1 files changed, 85 insertions, 0 deletions
diff --git a/common/gl_utils.h b/common/gl_utils.h
new file mode 100644
index 00000000..41266775
--- /dev/null
+++ b/common/gl_utils.h
@@ -0,0 +1,85 @@
+/*
+   Copyright (C) 2009 Red Hat, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#ifndef GL_UTILS_H
+#define GL_UTILS_H
+
+#ifdef RED_DEBUG
+#define GLC_ERROR_TEST_FLUSH {                                        \
+    GLenum gl_err;  glFlush();                                        \
+    if ((gl_err = glGetError()) != GL_NO_ERROR) {                     \
+        printf("%s[%d]: opengl error: %s\n",  __FUNCTION__, __LINE__, \
+        gluErrorString(gl_err));                                      \
+        abort();                                                      \
+    }                                                                 \
+}
+
+#define GLC_ERROR_TEST_FINISH {                                       \
+    GLenum gl_err;  glFinish();                                       \
+    if ((gl_err = glGetError()) != GL_NO_ERROR) {                     \
+        printf("%s[%d]: opengl error: %s\n",  __FUNCTION__, __LINE__, \
+        gluErrorString(gl_err));                                      \
+        abort();                                                      \
+    }                                                                 \
+}
+#else
+#define GLC_ERROR_TEST_FLUSH ;
+
+#define GLC_ERROR_TEST_FINISH ;
+#endif
+
+#ifdef WIN32
+static inline int find_msb(uint32_t val)
+{
+    uint32_t r;
+    __asm {
+        bsr eax, val
+        jnz found
+        mov eax, -1
+
+found:
+        mov r, eax
+    }
+    return r + 1;
+}
+
+#else
+static inline int find_msb(unsigned int val)
+{
+    int ret;
+
+    asm ("bsrl %1,%0\n\t"
+         "jnz 1f\n\t"
+         "movl $-1,%0\n"
+         "1:"
+         : "=r"(ret) : "r"(val));
+    return ret + 1;
+}
+
+#endif
+
+static inline int gl_get_to_power_two(unsigned int val)
+{
+    if ((val & (val - 1)) == 0) {
+        return val;
+    }
+    return 1 << find_msb(val);
+}
+
+#endif