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glcolorconvert: mangle gl_FragColor for GL3

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Some drivers don't provide the compatibility definition and we need to provide
our own 'out vec4' variable to put the results of the fragment shader into.

https://bugzilla.gnome.org/show_bug.cgi?id=757938
This commit is contained in:
Matthew Waters 2015-11-11 23:39:35 +11:00 committed by Tim-Philipp Müller
parent 2c4a14f7c7
commit b30deff7e1
1 changed files with 23 additions and 0 deletions
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23
gst-libs/gst/gl/gstglcolorconvert.c
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@ -1515,6 +1515,19 @@ _mangle_varying_attribute (const gchar * str, guint shader_type,
return g_strdup (str);
}
static gchar *
_mangle_frag_color (const gchar * str)
{
GRegex *regex;
gchar *ret;
regex = g_regex_new ("gl_FragColor", 0, 0, NULL);
ret = g_regex_replace_literal (regex, str, -1, 0, "fragColor", 0, NULL);
g_regex_unref (regex);
return ret;
}
static void
_mangle_version_profile_from_gl_api (GstGLAPI gl_api, GstGLSLVersion * version,
GstGLSLProfile * profile)
@ -1543,6 +1556,11 @@ _mangle_shader (const gchar * str, guint shader_type, GstGLTextureTarget from,
g_free (tmp);
tmp = _mangle_varying_attribute (tmp2, shader_type, gl_api);
g_free (tmp2);
if (shader_type == GL_FRAGMENT_SHADER && gl_api & GST_GL_API_OPENGL3) {
tmp2 = _mangle_frag_color (tmp);
g_free (tmp);
tmp = tmp2;
}
_mangle_version_profile_from_gl_api (gl_api, version, profile);
return tmp;
}
@ -1605,6 +1623,11 @@ _create_shader (GstGLColorConvert * convert)
if (info->templ->uniforms)
g_string_append (str, info->templ->uniforms);
if (gl_api & GST_GL_API_OPENGL3) {
g_string_append_c (str, '\n');
g_string_append (str, "out vec4 fragColor;\n");
}
for (i = 0; i < MAX_FUNCTIONS; i++) {
if (info->templ->functions[i] == NULL)
break;