gstreamer/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglsl.c

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;
}