// number, so we skip past it and then continue as normal
const size_t length = strlen(prefixes[i]);
version += strlen(glesPrefix);
}
// Parse version from string
ptr = version;
for (_major = 0; *ptr >= '0' && *ptr <= '9'; ptr++)
_major = 10 * _major + (*ptr - '0');
if (*ptr == '.')
{
ptr++;
for (_minor = 0; *ptr >= '0' && *ptr <= '9'; ptr++)
_minor = 10 * _minor + (*ptr - '0');
if (*ptr == '.')
if (strncmp(version, prefixes[i], length) == 0)
{
ptr++;
for (_rev = 0; *ptr >= '0' && *ptr <= '9'; ptr++)
_rev = 10 * _rev + (*ptr - '0');
version += length;
break;
}
}
// Store result
if (!sscanf(version, "%d.%d.%d", &_major, &_minor, &_rev))
{
_glfwSetError(GLFW_PLATFORM_ERROR, "No version found in version string");
return GL_FALSE;
}
*major = _major;
*minor = _minor;
*rev = _rev;