**************************************************************************/
+/*
+ * 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"
// Additional extensions to be advertised
-const char extra_extensions[] =
- "GL_GREMEDY_string_marker "
- "GL_GREMEDY_frame_terminator "
-;
+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.
*/
-const char *
-translateExtensionsString(const char *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);
- char *new_extensions = (char *)malloc(extensions_len + 1 + sizeof extra_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;
}
}
}
- memcpy(new_extensions + extensions_len, extra_extensions, sizeof extra_extensions);
+ 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;
}
+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 */