gstreamer/gst-libs/gst/gl/gstglsl.c
Matthew Waters 98249a57db gst: don't use volatile to mean atomic
volatile is not sufficient to provide atomic guarantees and real atomics
should be used instead.  GCC 11 has started warning about using volatile
with atomic operations.

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719

Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1073>
2021-03-19 04:20:19 +00:00

996 lines
27 KiB
C

/*
* GStreamer
* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gl/gl.h>
#include "gstglsl.h"
#include "gstglsl_private.h"
/**
* SECTION:gstglsl
* @title: GstGLSL
* @short_description: helpers for dealing with OpenGL shaders
* @see_also: #GstGLSLStage, #GstGLShader
*/
#define GST_CAT_DEFAULT gst_glsl_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static void
_init_debug (void)
{
static gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glsl", 0,
"OpenGL Shading Language");
g_once_init_leave (&_init, 1);
}
}
/**
* gst_glsl_error_quark:
*
* Returns: the quark used for GstGLSL in #GError's
*/
GQuark
gst_glsl_error_quark (void)
{
return g_quark_from_static_string ("gst-glsl-error-quark");
}
struct glsl_version_string
{
GstGLSLVersion version;
const gchar *name;
};
static const struct glsl_version_string glsl_versions[] = {
/* keep in sync with definition in the header */
{GST_GLSL_VERSION_100, "100"},
{GST_GLSL_VERSION_110, "110"},
{GST_GLSL_VERSION_120, "120"},
{GST_GLSL_VERSION_130, "130"},
{GST_GLSL_VERSION_140, "140"},
{GST_GLSL_VERSION_150, "150"},
{GST_GLSL_VERSION_300, "300"},
{GST_GLSL_VERSION_310, "310"},
{GST_GLSL_VERSION_320, "320"},
{GST_GLSL_VERSION_330, "330"},
{GST_GLSL_VERSION_400, "400"},
{GST_GLSL_VERSION_410, "410"},
{GST_GLSL_VERSION_420, "420"},
{GST_GLSL_VERSION_430, "430"},
{GST_GLSL_VERSION_440, "440"},
{GST_GLSL_VERSION_450, "450"},
};
struct glsl_profile_string
{
GstGLSLProfile profile;
const gchar *name;
};
static const struct glsl_profile_string glsl_profiles[] = {
/* keep in sync with definition in the header */
{GST_GLSL_PROFILE_ES, "es"},
{GST_GLSL_PROFILE_CORE, "core"},
{GST_GLSL_PROFILE_COMPATIBILITY, "compatibility"},
};
/**
* gst_glsl_version_to_string:
* @version: a #GstGLSLVersion
*
* Returns: (nullable): the name of @version or %NULL on error
*/
const gchar *
gst_glsl_version_to_string (GstGLSLVersion version)
{
int i;
if (version == GST_GLSL_VERSION_NONE)
return NULL;
for (i = 0; i < G_N_ELEMENTS (glsl_versions); i++) {
if (version == glsl_versions[i].version)
return glsl_versions[i].name;
}
return NULL;
}
/**
* gst_glsl_version_from_string:
* @string: a GLSL version string
*
* Returns: the #GstGLSLVersion of @string or %GST_GLSL_VERSION_NONE on error
*/
GstGLSLVersion
gst_glsl_version_from_string (const gchar * string)
{
gchar *str;
int i;
if (string == NULL)
return 0;
str = g_strdup (string);
str = g_strstrip (str);
for (i = 0; i < G_N_ELEMENTS (glsl_versions); i++) {
if (g_strcmp0 (str, glsl_versions[i].name) == 0) {
g_free (str);
return glsl_versions[i].version;
}
}
g_free (str);
return 0;
}
/**
* gst_glsl_profile_to_string:
* @profile: a #GstGLSLProfile
*
* Returns: (nullable): the name for @profile or %NULL on error
*/
const gchar *
gst_glsl_profile_to_string (GstGLSLProfile profile)
{
int i;
if (profile == GST_GLSL_PROFILE_NONE)
return NULL;
/* multiple profiles are not allowed */
if ((profile & (profile - 1)) != 0)
return NULL;
for (i = 0; i < G_N_ELEMENTS (glsl_profiles); i++) {
if (profile == glsl_profiles[i].profile)
return glsl_profiles[i].name;
}
return NULL;
}
/**
* gst_glsl_profile_from_string:
* @string: a GLSL version string
*
* Returns: the #GstGLSLProfile of @string or %GST_GLSL_PROFILE_NONE on error
*/
GstGLSLProfile
gst_glsl_profile_from_string (const gchar * string)
{
gchar *str;
int i;
if (string == NULL)
return GST_GLSL_PROFILE_NONE;
str = g_strdup (string);
str = g_strstrip (str);
for (i = 0; i < G_N_ELEMENTS (glsl_profiles); i++) {
if (g_strcmp0 (str, glsl_profiles[i].name) == 0) {
g_free (str);
return glsl_profiles[i].profile;
}
}
g_free (str);
return GST_GLSL_PROFILE_NONE;
}
static gboolean
_is_valid_version_profile (GstGLSLVersion version, GstGLSLProfile profile)
{
if (version == GST_GLSL_VERSION_NONE)
return TRUE;
/* versions that may not need an explicit profile */
if (version <= GST_GLSL_VERSION_150 && profile == GST_GLSL_PROFILE_NONE)
return TRUE;
/* ES versions require an ES profile */
if (version == GST_GLSL_VERSION_100 || version == GST_GLSL_VERSION_300
|| version == GST_GLSL_VERSION_310 || version == GST_GLSL_VERSION_320)
return profile == GST_GLSL_PROFILE_ES;
/* required profile and no ES profile for normal GL contexts */
if (version == GST_GLSL_VERSION_150 || version >= GST_GLSL_VERSION_330)
return profile == GST_GLSL_PROFILE_NONE || profile == GST_GLSL_PROFILE_CORE
|| profile == GST_GLSL_PROFILE_COMPATIBILITY;
if (version <= GST_GLSL_VERSION_140)
return profile == GST_GLSL_PROFILE_NONE
|| profile == GST_GLSL_PROFILE_COMPATIBILITY;
return FALSE;
}
/**
* gst_glsl_version_profile_to_string:
* @version: a #GstGLSLVersion
* @profile: a #GstGLSLVersion
*
* Returns: the combined GLSL `#version` string for @version and @profile
*/
gchar *
gst_glsl_version_profile_to_string (GstGLSLVersion version,
GstGLSLProfile profile)
{
const gchar *version_s, *profile_s;
if (!_is_valid_version_profile (version, profile))
return NULL;
version_s = gst_glsl_version_to_string (version);
/* no profiles in GL/ES <= 150 */
if (version <= GST_GLSL_VERSION_140)
profile_s = NULL;
else
profile_s = gst_glsl_profile_to_string (profile);
if (!version_s)
return NULL;
if (profile_s)
return g_strdup_printf ("%s %s", version_s, profile_s);
return g_strdup (version_s);
}
static void
_fixup_version_profile (GstGLSLVersion * version, GstGLSLProfile * profile)
{
if (*version == GST_GLSL_VERSION_100 || *version == GST_GLSL_VERSION_300
|| *version == GST_GLSL_VERSION_310 || *version == GST_GLSL_VERSION_320)
*profile = GST_GLSL_PROFILE_ES;
else if (*version <= GST_GLSL_VERSION_140)
*profile = GST_GLSL_PROFILE_COMPATIBILITY;
else if (*profile == GST_GLSL_PROFILE_NONE
&& (*version >= GST_GLSL_VERSION_150 || *version >= GST_GLSL_VERSION_330))
*profile = GST_GLSL_PROFILE_CORE;
}
/* @str points to the start of "#version", "# version" or "#\tversion", etc */
static const gchar *
_check_valid_version_preprocessor_string (const gchar * str)
{
gint i = 0;
if (!str || !str[i])
return NULL;
/* there can be whitespace between the '#' and 'version' */
do {
i++;
if (str[i] == '\0' || str[i] == '\n' || str[i] == '\r')
return NULL;
} while (g_ascii_isspace (str[i]));
if (g_strstr_len (&str[i], 7, "version"))
return &str[i + 7];
return NULL;
}
/**
* gst_glsl_version_profile_from_string:
* @string: a valid GLSL `#version` string
* @version_ret: (out): resulting #GstGLSLVersion
* @profile_ret: (out): resulting #GstGLSLVersion
*
* Note: this function expects either a `#version` GLSL preprocesser directive
* or a valid GLSL version and/or profile.
*
* Returns: TRUE if a valid `#version` string was found, FALSE otherwise
*/
gboolean
gst_glsl_version_profile_from_string (const gchar * string,
GstGLSLVersion * version_ret, GstGLSLProfile * profile_ret)
{
gchar *str, *version_s, *profile_s;
GstGLSLVersion version = GST_GLSL_VERSION_NONE;
GstGLSLProfile profile = GST_GLSL_PROFILE_NONE;
gint i;
_init_debug ();
if (!string)
goto error;
str = g_strdup (string);
version_s = g_strstrip (str);
/* skip possible #version prefix */
if (str[0] == '#') {
if (!(version_s =
(gchar *) _check_valid_version_preprocessor_string (version_s))) {
GST_WARNING ("Invalid preprocesser directive detected");
g_free (str);
goto error;
}
}
version_s = g_strstrip (version_s);
i = 0;
while (version_s && version_s[i] != '\0' && g_ascii_isdigit (version_s[i]))
i++;
/* wrong version length */
if (i != 3) {
GST_WARNING ("version number has the wrong number of digits: %s",
version_s);
g_free (str);
goto error;
}
if (version_s[i] != 0) {
version_s[i] = '\0';
i++;
profile_s = &version_s[i];
profile_s = g_strstrip (profile_s);
profile = gst_glsl_profile_from_string (profile_s);
}
version = gst_glsl_version_from_string (version_s);
g_free (str);
/* check whether the parsed data is valid */
if (!version) {
GST_WARNING ("Could not map the version number to a valid GLSL version:");
goto error;
}
if (!_is_valid_version_profile (version, profile)) {
GST_WARNING ("Invalid version/profile combination specified: %s %s",
gst_glsl_version_to_string (version),
gst_glsl_profile_to_string (profile));
goto error;
}
/* got a profile when none was expected */
if (version <= GST_GLSL_VERSION_140 && profile != GST_GLSL_PROFILE_NONE) {
GST_WARNING
("Found a profile (%s) with a version (%s) that does not support "
"profiles", gst_glsl_version_to_string (version),
gst_glsl_profile_to_string (profile));
goto error;
}
_fixup_version_profile (&version, &profile);
if (profile_ret)
*profile_ret = profile;
if (version_ret)
*version_ret = version;
return TRUE;
error:
{
if (profile_ret)
*profile_ret = GST_GLSL_PROFILE_NONE;
if (version_ret)
*version_ret = GST_GLSL_VERSION_NONE;
return FALSE;
}
}
/* returns the pointer in @str to the #version declaration */
const gchar *
_gst_glsl_shader_string_find_version (const gchar * str)
{
gboolean sl_comment = FALSE;
gboolean ml_comment = FALSE;
gboolean newline = TRUE;
gint i = 0;
_init_debug ();
/* search for #version while allowing for preceding comments/whitespace as
* permitted by the GLSL specification */
while (str && str[i] != '\0' && i < 1024) {
if (str[i] == '\n' || str[i] == '\r') {
newline = TRUE;
sl_comment = FALSE;
i++;
continue;
}
if (g_ascii_isspace (str[i]))
goto next;
if (sl_comment)
goto next;
if (ml_comment) {
if (g_strstr_len (&str[i], 2, "*/")) {
ml_comment = FALSE;
i++;
}
goto next;
}
if (g_strstr_len (&str[i], 2, "//")) {
sl_comment = TRUE;
i++;
goto next;
}
if (g_strstr_len (&str[i], 2, "/*")) {
ml_comment = TRUE;
i++;
goto next;
}
if (str[i] == '#') {
if (newline && _check_valid_version_preprocessor_string (&str[i])) {
GST_DEBUG ("found #version declaration at index %i", i);
return &str[i];
}
break;
}
next:
newline = FALSE;
i++;
}
GST_DEBUG ("no #version declaration found in the first 1K");
return NULL;
}
/**
* gst_glsl_string_get_version_profile:
* @s: string to search for a valid `#version` string
* @version: (out): resulting #GstGLSLVersion
* @profile: (out): resulting #GstGLSLProfile
*
* Note: this function first searches the first 1 kilobytes for a `#version`
* preprocessor directive and then executes gst_glsl_version_profile_from_string().
*
* Returns: TRUE if a valid `#version` string was found, FALSE otherwise
*/
gboolean
gst_glsl_string_get_version_profile (const gchar * s, GstGLSLVersion * version,
GstGLSLProfile * profile)
{
const gchar *version_profile_s;
version_profile_s = _gst_glsl_shader_string_find_version (s);
if (!version_profile_s)
goto error;
if (!gst_glsl_version_profile_from_string (version_profile_s, version,
profile))
goto error;
return TRUE;
error:
{
if (version)
*version = GST_GLSL_VERSION_NONE;
if (profile)
*profile = GST_GLSL_PROFILE_NONE;
return FALSE;
}
}
/**
* gst_gl_version_to_glsl_version:
* @gl_api: the #GstGLAPI
* @maj: the major GL version
* @min: the minor GL version
*
* Returns: The minimum supported #GstGLSLVersion available for @gl_api, @maj and @min
*/
GstGLSLVersion
gst_gl_version_to_glsl_version (GstGLAPI gl_api, gint maj, gint min)
{
g_return_val_if_fail (gl_api != GST_GL_API_NONE, 0);
_init_debug ();
if (gl_api & GST_GL_API_GLES2) {
if (maj == 2 && min == 0)
return 100;
if (maj == 3 && min >= 0 && min <= 2)
return maj * 100 + min * 10;
GST_WARNING ("unknown GLES version");
return 0;
}
/* versions match for >= 3.3 */
if (gl_api & (GST_GL_API_OPENGL3 | GST_GL_API_OPENGL)) {
if (maj > 3 || (maj == 3 && min >= 3))
return maj * 100 + min * 10;
if (maj == 3 && min == 2)
return 150;
if (maj == 3 && min == 1)
return 140;
if (maj == 3 && min == 0)
return 130;
if (maj == 2 && min == 1)
return 120;
if (maj == 2 && min == 0)
return 110;
GST_WARNING ("unknown GL version");
return 0;
}
GST_WARNING ("unknown GL API");
return 0;
}
/**
* gst_gl_context_supports_glsl_profile_version:
* @context: a #GstGLContext
* @version: a #GstGLSLVersion
* @profile: a #GstGLSLProfile
*
* Returns: Whether @context supports the combination of @version with @profile
*/
gboolean
gst_gl_context_supports_glsl_profile_version (GstGLContext * context,
GstGLSLVersion version, GstGLSLProfile profile)
{
g_return_val_if_fail (GST_IS_GL_CONTEXT (context), FALSE);
if (!_is_valid_version_profile (version, profile))
return FALSE;
if (profile != GST_GLSL_PROFILE_NONE) {
if (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 2, 0)) {
if ((profile & GST_GLSL_PROFILE_ES) == 0)
return FALSE;
} else if ((gst_gl_context_get_gl_api (context) & GST_GL_API_OPENGL) != 0) {
if ((profile & GST_GLSL_PROFILE_COMPATIBILITY) == 0)
return FALSE;
} else if ((gst_gl_context_get_gl_api (context) & GST_GL_API_OPENGL3) != 0) {
/* GL_ARB_es2_compatibility is required for GL3 contexts */
if ((profile & (GST_GLSL_PROFILE_CORE | GST_GLSL_PROFILE_ES)) == 0)
return FALSE;
} else {
g_assert_not_reached ();
}
}
if (version != GST_GLSL_VERSION_NONE) {
GstGLAPI gl_api;
gint maj, min, glsl_version;
if (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 3, 1)) {
if (version > GST_GLSL_VERSION_310)
return FALSE;
} else if (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 3,
0)) {
if (version > GST_GLSL_VERSION_300)
return FALSE;
} else if (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 2,
0)) {
if (version > GST_GLSL_VERSION_100)
return FALSE;
}
gl_api = gst_gl_context_get_gl_api (context);
gst_gl_context_get_gl_version (context, &maj, &min);
glsl_version = gst_gl_version_to_glsl_version (gl_api, maj, min);
if (version > glsl_version)
return FALSE;
if (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL3, 1, 0))
/* GL_ARB_es2_compatibility is required for GL3 contexts */
if (version < GST_GLSL_VERSION_150 && version != GST_GLSL_VERSION_100)
return FALSE;
if (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL, 1, 0)
&& version < GST_GLSL_VERSION_110)
return FALSE;
}
return TRUE;
}
gboolean
_gst_glsl_funcs_fill (GstGLSLFuncs * vtable, GstGLContext * context)
{
GstGLFuncs *gl = context->gl_vtable;
if (vtable->initialized)
return TRUE;
if (gl->CreateProgram) {
vtable->CreateProgram = gl->CreateProgram;
vtable->DeleteProgram = gl->DeleteProgram;
vtable->UseProgram = gl->UseProgram;
vtable->CreateShader = gl->CreateShader;
vtable->DeleteShader = gl->DeleteShader;
vtable->AttachShader = gl->AttachShader;
vtable->DetachShader = gl->DetachShader;
vtable->GetAttachedShaders = gl->GetAttachedShaders;
vtable->GetShaderInfoLog = gl->GetShaderInfoLog;
vtable->GetShaderiv = gl->GetShaderiv;
vtable->GetProgramInfoLog = gl->GetProgramInfoLog;
vtable->GetProgramiv = gl->GetProgramiv;
} else if (gl->CreateProgramObject) {
vtable->CreateProgram = gl->CreateProgramObject;
vtable->DeleteProgram = gl->DeleteObject;
vtable->UseProgram = gl->UseProgramObject;
vtable->CreateShader = gl->CreateShaderObject;
vtable->DeleteShader = gl->DeleteObject;
vtable->AttachShader = gl->AttachObject;
vtable->DetachShader = gl->DetachObject;
vtable->GetAttachedShaders = gl->GetAttachedObjects;
vtable->GetShaderInfoLog = gl->GetInfoLog;
vtable->GetShaderiv = gl->GetObjectParameteriv;
vtable->GetProgramInfoLog = gl->GetInfoLog;
vtable->GetProgramiv = gl->GetObjectParameteriv;
} else {
vtable->initialized = FALSE;
return FALSE;
}
vtable->initialized = TRUE;
return TRUE;
}
static gchar *
_mangle_external_image_extension (const gchar * str, GstGLContext * context,
GstGLTextureTarget from, GstGLTextureTarget to, GstGLSLVersion version,
GstGLSLProfile profile)
{
GST_DEBUG ("is oes? %d, profile == ES? %d, version >= 300? %d, "
"have essl3? %d", to == GST_GL_TEXTURE_TARGET_EXTERNAL_OES,
profile == GST_GLSL_PROFILE_ES, version >= GST_GLSL_VERSION_300,
gst_gl_context_check_feature (context,
"GL_OES_EGL_image_external_essl3"));
/* replace GL_OES_EGL_image_external with GL_OES_EGL_image_external_essl3 where supported */
if (to == GST_GL_TEXTURE_TARGET_EXTERNAL_OES && profile == GST_GLSL_PROFILE_ES
&& version >= GST_GLSL_VERSION_300) {
if (gst_gl_context_check_feature (context,
"GL_OES_EGL_image_external_essl3")) {
GRegex *regex = g_regex_new (
/* '#extension ' with optional spacing */
"(#[ \\t]*extension[ \\t]+)"
/* what we're looking to replace */
"GL_OES_EGL_image_external"
/* ':' with optional spacing */
"([ \\t]*:[ \\t]*"
/* some word like require, disable, etc followed by spacing and a newline */
"\\S+[ \\t]*\\R)",
0, 0, NULL);
gchar *tmp = g_regex_replace (regex, str, -1, 0,
"\\1GL_OES_EGL_image_external_essl3\\2", 0, NULL);
g_regex_unref (regex);
return tmp;
} else {
GST_FIXME ("Undefined situation detected. GLES3 supported but "
"GL_OES_EGL_image_external_essl3 not supported. Falling back to the "
"older GL_OES_EGL_image_external extension");
return g_strdup (str);
}
} else {
return g_strdup (str);
}
}
static gchar *
_mangle_texture_access (const gchar * str, GstGLContext * context,
GstGLTextureTarget from, GstGLTextureTarget to, GstGLSLVersion version,
GstGLSLProfile profile)
{
const gchar *from_str = NULL, *to_str = NULL;
gchar *ret, *tmp;
gchar *regex_find;
GRegex *regex;
if (from == GST_GL_TEXTURE_TARGET_2D)
from_str = "texture2D";
if (from == GST_GL_TEXTURE_TARGET_RECTANGLE)
from_str = "texture2DRect";
if (from == GST_GL_TEXTURE_TARGET_EXTERNAL_OES)
from_str = "texture2D";
/* GL3 || gles3 but not when external-oes unless the image_external_essl3 extension is supported */
if (profile == GST_GLSL_PROFILE_CORE || (profile == GST_GLSL_PROFILE_ES
&& version >= GST_GLSL_VERSION_300
&& (to != GST_GL_TEXTURE_TARGET_EXTERNAL_OES
|| gst_gl_context_check_feature (context,
"GL_OES_EGL_image_external_essl3")))) {
to_str = "texture";
} else {
if (to == GST_GL_TEXTURE_TARGET_2D)
to_str = "texture2D";
if (to == GST_GL_TEXTURE_TARGET_RECTANGLE)
to_str = "texture2DRect";
if (to == GST_GL_TEXTURE_TARGET_EXTERNAL_OES)
to_str = "texture2D";
}
/* followed by any amount of whitespace then a bracket */
regex_find = g_strdup_printf ("%s(?=\\s*\\()", from_str);
regex = g_regex_new (regex_find, 0, 0, NULL);
tmp = g_regex_replace_literal (regex, str, -1, 0, to_str, 0, NULL);
g_free (regex_find);
g_regex_unref (regex);
if (tmp) {
ret = tmp;
} else {
GST_FIXME ("Couldn't mangle texture access successfully from %s to %s",
from_str, to_str);
ret = g_strdup (str);
}
return ret;
}
static gchar *
_mangle_sampler_type (const gchar * str, GstGLTextureTarget from,
GstGLTextureTarget to)
{
const gchar *from_str = NULL, *to_str = NULL;
gchar *ret, *tmp;
gchar *regex_find;
GRegex *regex;
if (from == GST_GL_TEXTURE_TARGET_2D)
from_str = "sampler2D";
if (from == GST_GL_TEXTURE_TARGET_RECTANGLE)
from_str = "sampler2DRect";
if (from == GST_GL_TEXTURE_TARGET_EXTERNAL_OES)
from_str = "samplerExternalOES";
if (to == GST_GL_TEXTURE_TARGET_2D)
to_str = "sampler2D";
if (to == GST_GL_TEXTURE_TARGET_RECTANGLE)
to_str = "sampler2DRect";
if (to == GST_GL_TEXTURE_TARGET_EXTERNAL_OES)
to_str = "samplerExternalOES";
/* followed by some whitespace */
regex_find = g_strdup_printf ("%s(?=\\s)", from_str);
regex = g_regex_new (regex_find, 0, 0, NULL);
tmp = g_regex_replace_literal (regex, str, -1, 0, to_str, 0, NULL);
g_free (regex_find);
g_regex_unref (regex);
if (tmp) {
ret = tmp;
} else {
GST_FIXME ("Couldn't mangle sampler type successfully from %s to %s",
from_str, to_str);
ret = g_strdup (str);
}
return ret;
}
static gchar *
_mangle_varying_attribute (const gchar * str, guint shader_type,
GstGLSLVersion version, GstGLSLProfile profile)
{
if (shader_type == GL_VERTEX_SHADER) {
if (profile == GST_GLSL_PROFILE_CORE || (profile == GST_GLSL_PROFILE_ES
&& version >= GST_GLSL_VERSION_300)) {
gchar *tmp, *tmp2;
GRegex *regex;
/* followed by some whitespace */
regex = g_regex_new ("varying(?=\\s)", 0, 0, NULL);
tmp = g_regex_replace_literal (regex, str, -1, 0, "out", 0, NULL);
g_regex_unref (regex);
/* followed by some whitespace */
regex = g_regex_new ("attribute(?=\\s)", 0, 0, NULL);
tmp2 = g_regex_replace_literal (regex, tmp, -1, 0, "in", 0, NULL);
g_regex_unref (regex);
g_free (tmp);
return tmp2;
}
} else if (shader_type == GL_FRAGMENT_SHADER) {
if (profile == GST_GLSL_PROFILE_CORE || (profile == GST_GLSL_PROFILE_ES
&& version >= GST_GLSL_VERSION_300)) {
gchar *tmp;
GRegex *regex;
/* followed by some whitespace */
regex = g_regex_new ("varying(?=\\s)", 0, 0, NULL);
tmp = g_regex_replace_literal (regex, str, -1, 0, "in", 0, NULL);
g_regex_unref (regex);
return tmp;
}
}
return g_strdup (str);
}
static gchar *
_mangle_frag_color_data (const gchar * str)
{
GRegex *regex;
gchar *ret, *tmp;
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);
tmp = ret;
/* search and replace 'gl_FragData[NUM]' into fragColor_NUM */
regex = g_regex_new ("gl_FragData\\[(\\d+)\\]", 0, 0, NULL);
ret = g_regex_replace (regex, tmp, -1, 0, "fragColor_\\1", 0, NULL);
g_regex_unref (regex);
g_free (tmp);
return ret;
}
static void
_mangle_version_profile_from_gl_api (GstGLContext * context,
GstGLTextureTarget from, GstGLTextureTarget to, GstGLSLVersion * version,
GstGLSLProfile * profile)
{
GstGLAPI gl_api;
gint gl_major, gl_minor;
gl_api = gst_gl_context_get_gl_api (context);
gst_gl_context_get_gl_version (context, &gl_major, &gl_minor);
*version = GST_GLSL_VERSION_NONE;
*profile = GST_GLSL_PROFILE_NONE;
if (gl_api & GST_GL_API_OPENGL3) {
if (gl_major > 3 || gl_minor >= 3) {
*version = GST_GLSL_VERSION_330;
*profile = GST_GLSL_PROFILE_CORE;
} else {
*version = GST_GLSL_VERSION_150;
*profile = GST_GLSL_PROFILE_NONE;
}
} else if (gl_api & GST_GL_API_GLES2) {
/* We don't know which texture function to use if we have GLES3 and
* don't have the essl3 extension */
if (gl_major >= 3 && (to != GST_GL_TEXTURE_TARGET_EXTERNAL_OES
|| gst_gl_context_check_feature (context,
"GL_OES_EGL_image_external_essl3"))) {
*version = GST_GLSL_VERSION_300;
*profile = GST_GLSL_PROFILE_ES;
} else if (gl_major >= 2) {
*version = GST_GLSL_VERSION_100;
*profile = GST_GLSL_PROFILE_ES;
}
} else if (gl_api & GST_GL_API_OPENGL) {
*version = GST_GLSL_VERSION_110;
*profile = GST_GLSL_PROFILE_COMPATIBILITY;
}
}
gchar *
_gst_glsl_mangle_shader (const gchar * str, guint shader_type,
GstGLTextureTarget from, GstGLTextureTarget to, GstGLContext * context,
GstGLSLVersion * version, GstGLSLProfile * profile)
{
gchar *tmp, *tmp2;
_init_debug ();
g_return_val_if_fail (GST_IS_GL_CONTEXT (context), NULL);
_mangle_version_profile_from_gl_api (context, from, to, version, profile);
tmp2 =
_mangle_external_image_extension (str, context, from, to, *version,
*profile);
tmp = _mangle_texture_access (tmp2, context, from, to, *version, *profile);
g_free (tmp2);
tmp2 = _mangle_sampler_type (tmp, from, to);
g_free (tmp);
tmp = _mangle_varying_attribute (tmp2, shader_type, *version, *profile);
g_free (tmp2);
if (shader_type == GL_FRAGMENT_SHADER) {
if ((*profile == GST_GLSL_PROFILE_ES && *version >= GST_GLSL_VERSION_300)
|| (*profile == GST_GLSL_PROFILE_CORE
&& *version >= GST_GLSL_VERSION_150)) {
tmp2 = _mangle_frag_color_data (tmp);
g_free (tmp);
tmp = tmp2;
}
}
return tmp;
}
/**
* gst_gl_context_supports_precision:
* @context: a #GstGLContext
* @version: a #GstGLSLVersion
* @profile: a #GstGLSLProfile
*
* Returns: whether @context supports the 'precision' specifier in GLSL shaders
*
* Since: 1.16
*/
gboolean
gst_gl_context_supports_precision (GstGLContext * context,
GstGLSLVersion version, GstGLSLProfile profile)
{
gboolean es2 = FALSE;
g_return_val_if_fail (GST_IS_GL_CONTEXT (context), FALSE);
if ((profile & GST_GLSL_PROFILE_ES) == 0)
return FALSE;
es2 = gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 2, 0)
|| gst_gl_context_check_feature (context, "GL_ARB_ES2_compatibility");
return es2 && context->gl_vtable->GetShaderPrecisionFormat;
}
/**
* gst_gl_context_supports_precision_highp:
* @context: a #GstGLContext
* @version: a #GstGLSLVersion
* @profile: a #GstGLSLProfile
*
* Returns: whether @context supports the 'precision highp' specifier in GLSL shaders
*
* Since: 1.16
*/
gboolean
gst_gl_context_supports_precision_highp (GstGLContext * context,
GstGLSLVersion version, GstGLSLProfile profile)
{
gint v_range[2] = { 0, }
, v_precision = 0;
gint f_range[2] = { 0, }
, f_precision = 0;
g_return_val_if_fail (GST_IS_GL_CONTEXT (context), FALSE);
if (!gst_gl_context_supports_precision (context, version, profile))
return FALSE;
context->gl_vtable->GetShaderPrecisionFormat (GL_VERTEX_SHADER, GL_HIGH_FLOAT,
v_range, &v_precision);
context->gl_vtable->GetShaderPrecisionFormat (GL_FRAGMENT_SHADER,
GL_HIGH_FLOAT, f_range, &f_precision);
return v_range[0] != 0 && v_range[1] != 0 && v_precision != 0 &&
f_range[0] != 0 && f_range[1] != 0 && f_precision != 0;
}