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libs: add gl_get_current_api()

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In order to know which OpenGL API use, we must detect the API type of current
context. This patch adds the function gl_get_current_api() which returns the
OpenGL API type.

This function is an adaptation of gst_gl_context_get_current_gl_api() from
GstGL.

Signed-off-by: Víctor Manuel Jáquez Leal <victorx.jaquez@intel.com>

https://bugzilla.gnome.org/show_bug.cgi?id=753099
This commit is contained in:
Víctor Manuel Jáquez Leal 2015-11-26 10:14:45 +01:00
parent d7bd0a4c10
commit 03fed576f0
2 changed files with 103 additions and 0 deletions
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89
gst-libs/gst/vaapi/gstvaapiutils_glx.c
View file

@ -1087,3 +1087,92 @@ gl_unbind_framebuffer_object (GLFramebufferObject * fbo)
fbo->is_bound = FALSE;
return TRUE;
}
/**
* gl_get_current_api:
* @major: (out): (allow-none): the GL major version
* @minor: (out): (allow-none): the GL minor version
*
* If an error occurs, @major and @minor aren't modified and
* %GST_VAAPI_GL_API_NONE is returned.
*
* This is an adaptation of gst_gl_context_get_current_gl_api() from GstGL.
*
* Returns: The version supported by the OpenGL context current in the calling
* thread or %GST_VAAPI_GL_API_NONE
*/
GstVaapiGLApi
gl_get_current_api (guint * major, guint * minor)
{
const gchar *version;
gint maj, min, n;
GstVaapiGLApi ret = (1 << 31);
while (ret != GST_VAAPI_GL_API_NONE) {
version = (const gchar *) glGetString (GL_VERSION);
if (!version)
goto next;
/* strlen (x.x) == 3 */
n = strlen (version);
if (n < 3)
goto next;
if (g_strstr_len (version, 9, "OpenGL ES")) {
/* strlen (OpenGL ES x.x) == 13 */
if (n < 13)
goto next;
sscanf (&version[10], "%d.%d", &maj, &min);
if (maj <= 0 || min < 0)
goto next;
if (maj == 1) {
ret = GST_VAAPI_GL_API_GLES1;
break;
} else if (maj == 2 || maj == 3) {
ret = GST_VAAPI_GL_API_GLES2;
break;
}
goto next;
} else {
sscanf (version, "%d.%d", &maj, &min);
if (maj <= 0 || min < 0)
goto next;
if (maj > 3 || (maj == 3 && min > 1)) {
GLuint context_flags = 0;
ret = GST_VAAPI_GL_API_NONE;
if (!gl_get_param (GL_CONTEXT_PROFILE_MASK, &context_flags))
break;
if (context_flags & GL_CONTEXT_CORE_PROFILE_BIT)
ret |= GST_VAAPI_GL_API_OPENGL3;
if (context_flags & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
ret |= GST_VAAPI_GL_API_OPENGL;
break;
}
ret = GST_VAAPI_GL_API_OPENGL;
break;
}
next:
/* iterate through the apis */
ret >>= 1;
}
if (ret == GST_VAAPI_GL_API_NONE)
return GST_VAAPI_GL_API_NONE;
if (major)
*major = maj;
if (minor)
*minor = min;
return ret;
}

14
gst-libs/gst/vaapi/gstvaapiutils_glx.h
View file

@ -210,4 +210,18 @@ G_GNUC_INTERNAL
gboolean
gl_unbind_framebuffer_object (GLFramebufferObject * fbo);
typedef enum {
GST_VAAPI_GL_API_NONE = 0,
GST_VAAPI_GL_API_OPENGL = (1 << 0),
GST_VAAPI_GL_API_OPENGL3 = (1 << 1),
GST_VAAPI_GL_API_GLES1 = (1 << 15),
GST_VAAPI_GL_API_GLES2 = (1 << 16),
GST_VAAPI_GL_API_ANY = G_MAXUINT32
} GstVaapiGLApi;
G_GNUC_INTERNAL
GstVaapiGLApi
gl_get_current_api (guint * major, guint * minor);
#endif /* GST_VAAPI_UTILS_GLX_H */