Add GLEW 1.10.0 emulation

Includes library_glew.js that stubs the init functions, but also provides the
other functions.

GL/glew.h is now changed to work with GLEW_EXT_foo_bar constants,
some missing constants that are in GLEW 1.10.0 are also provided.

Otherwise it still uses SDL_opengl.h to provide function definitions and
other constants.

Linaro's GLEW (glew-oes) is also supported to some degree to make it
easier to get ES1 and ES2 software using it running.

What it lacks:
- Some constants and function declarations that are in GLEW 1.10.0
might be missing.
- The real glew-es fork also includes normal GL constants and
function pointers, this does not.

Tests ran:
- tests/runner.py browser

Real world example using this code (and upcomming glfw3 port) can be found here:
http://cloudef.eu/glhck
http://cloudef.eu/glhck/qb.html

2 files changed, 56 insertions, 1 deletions

diff --git a/tests/glew.c b/tests/glew.c
new file mode 100644
index 00000000..3bf93fd9
--- /dev/null
+++ b/tests/glew.c
@@ -0,0 +1,51 @@
+#include <GL/glew.h>
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+/* for context creation */
+#include <SDL/SDL.h>
+
+int main()
+{
+    assert(SDL_Init(SDL_INIT_VIDEO) == 0);
+    assert(SDL_SetVideoMode(640, 480, 16, SDL_OPENGL) != NULL);
+
+    assert(glewInit() == GLEW_OK);
+    assert(glewGetString(0) == NULL);
+    assert(!strcmp((const char*)glewGetString(1), "1.10.0"));
+    assert(!strcmp((const char*)glewGetString(2), "1"));
+    assert(!strcmp((const char*)glewGetString(3), "10"));
+    assert(!strcmp((const char*)glewGetString(4), "0"));
+
+    for (int i = 0; i < 8; ++i) {
+        assert(glewGetErrorString(i) != NULL);
+    }
+
+    assert(glewGetExtension("EXT_unexistant") == 0);
+    assert(glewIsSupported("EXT_unexistant EXT_foobar") == 0);
+
+    /* we can't be sure about which extension exists, so lets do test on
+     * some of the common ones */
+    if (GLEW_EXT_texture_filter_anisotropic) {
+        assert(glewGetExtension("EXT_texture_filter_anisotropic") == 1);
+        assert(glewGetExtension("GL_EXT_texture_filter_anisotropic") == 1);
+    }
+
+    if (GLEW_EXT_framebuffer_object) {
+        assert(glewGetExtension("EXT_framebuffer_object") == 1);
+        assert(glewGetExtension("GL_EXT_framebuffer_object") == 1);
+    }
+
+    if (GLEW_EXT_texture_filter_anisotropic &&
+        GLEW_EXT_framebuffer_object) {
+        assert(glewIsSupported("EXT_texture_filter_anisotropic EXT_framebuffer_object") == 1);
+        assert(glewIsSupported("GL_EXT_texture_filter_anisotropic GL_EXT_framebuffer_object") == 1);
+    }
+
+#ifdef REPORT_RESULT
+    int result = 1;
+    REPORT_RESULT();
+#endif
+    return 0;
+}
diff --git a/tests/test_browser.py b/tests/test_browser.py
index c2eaabb6..23022604 100644
--- a/tests/test_browser.py
+++ b/tests/test_browser.py
@@ -1746,4 +1746,8 @@ keydown(100);keyup(100); // trigger the end
     # Now run test in browser
     self.btest(path_from_root('tests', 'uuid', 'test.c'), '1')
 
-
+  def test_glew(self):
+    self.btest(path_from_root('tests', 'glew.c'), expected='1')
+    self.btest(path_from_root('tests', 'glew.c'), args=['-s', 'LEGACY_GL_EMULATION=1'], expected='1')
+    self.btest(path_from_root('tests', 'glew.c'), args=['-DGLEW_MX'], expected='1')
+    self.btest(path_from_root('tests', 'glew.c'), args=['-s', 'LEGACY_GL_EMULATION=1', '-DGLEW_MX'], expected='1')