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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 "internal.h"
#include <stdio.h>
#include <string.h> #include <string.h>
#include <limits.h> #include <limits.h>
@ -40,47 +41,38 @@
static GLboolean parseGLVersion(int* major, int* minor, int* rev) static GLboolean parseGLVersion(int* major, int* minor, int* rev)
{ {
GLuint _major, _minor = 0, _rev = 0; int i, _major, _minor = 0, _rev = 0;
const GLubyte* version; const char* version;
const GLubyte* ptr; const char* prefixes[] =
const char* glesPrefix = "OpenGL ES "; {
"OpenGL ES ",
NULL
};
version = glGetString(GL_VERSION); version = (const char*) glGetString(GL_VERSION);
if (!version) if (!version)
{ {
_glfwSetError(GLFW_PLATFORM_ERROR, "Failed to retrieve version string"); _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 const size_t length = strlen(prefixes[i]);
// number, so we skip past it and then continue as normal
version += strlen(glesPrefix); if (strncmp(version, prefixes[i], length) == 0)
}
// 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 == '.')
{ {
ptr++; version += length;
for (_rev = 0; *ptr >= '0' && *ptr <= '9'; ptr++) break;
_rev = 10 * _rev + (*ptr - '0');
} }
} }
// 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; *major = _major;
*minor = _minor; *minor = _minor;
*rev = _rev; *rev = _rev;