diff --git a/gb.opengl/src/GL.c b/gb.opengl/src/GL.c
index b133f1692..0d32145e3 100644
--- a/gb.opengl/src/GL.c
+++ b/gb.opengl/src/GL.c
@@ -650,57 +650,57 @@ GB_DESC Cgl[] =
 	/* Scissor box */
 	GB_CONSTANT("GL_SCISSOR_BOX", "i", GL_SCISSOR_BOX),
 	GB_CONSTANT("GL_SCISSOR_TEST", "i", GL_SCISSOR_TEST),
-#if 0
-/* Pixel Mode / Transfer */
-#define GL_MAP_COLOR				0x0D10
-#define GL_MAP_STENCIL				0x0D11
-#define GL_INDEX_SHIFT				0x0D12
-#define GL_INDEX_OFFSET				0x0D13
-#define GL_RED_SCALE				0x0D14
-#define GL_RED_BIAS				0x0D15
-#define GL_GREEN_SCALE				0x0D18
-#define GL_GREEN_BIAS				0x0D19
-#define GL_BLUE_SCALE				0x0D1A
-#define GL_BLUE_BIAS				0x0D1B
-#define GL_ALPHA_SCALE				0x0D1C
-#define GL_ALPHA_BIAS				0x0D1D
-#define GL_DEPTH_SCALE				0x0D1E
-#define GL_DEPTH_BIAS				0x0D1F
-#define GL_PIXEL_MAP_S_TO_S_SIZE		0x0CB1
-#define GL_PIXEL_MAP_I_TO_I_SIZE		0x0CB0
-#define GL_PIXEL_MAP_I_TO_R_SIZE		0x0CB2
-#define GL_PIXEL_MAP_I_TO_G_SIZE		0x0CB3
-#define GL_PIXEL_MAP_I_TO_B_SIZE		0x0CB4
-#define GL_PIXEL_MAP_I_TO_A_SIZE		0x0CB5
-#define GL_PIXEL_MAP_R_TO_R_SIZE		0x0CB6
-#define GL_PIXEL_MAP_G_TO_G_SIZE		0x0CB7
-#define GL_PIXEL_MAP_B_TO_B_SIZE		0x0CB8
-#define GL_PIXEL_MAP_A_TO_A_SIZE		0x0CB9
-#define GL_PIXEL_MAP_S_TO_S			0x0C71
-#define GL_PIXEL_MAP_I_TO_I			0x0C70
-#define GL_PIXEL_MAP_I_TO_R			0x0C72
-#define GL_PIXEL_MAP_I_TO_G			0x0C73
-#define GL_PIXEL_MAP_I_TO_B			0x0C74
-#define GL_PIXEL_MAP_I_TO_A			0x0C75
-#define GL_PIXEL_MAP_R_TO_R			0x0C76
-#define GL_PIXEL_MAP_G_TO_G			0x0C77
-#define GL_PIXEL_MAP_B_TO_B			0x0C78
-#define GL_PIXEL_MAP_A_TO_A			0x0C79
-#define GL_PACK_ALIGNMENT			0x0D05
-#define GL_PACK_LSB_FIRST			0x0D01
-#define GL_PACK_ROW_LENGTH			0x0D02
-#define GL_PACK_SKIP_PIXELS			0x0D04
-#define GL_PACK_SKIP_ROWS			0x0D03
-#define GL_PACK_SWAP_BYTES			0x0D00
-#define GL_UNPACK_ALIGNMENT			0x0CF5
-#define GL_UNPACK_LSB_FIRST			0x0CF1
-#define GL_UNPACK_ROW_LENGTH			0x0CF2
-#define GL_UNPACK_SKIP_PIXELS			0x0CF4
-#define GL_UNPACK_SKIP_ROWS			0x0CF3
-#define GL_UNPACK_SWAP_BYTES			0x0CF0
-#define GL_ZOOM_X				0x0D16
-#define GL_ZOOM_Y				0x0D17
-#endif
+
+	/* Pixel Mode / Transfer */
+	GB_CONSTANT("GL_MAP_COLOR", "i", GL_MAP_COLOR),
+	GB_CONSTANT("GL_MAP_STENCIL", "i", GL_MAP_STENCIL),
+	GB_CONSTANT("GL_INDEX_SHIFT", "i", GL_INDEX_SHIFT),
+	GB_CONSTANT("GL_INDEX_OFFSET", "i", GL_INDEX_OFFSET),
+	GB_CONSTANT("GL_RED_SCALE", "i", GL_RED_SCALE),
+	GB_CONSTANT("GL_RED_BIAS", "i", GL_RED_BIAS),
+	GB_CONSTANT("GL_GREEN_SCALE", "i", GL_GREEN_SCALE),
+	GB_CONSTANT("GL_GREEN_BIAS", "i", GL_GREEN_BIAS),
+	GB_CONSTANT("GL_BLUE_SCALE", "i", GL_BLUE_SCALE),
+	GB_CONSTANT("GL_BLUE_BIAS", "i", GL_BLUE_BIAS),
+	GB_CONSTANT("GL_ALPHA_SCALE", "i", GL_ALPHA_SCALE),
+	GB_CONSTANT("GL_ALPHA_BIAS", "i", GL_ALPHA_BIAS),
+	GB_CONSTANT("GL_DEPTH_SCALE", "i", GL_DEPTH_SCALE),
+	GB_CONSTANT("GL_DEPTH_BIAS", "i", GL_DEPTH_BIAS),
+	GB_CONSTANT("GL_PIXEL_MAP_S_TO_S_SIZE", "i", GL_PIXEL_MAP_S_TO_S_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_I_SIZE", "i", GL_PIXEL_MAP_I_TO_I_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_R_SIZE", "i", GL_PIXEL_MAP_I_TO_R_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_G_SIZE", "i", GL_PIXEL_MAP_I_TO_G_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_B_SIZE", "i", GL_PIXEL_MAP_I_TO_B_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_A_SIZE", "i", GL_PIXEL_MAP_I_TO_A_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_R_TO_R_SIZE", "i", GL_PIXEL_MAP_R_TO_R_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_G_TO_G_SIZE", "i", GL_PIXEL_MAP_G_TO_G_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_B_TO_B_SIZE", "i", GL_PIXEL_MAP_B_TO_B_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_A_TO_A_SIZE", "i", GL_PIXEL_MAP_A_TO_A_SIZE),
+	GB_CONSTANT("GL_PIXEL_MAP_S_TO_S", "i", GL_PIXEL_MAP_S_TO_S),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_I", "i", GL_PIXEL_MAP_I_TO_I),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_R", "i", GL_PIXEL_MAP_I_TO_R),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_G", "i", GL_PIXEL_MAP_I_TO_G),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_B", "i", GL_PIXEL_MAP_I_TO_B),
+	GB_CONSTANT("GL_PIXEL_MAP_I_TO_A", "i", GL_PIXEL_MAP_I_TO_A),
+	GB_CONSTANT("GL_PIXEL_MAP_R_TO_R", "i", GL_PIXEL_MAP_R_TO_R),
+	GB_CONSTANT("GL_PIXEL_MAP_G_TO_G", "i", GL_PIXEL_MAP_G_TO_G),
+	GB_CONSTANT("GL_PIXEL_MAP_B_TO_B", "i", GL_PIXEL_MAP_B_TO_B),
+	GB_CONSTANT("GL_PIXEL_MAP_A_TO_A", "i", GL_PIXEL_MAP_A_TO_A),
+	GB_CONSTANT("GL_PACK_ALIGNMENT", "i", GL_PACK_ALIGNMENT),
+	GB_CONSTANT("GL_PACK_LSB_FIRST", "i", GL_PACK_LSB_FIRST),
+	GB_CONSTANT("GL_PACK_ROW_LENGTH", "i", GL_PACK_ROW_LENGTH),
+	GB_CONSTANT("GL_PACK_SKIP_PIXELS", "i", GL_PACK_SKIP_PIXELS),
+	GB_CONSTANT("GL_PACK_SKIP_ROWS", "i", GL_PACK_SKIP_ROWS),
+	GB_CONSTANT("GL_PACK_SWAP_BYTES", "i", GL_PACK_SWAP_BYTES),
+	GB_CONSTANT("GL_UNPACK_ALIGNMENT", "i", GL_UNPACK_ALIGNMENT),
+	GB_CONSTANT("GL_UNPACK_LSB_FIRST", "i", GL_UNPACK_LSB_FIRST),
+	GB_CONSTANT("GL_UNPACK_ROW_LENGTH", "i", GL_UNPACK_ROW_LENGTH),
+	GB_CONSTANT("GL_UNPACK_SKIP_PIXELS", "i", GL_UNPACK_SKIP_PIXELS),
+	GB_CONSTANT("GL_UNPACK_SKIP_ROWS", "i", GL_UNPACK_SKIP_ROWS),
+	GB_CONSTANT("GL_UNPACK_SWAP_BYTES", "i", GL_UNPACK_SWAP_BYTES),
+	GB_CONSTANT("GL_ZOOM_X", "i", GL_ZOOM_X),
+	GB_CONSTANT("GL_ZOOM_Y", "i", GL_ZOOM_Y),
+
 	/* Texture mapping */
 	GB_CONSTANT("GL_TEXTURE_ENV", "i", GL_TEXTURE_ENV),
 	GB_CONSTANT("GL_TEXTURE_ENV_MODE", "i", GL_TEXTURE_ENV_MODE),