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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
/*
* Manipulation of GL extensions.
*
* So far we insert GREMEDY extensions, but in the future we could also clamp
* the GL extensions to core GL versions here.
*/
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <string>
#include <map>
#include "glproc.hpp"
#include "gltrace.hpp"
namespace gltrace {
typedef std::map<std::string, const char *> ExtensionsMap;
// Cache of the translated extensions strings
static ExtensionsMap extensionsMap;
// Additional extensions to be advertised
static const char *extra_extensions[] = {
"GL_GREMEDY_string_marker",
"GL_GREMEDY_frame_terminator",
};
#define NUM_EXTRA_EXTENSIONS (sizeof(extra_extensions)/sizeof(extra_extensions[0]))
/**
* Translate the GL extensions string, adding new extensions.
*/
static const char *
overrideExtensionsString(const char *extensions)
{
size_t i;
ExtensionsMap::const_iterator it = extensionsMap.find(extensions);
if (it != extensionsMap.end()) {
return it->second;
}
size_t extensions_len = strlen(extensions);
size_t extra_extensions_len = 0;
for (i = 0; i < NUM_EXTRA_EXTENSIONS; ++i) {
const char * extra_extension = extra_extensions[i];
size_t extra_extension_len = strlen(extra_extension);
extra_extensions_len += extra_extension_len + 1;
}
// We use malloc memory instead of a std::string because we need to ensure
// that extensions strings will not move in memory as the extensionsMap is
// updated.
size_t new_extensions_len = extensions_len + 1 + extra_extensions_len + 1;
char *new_extensions = (char *)malloc(new_extensions_len);
if (!new_extensions) {
return extensions;
}
if (extensions_len) {
memcpy(new_extensions, extensions, extensions_len);
// Add space separator if necessary
if (new_extensions[extensions_len - 1] != ' ') {
new_extensions[extensions_len++] = ' ';
}
}
for (i = 0; i < NUM_EXTRA_EXTENSIONS; ++i) {
const char * extra_extension = extra_extensions[i];
size_t extra_extension_len = strlen(extra_extension);
memcpy(new_extensions + extensions_len, extra_extension, extra_extension_len);
extensions_len += extra_extension_len;
new_extensions[extensions_len++] = ' ';
}
new_extensions[extensions_len++] = '\0';
assert(extensions_len <= new_extensions_len);
extensionsMap[extensions] = new_extensions;
return new_extensions;
}
const GLubyte *
__glGetString_override(GLenum name)
{
const GLubyte *result = __glGetString(name);
if (result) {
switch (name) {
case GL_EXTENSIONS:
result = (const GLubyte *)overrideExtensionsString((const char *)result);
break;
default:
break;
}
}
return result;
}
void
__glGetIntegerv_override(GLenum pname, GLint *params)
{
__glGetIntegerv(pname, params);
if (params) {
switch (pname) {
case GL_NUM_EXTENSIONS:
*params += NUM_EXTRA_EXTENSIONS;
break;
default:
break;
}
}
}
const GLubyte *
__glGetStringi_override(GLenum name, GLuint index)
{
switch (name) {
case GL_EXTENSIONS:
{
GLint num_extensions = 0;
__glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
if ((GLuint)num_extensions <= index && index < (GLuint)num_extensions + NUM_EXTRA_EXTENSIONS) {
return (const GLubyte *)extra_extensions[index - (GLuint)num_extensions];
}
}
break;
default:
break;
}
return __glGetStringi(name, index);
}
} /* namespace gltrace */
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