diff --git a/src/gl2.rs b/src/gl2.rs
index 104e5db..4a7a442 100644
--- a/src/gl2.rs
+++ b/src/gl2.rs
@@ -35,292 +35,292 @@ extern { }
 // Constants
 
 /* BeginMode */
-pub static POINTS:         c_uint = 0x0000 as c_uint;
-pub static LINES:          c_uint = 0x0001 as c_uint;
-pub static LINE_LOOP:      c_uint = 0x0002 as c_uint;
-pub static LINE_STRIP:     c_uint = 0x0003 as c_uint;
-pub static TRIANGLES:      c_uint = 0x0004 as c_uint;
-pub static TRIANGLE_STRIP: c_uint = 0x0005 as c_uint;
-pub static TRIANGLE_FAN:   c_uint = 0x0006 as c_uint;
-
-pub static DEPTH_BUFFER_BIT:   c_uint = 0x00000100 as c_uint;
-pub static STENCIL_BUFFER_BIT: c_uint = 0x00000400 as c_uint;
-pub static COLOR_BUFFER_BIT:   c_uint = 0x00004000 as c_uint;
+pub const POINTS:         c_uint = 0x0000 as c_uint;
+pub const LINES:          c_uint = 0x0001 as c_uint;
+pub const LINE_LOOP:      c_uint = 0x0002 as c_uint;
+pub const LINE_STRIP:     c_uint = 0x0003 as c_uint;
+pub const TRIANGLES:      c_uint = 0x0004 as c_uint;
+pub const TRIANGLE_STRIP: c_uint = 0x0005 as c_uint;
+pub const TRIANGLE_FAN:   c_uint = 0x0006 as c_uint;
+
+pub const DEPTH_BUFFER_BIT:   c_uint = 0x00000100 as c_uint;
+pub const STENCIL_BUFFER_BIT: c_uint = 0x00000400 as c_uint;
+pub const COLOR_BUFFER_BIT:   c_uint = 0x00004000 as c_uint;
 
 /* BlendingFactorDest */
-pub static ZERO:                     c_uint = 0      as c_uint;
-pub static ONE:                      c_uint = 1      as c_uint;
-pub static SRC_COLOR:                c_uint = 0x0300 as c_uint;
-pub static ONE_MINUS_SRC_COLOR:      c_uint = 0x0301 as c_uint;
-pub static SRC_ALPHA:                c_uint = 0x0302 as c_uint;
-pub static ONE_MINUS_SRC_ALPHA:      c_uint = 0x0303 as c_uint;
-pub static DST_ALPHA:                c_uint = 0x0304 as c_uint;
-pub static ONE_MINUS_DST_ALPHA:      c_uint = 0x0305 as c_uint;
+pub const ZERO:                     c_uint = 0      as c_uint;
+pub const ONE:                      c_uint = 1      as c_uint;
+pub const SRC_COLOR:                c_uint = 0x0300 as c_uint;
+pub const ONE_MINUS_SRC_COLOR:      c_uint = 0x0301 as c_uint;
+pub const SRC_ALPHA:                c_uint = 0x0302 as c_uint;
+pub const ONE_MINUS_SRC_ALPHA:      c_uint = 0x0303 as c_uint;
+pub const DST_ALPHA:                c_uint = 0x0304 as c_uint;
+pub const ONE_MINUS_DST_ALPHA:      c_uint = 0x0305 as c_uint;
 
 /* BlendingFactorSrc */
-pub static DST_COLOR:                c_uint = 0x0306 as c_uint;
-pub static ONE_MINUS_DST_COLOR:      c_uint = 0x0307 as c_uint;
-pub static SRC_ALPHA_SATURATE:       c_uint = 0x0308 as c_uint;
+pub const DST_COLOR:                c_uint = 0x0306 as c_uint;
+pub const ONE_MINUS_DST_COLOR:      c_uint = 0x0307 as c_uint;
+pub const SRC_ALPHA_SATURATE:       c_uint = 0x0308 as c_uint;
 
 /* Boolean */
-pub static TRUE:                     c_uchar = 1 as c_uchar;
-pub static FALSE:                    c_uchar = 0 as c_uchar;
+pub const TRUE:                     c_uchar = 1 as c_uchar;
+pub const FALSE:                    c_uchar = 0 as c_uchar;
 
 /* BlendEquationSeparate */
-pub static FUNC_ADD:                 c_uint = 0x8006 as c_uint;
-pub static BLEND_EQUATION:           c_uint = 0x8009 as c_uint;
-pub static BLEND_EQUATION_RGB:       c_uint = 0x8009 as c_uint;
-pub static BLEND_EQUATION_ALPHA:     c_uint = 0x883D as c_uint;
+pub const FUNC_ADD:                 c_uint = 0x8006 as c_uint;
+pub const BLEND_EQUATION:           c_uint = 0x8009 as c_uint;
+pub const BLEND_EQUATION_RGB:       c_uint = 0x8009 as c_uint;
+pub const BLEND_EQUATION_ALPHA:     c_uint = 0x883D as c_uint;
 
 /* BlendSubtract */
-pub static FUNC_SUBTRACT:            c_uint = 0x800A as c_uint;
-pub static FUNC_REVERSE_SUBTRACT:    c_uint = 0x800B as c_uint;
+pub const FUNC_SUBTRACT:            c_uint = 0x800A as c_uint;
+pub const FUNC_REVERSE_SUBTRACT:    c_uint = 0x800B as c_uint;
 
 /* Separate Blend Functions */
-pub static BLEND_DST_RGB:            c_uint = 0x80C8 as c_uint;
-pub static BLEND_SRC_RGB:            c_uint = 0x80C9 as c_uint;
-pub static BLEND_DST_ALPHA:          c_uint = 0x80CA as c_uint;
-pub static BLEND_SRC_ALPHA:          c_uint = 0x80CB as c_uint;
-pub static CONSTANT_COLOR:           c_uint = 0x8001 as c_uint;
-pub static ONE_MINUS_CONSTANT_COLOR: c_uint = 0x8002 as c_uint;
-pub static CONSTANT_ALPHA:           c_uint = 0x8003 as c_uint;
-pub static ONE_MINUS_CONSTANT_ALPHA: c_uint = 0x8004 as c_uint;
-pub static BLEND_COLOR:              c_uint = 0x8005 as c_uint;
+pub const BLEND_DST_RGB:            c_uint = 0x80C8 as c_uint;
+pub const BLEND_SRC_RGB:            c_uint = 0x80C9 as c_uint;
+pub const BLEND_DST_ALPHA:          c_uint = 0x80CA as c_uint;
+pub const BLEND_SRC_ALPHA:          c_uint = 0x80CB as c_uint;
+pub const CONSTANT_COLOR:           c_uint = 0x8001 as c_uint;
+pub const ONE_MINUS_CONSTANT_COLOR: c_uint = 0x8002 as c_uint;
+pub const CONSTANT_ALPHA:           c_uint = 0x8003 as c_uint;
+pub const ONE_MINUS_CONSTANT_ALPHA: c_uint = 0x8004 as c_uint;
+pub const BLEND_COLOR:              c_uint = 0x8005 as c_uint;
 
 /* Errors. */
-pub static NO_ERROR: c_uint = 0 as c_uint;
-pub static INVALID_ENUM: c_uint = 0x0500 as c_uint;
-pub static INVALID_VALUE: c_uint = 0x0501 as c_uint;
-pub static INVALID_OPERATION: c_uint = 0x0502 as c_uint;
-pub static STACK_OVERFLOW: c_uint = 0x0503 as c_uint;
-pub static STACK_UNDERFLOW: c_uint = 0x0504 as c_uint;
-pub static OUT_OF_MEMORY: c_uint = 0x0505 as c_uint;
-pub static INVALID_FRAMEBUFFER_OPERATION: c_uint = 0x0506 as c_uint;
+pub const NO_ERROR: c_uint = 0 as c_uint;
+pub const INVALID_ENUM: c_uint = 0x0500 as c_uint;
+pub const INVALID_VALUE: c_uint = 0x0501 as c_uint;
+pub const INVALID_OPERATION: c_uint = 0x0502 as c_uint;
+pub const STACK_OVERFLOW: c_uint = 0x0503 as c_uint;
+pub const STACK_UNDERFLOW: c_uint = 0x0504 as c_uint;
+pub const OUT_OF_MEMORY: c_uint = 0x0505 as c_uint;
+pub const INVALID_FRAMEBUFFER_OPERATION: c_uint = 0x0506 as c_uint;
 
 /* DataType */
-pub static BYTE:           c_uint = 0x1400 as c_uint;
-pub static UNSIGNED_BYTE:  c_uint = 0x1401 as c_uint;
-pub static SHORT:          c_uint = 0x1402 as c_uint;
-pub static UNSIGNED_SHORT: c_uint = 0x1403 as c_uint;
-pub static INT:            c_uint = 0x1404 as c_uint;
-pub static UNSIGNED_INT:   c_uint = 0x1405 as c_uint;
-pub static FLOAT:          c_uint = 0x1406 as c_uint;
-pub static FIXED:          c_uint = 0x140C as c_uint;
+pub const BYTE:           c_uint = 0x1400 as c_uint;
+pub const UNSIGNED_BYTE:  c_uint = 0x1401 as c_uint;
+pub const SHORT:          c_uint = 0x1402 as c_uint;
+pub const UNSIGNED_SHORT: c_uint = 0x1403 as c_uint;
+pub const INT:            c_uint = 0x1404 as c_uint;
+pub const UNSIGNED_INT:   c_uint = 0x1405 as c_uint;
+pub const FLOAT:          c_uint = 0x1406 as c_uint;
+pub const FIXED:          c_uint = 0x140C as c_uint;
 
 /* EnableCap */
-pub static TEXTURE_2D:               c_uint = 0x0DE1 as c_uint;
-pub static CULL_FACE:                c_uint = 0x0B44 as c_uint;
-pub static BLEND:                    c_uint = 0x0BE2 as c_uint;
-pub static DITHER:                   c_uint = 0x0BD0 as c_uint;
-pub static STENCIL_TEST:             c_uint = 0x0B90 as c_uint;
-pub static DEPTH_TEST:               c_uint = 0x0B71 as c_uint;
-pub static SCISSOR_TEST:             c_uint = 0x0C11 as c_uint;
-pub static POLYGON_OFFSET_FILL:      c_uint = 0x8037 as c_uint;
-pub static SAMPLE_ALPHA_TO_COVERAGE: c_uint = 0x809E as c_uint;
-pub static SAMPLE_COVERAGE:          c_uint = 0x80A0 as c_uint;
+pub const TEXTURE_2D:               c_uint = 0x0DE1 as c_uint;
+pub const CULL_FACE:                c_uint = 0x0B44 as c_uint;
+pub const BLEND:                    c_uint = 0x0BE2 as c_uint;
+pub const DITHER:                   c_uint = 0x0BD0 as c_uint;
+pub const STENCIL_TEST:             c_uint = 0x0B90 as c_uint;
+pub const DEPTH_TEST:               c_uint = 0x0B71 as c_uint;
+pub const SCISSOR_TEST:             c_uint = 0x0C11 as c_uint;
+pub const POLYGON_OFFSET_FILL:      c_uint = 0x8037 as c_uint;
+pub const SAMPLE_ALPHA_TO_COVERAGE: c_uint = 0x809E as c_uint;
+pub const SAMPLE_COVERAGE:          c_uint = 0x80A0 as c_uint;
 
 /* Polygons */
-pub static POINT: c_uint = 0x1B00 as c_uint;
-pub static LINE: c_uint = 0x1B01 as c_uint;
-pub static FILL: c_uint = 0x1B02 as c_uint;
-pub static CW:  c_uint = 0x0900 as c_uint;
-pub static CCW: c_uint = 0x0901 as c_uint;
-pub static POLYGON_MODE: c_uint = 0x0B40 as c_uint;
-pub static POLYGON_SMOOTH: c_uint = 0x0B41 as c_uint;
-pub static POLYGON_STIPPLE: c_uint = 0x0B42 as c_uint;
-pub static EDGE_FLAG: c_uint = 0x0B43 as c_uint;
+pub const POINT: c_uint = 0x1B00 as c_uint;
+pub const LINE: c_uint = 0x1B01 as c_uint;
+pub const FILL: c_uint = 0x1B02 as c_uint;
+pub const CW:  c_uint = 0x0900 as c_uint;
+pub const CCW: c_uint = 0x0901 as c_uint;
+pub const POLYGON_MODE: c_uint = 0x0B40 as c_uint;
+pub const POLYGON_SMOOTH: c_uint = 0x0B41 as c_uint;
+pub const POLYGON_STIPPLE: c_uint = 0x0B42 as c_uint;
+pub const EDGE_FLAG: c_uint = 0x0B43 as c_uint;
 
 /* GetPName */
-pub static LINE_WIDTH:                    c_uint = 0x0B21 as c_uint;
-pub static ALIASED_POINT_SIZE_RANGE:      c_uint = 0x846D as c_uint;
-pub static ALIASED_LINE_WIDTH_RANGE:      c_uint = 0x846E as c_uint;
-pub static CULL_FACE_MODE:                c_uint = 0x0B45 as c_uint;
-pub static FRONT_FACE:                    c_uint = 0x0B46 as c_uint;
-pub static DEPTH_RANGE:                   c_uint = 0x0B70 as c_uint;
-pub static DEPTH_WRITEMASK:               c_uint = 0x0B72 as c_uint;
-pub static DEPTH_CLEAR_VALUE:             c_uint = 0x0B73 as c_uint;
-pub static DEPTH_FUNC:                    c_uint = 0x0B74 as c_uint;
-pub static STENCIL_CLEAR_VALUE:           c_uint = 0x0B91 as c_uint;
-pub static STENCIL_FUNC:                  c_uint = 0x0B92 as c_uint;
-pub static STENCIL_FAIL:                  c_uint = 0x0B94 as c_uint;
-pub static STENCIL_PASS_DEPTH_FAIL:       c_uint = 0x0B95 as c_uint;
-pub static STENCIL_PASS_DEPTH_PASS:       c_uint = 0x0B96 as c_uint;
-pub static STENCIL_REF:                   c_uint = 0x0B97 as c_uint;
-pub static STENCIL_VALUE_MASK:            c_uint = 0x0B93 as c_uint;
-pub static STENCIL_WRITEMASK:             c_uint = 0x0B98 as c_uint;
-pub static STENCIL_BACK_FUNC:             c_uint = 0x8800 as c_uint;
-pub static STENCIL_BACK_FAIL:             c_uint = 0x8801 as c_uint;
-pub static STENCIL_BACK_PASS_DEPTH_FAIL:  c_uint = 0x8802 as c_uint;
-pub static STENCIL_BACK_PASS_DEPTH_PASS:  c_uint = 0x8803 as c_uint;
-pub static STENCIL_BACK_REF:              c_uint = 0x8CA3 as c_uint;
-pub static STENCIL_BACK_VALUE_MASK:       c_uint = 0x8CA4 as c_uint;
-pub static STENCIL_BACK_WRITEMASK:        c_uint = 0x8CA5 as c_uint;
-pub static VIEWPORT:                      c_uint = 0x0BA2 as c_uint;
-pub static SCISSOR_BOX:                   c_uint = 0x0C10 as c_uint;
+pub const LINE_WIDTH:                    c_uint = 0x0B21 as c_uint;
+pub const ALIASED_POINT_SIZE_RANGE:      c_uint = 0x846D as c_uint;
+pub const ALIASED_LINE_WIDTH_RANGE:      c_uint = 0x846E as c_uint;
+pub const CULL_FACE_MODE:                c_uint = 0x0B45 as c_uint;
+pub const FRONT_FACE:                    c_uint = 0x0B46 as c_uint;
+pub const DEPTH_RANGE:                   c_uint = 0x0B70 as c_uint;
+pub const DEPTH_WRITEMASK:               c_uint = 0x0B72 as c_uint;
+pub const DEPTH_CLEAR_VALUE:             c_uint = 0x0B73 as c_uint;
+pub const DEPTH_FUNC:                    c_uint = 0x0B74 as c_uint;
+pub const STENCIL_CLEAR_VALUE:           c_uint = 0x0B91 as c_uint;
+pub const STENCIL_FUNC:                  c_uint = 0x0B92 as c_uint;
+pub const STENCIL_FAIL:                  c_uint = 0x0B94 as c_uint;
+pub const STENCIL_PASS_DEPTH_FAIL:       c_uint = 0x0B95 as c_uint;
+pub const STENCIL_PASS_DEPTH_PASS:       c_uint = 0x0B96 as c_uint;
+pub const STENCIL_REF:                   c_uint = 0x0B97 as c_uint;
+pub const STENCIL_VALUE_MASK:            c_uint = 0x0B93 as c_uint;
+pub const STENCIL_WRITEMASK:             c_uint = 0x0B98 as c_uint;
+pub const STENCIL_BACK_FUNC:             c_uint = 0x8800 as c_uint;
+pub const STENCIL_BACK_FAIL:             c_uint = 0x8801 as c_uint;
+pub const STENCIL_BACK_PASS_DEPTH_FAIL:  c_uint = 0x8802 as c_uint;
+pub const STENCIL_BACK_PASS_DEPTH_PASS:  c_uint = 0x8803 as c_uint;
+pub const STENCIL_BACK_REF:              c_uint = 0x8CA3 as c_uint;
+pub const STENCIL_BACK_VALUE_MASK:       c_uint = 0x8CA4 as c_uint;
+pub const STENCIL_BACK_WRITEMASK:        c_uint = 0x8CA5 as c_uint;
+pub const VIEWPORT:                      c_uint = 0x0BA2 as c_uint;
+pub const SCISSOR_BOX:                   c_uint = 0x0C10 as c_uint;
 /*      SCISSOR_TEST */
-pub static COLOR_CLEAR_VALUE:             c_uint = 0x0C22 as c_uint;
-pub static COLOR_WRITEMASK:               c_uint = 0x0C23 as c_uint;
-pub static UNPACK_ALIGNMENT:              c_uint = 0x0CF5 as c_uint;
-pub static PACK_ALIGNMENT:                c_uint = 0x0D05 as c_uint;
-pub static MAX_TEXTURE_SIZE:              c_uint = 0x0D33 as c_uint;
-pub static MAX_VIEWPORT_DIMS:             c_uint = 0x0D3A as c_uint;
-pub static SUBPIXEL_BITS:                 c_uint = 0x0D50 as c_uint;
-pub static RED_BITS:                      c_uint = 0x0D52 as c_uint;
-pub static GREEN_BITS:                    c_uint = 0x0D53 as c_uint;
-pub static BLUE_BITS:                     c_uint = 0x0D54 as c_uint;
-pub static ALPHA_BITS:                    c_uint = 0x0D55 as c_uint;
-pub static DEPTH_BITS:                    c_uint = 0x0D56 as c_uint;
-pub static STENCIL_BITS:                  c_uint = 0x0D57 as c_uint;
-pub static POLYGON_OFFSET_UNITS:          c_uint = 0x2A00 as c_uint;
+pub const COLOR_CLEAR_VALUE:             c_uint = 0x0C22 as c_uint;
+pub const COLOR_WRITEMASK:               c_uint = 0x0C23 as c_uint;
+pub const UNPACK_ALIGNMENT:              c_uint = 0x0CF5 as c_uint;
+pub const PACK_ALIGNMENT:                c_uint = 0x0D05 as c_uint;
+pub const MAX_TEXTURE_SIZE:              c_uint = 0x0D33 as c_uint;
+pub const MAX_VIEWPORT_DIMS:             c_uint = 0x0D3A as c_uint;
+pub const SUBPIXEL_BITS:                 c_uint = 0x0D50 as c_uint;
+pub const RED_BITS:                      c_uint = 0x0D52 as c_uint;
+pub const GREEN_BITS:                    c_uint = 0x0D53 as c_uint;
+pub const BLUE_BITS:                     c_uint = 0x0D54 as c_uint;
+pub const ALPHA_BITS:                    c_uint = 0x0D55 as c_uint;
+pub const DEPTH_BITS:                    c_uint = 0x0D56 as c_uint;
+pub const STENCIL_BITS:                  c_uint = 0x0D57 as c_uint;
+pub const POLYGON_OFFSET_UNITS:          c_uint = 0x2A00 as c_uint;
 /*      POLYGON_OFFSET_FILL */
-pub static POLYGON_OFFSET_FACTOR:         c_uint = 0x8038 as c_uint;
-pub static TEXTURE_BINDING_2D:            c_uint = 0x8069 as c_uint;
-pub static SAMPLE_BUFFERS:                c_uint = 0x80A8 as c_uint;
-pub static SAMPLES:                       c_uint = 0x80A9 as c_uint;
-pub static SAMPLE_COVERAGE_VALUE:         c_uint = 0x80AA as c_uint;
-pub static SAMPLE_COVERAGE_INVERT:        c_uint = 0x80AB as c_uint;
+pub const POLYGON_OFFSET_FACTOR:         c_uint = 0x8038 as c_uint;
+pub const TEXTURE_BINDING_2D:            c_uint = 0x8069 as c_uint;
+pub const SAMPLE_BUFFERS:                c_uint = 0x80A8 as c_uint;
+pub const SAMPLES:                       c_uint = 0x80A9 as c_uint;
+pub const SAMPLE_COVERAGE_VALUE:         c_uint = 0x80AA as c_uint;
+pub const SAMPLE_COVERAGE_INVERT:        c_uint = 0x80AB as c_uint;
 
 /* GetTarget */
-pub static UNPACK_ROW_LENGTH: c_uint = 0x0CF2 as c_uint;
+pub const UNPACK_ROW_LENGTH: c_uint = 0x0CF2 as c_uint;
 
 /* PixelFormat */
-pub static DEPTH_COMPONENT: c_uint = 0x1902 as c_uint;
-pub static RED:             c_uint = 0x1903 as c_uint;
-pub static GREEN:           c_uint = 0x1904 as c_uint;
-pub static BLUE:            c_uint = 0x1905 as c_uint;
-pub static ALPHA:           c_uint = 0x1906 as c_uint;
-pub static RGB:             c_uint = 0x1907 as c_uint;
-pub static RGBA:            c_uint = 0x1908 as c_uint;
+pub const DEPTH_COMPONENT: c_uint = 0x1902 as c_uint;
+pub const RED:             c_uint = 0x1903 as c_uint;
+pub const GREEN:           c_uint = 0x1904 as c_uint;
+pub const BLUE:            c_uint = 0x1905 as c_uint;
+pub const ALPHA:           c_uint = 0x1906 as c_uint;
+pub const RGB:             c_uint = 0x1907 as c_uint;
+pub const RGBA:            c_uint = 0x1908 as c_uint;
 
-pub static BGRA:            c_uint = 0x80e1 as c_uint;   // NB: Not OpenGL ES!
-pub static RGBA8:           c_uint = 0x8058 as c_uint;   // NB: Not OpenGL ES!
+pub const BGRA:            c_uint = 0x80e1 as c_uint;   // NB: Not OpenGL ES!
+pub const RGBA8:           c_uint = 0x8058 as c_uint;   // NB: Not OpenGL ES!
 
 /* Packed Pixels */
-pub static UNSIGNED_INT_8_8_8_8_REV: c_uint = 0x8367 as c_uint; // NB: Not OpenGL ES!
+pub const UNSIGNED_INT_8_8_8_8_REV: c_uint = 0x8367 as c_uint; // NB: Not OpenGL ES!
 
 /* Shaders */
-pub static FRAGMENT_SHADER:                  c_uint = 0x8B30 as c_uint;
-pub static VERTEX_SHADER:                    c_uint = 0x8B31 as c_uint;
-pub static MAX_VERTEX_ATTRIBS:               c_uint = 0x8869 as c_uint;
-pub static MAX_VERTEX_UNIFORM_VECTORS:       c_uint = 0x8DFB as c_uint;
-pub static MAX_VARYING_VECTORS:              c_uint = 0x8DFC as c_uint;
-pub static MAX_COMBINED_TEXTURE_IMAGE_UNITS: c_uint = 0x8B4D as c_uint;
-pub static MAX_VERTEX_TEXTURE_IMAGE_UNITS:   c_uint = 0x8B4C as c_uint;
-pub static MAX_TEXTURE_IMAGE_UNITS:          c_uint = 0x8872 as c_uint;
-pub static MAX_FRAGMENT_UNIFORM_VECTORS:     c_uint = 0x8DFD as c_uint;
-pub static SHADER_TYPE:                      c_uint = 0x8B4F as c_uint;
-pub static DELETE_STATUS:                    c_uint = 0x8B80 as c_uint;
-pub static LINK_STATUS:                      c_uint = 0x8B82 as c_uint;
-pub static VALIDATE_STATUS:                  c_uint = 0x8B83 as c_uint;
-pub static ATTACHED_SHADERS:                 c_uint = 0x8B85 as c_uint;
-pub static ACTIVE_UNIFORMS:                  c_uint = 0x8B86 as c_uint;
-pub static ACTIVE_UNIFORM_MAX_LENGTH:        c_uint = 0x8B87 as c_uint;
-pub static ACTIVE_ATTRIBUTES:                c_uint = 0x8B89 as c_uint;
-pub static ACTIVE_ATTRIBUTE_MAX_LENGTH:      c_uint = 0x8B8A as c_uint;
-pub static SHADING_LANGUAGE_VERSION:         c_uint = 0x8B8C as c_uint;
-pub static CURRENT_PROGRAM:                  c_uint = 0x8B8D as c_uint;
+pub const FRAGMENT_SHADER:                  c_uint = 0x8B30 as c_uint;
+pub const VERTEX_SHADER:                    c_uint = 0x8B31 as c_uint;
+pub const MAX_VERTEX_ATTRIBS:               c_uint = 0x8869 as c_uint;
+pub const MAX_VERTEX_UNIFORM_VECTORS:       c_uint = 0x8DFB as c_uint;
+pub const MAX_VARYING_VECTORS:              c_uint = 0x8DFC as c_uint;
+pub const MAX_COMBINED_TEXTURE_IMAGE_UNITS: c_uint = 0x8B4D as c_uint;
+pub const MAX_VERTEX_TEXTURE_IMAGE_UNITS:   c_uint = 0x8B4C as c_uint;
+pub const MAX_TEXTURE_IMAGE_UNITS:          c_uint = 0x8872 as c_uint;
+pub const MAX_FRAGMENT_UNIFORM_VECTORS:     c_uint = 0x8DFD as c_uint;
+pub const SHADER_TYPE:                      c_uint = 0x8B4F as c_uint;
+pub const DELETE_STATUS:                    c_uint = 0x8B80 as c_uint;
+pub const LINK_STATUS:                      c_uint = 0x8B82 as c_uint;
+pub const VALIDATE_STATUS:                  c_uint = 0x8B83 as c_uint;
+pub const ATTACHED_SHADERS:                 c_uint = 0x8B85 as c_uint;
+pub const ACTIVE_UNIFORMS:                  c_uint = 0x8B86 as c_uint;
+pub const ACTIVE_UNIFORM_MAX_LENGTH:        c_uint = 0x8B87 as c_uint;
+pub const ACTIVE_ATTRIBUTES:                c_uint = 0x8B89 as c_uint;
+pub const ACTIVE_ATTRIBUTE_MAX_LENGTH:      c_uint = 0x8B8A as c_uint;
+pub const SHADING_LANGUAGE_VERSION:         c_uint = 0x8B8C as c_uint;
+pub const CURRENT_PROGRAM:                  c_uint = 0x8B8D as c_uint;
 
 /* StencilFunction */
-pub static NEVER:    c_uint = 0x0200 as c_uint;
-pub static LESS:     c_uint = 0x0201 as c_uint;
-pub static EQUAL:    c_uint = 0x0202 as c_uint;
-pub static LEQUAL:   c_uint = 0x0203 as c_uint;
-pub static GREATER:  c_uint = 0x0204 as c_uint;
-pub static NOTEQUAL: c_uint = 0x0205 as c_uint;
-pub static GEQUAL:   c_uint = 0x0206 as c_uint;
-pub static ALWAYS:   c_uint = 0x0207 as c_uint;
-
-pub static VENDOR:     c_uint = 0x1F00 as c_uint;
-pub static RENDERER:   c_uint = 0x1F01 as c_uint;
-pub static VERSION:    c_uint = 0x1F02 as c_uint;
-pub static EXTENSIONS: c_uint = 0x1F03 as c_uint;
+pub const NEVER:    c_uint = 0x0200 as c_uint;
+pub const LESS:     c_uint = 0x0201 as c_uint;
+pub const EQUAL:    c_uint = 0x0202 as c_uint;
+pub const LEQUAL:   c_uint = 0x0203 as c_uint;
+pub const GREATER:  c_uint = 0x0204 as c_uint;
+pub const NOTEQUAL: c_uint = 0x0205 as c_uint;
+pub const GEQUAL:   c_uint = 0x0206 as c_uint;
+pub const ALWAYS:   c_uint = 0x0207 as c_uint;
+
+pub const VENDOR:     c_uint = 0x1F00 as c_uint;
+pub const RENDERER:   c_uint = 0x1F01 as c_uint;
+pub const VERSION:    c_uint = 0x1F02 as c_uint;
+pub const EXTENSIONS: c_uint = 0x1F03 as c_uint;
 
 /* Shader Source */
-pub static COMPILE_STATUS:       c_uint = 0x8B81 as c_uint;
-pub static INFO_LOG_LENGTH:      c_uint = 0x8B84 as c_uint;
-pub static SHADER_SOURCE_LENGTH: c_uint = 0x8B88 as c_uint;
-pub static SHADER_COMPILER:      c_uint = 0x8DFA as c_uint;
+pub const COMPILE_STATUS:       c_uint = 0x8B81 as c_uint;
+pub const INFO_LOG_LENGTH:      c_uint = 0x8B84 as c_uint;
+pub const SHADER_SOURCE_LENGTH: c_uint = 0x8B88 as c_uint;
+pub const SHADER_COMPILER:      c_uint = 0x8DFA as c_uint;
 
 /* Buffer Objects */
-pub static ARRAY_BUFFER:                 c_uint = 0x8892 as c_uint;
-pub static ELEMENT_ARRAY_BUFFER:         c_uint = 0x8893 as c_uint;
-pub static ARRAY_BUFFER_BINDING:         c_uint = 0x8894 as c_uint;
-pub static ELEMENT_ARRAY_BUFFER_BINDING: c_uint = 0x8895 as c_uint;
+pub const ARRAY_BUFFER:                 c_uint = 0x8892 as c_uint;
+pub const ELEMENT_ARRAY_BUFFER:         c_uint = 0x8893 as c_uint;
+pub const ARRAY_BUFFER_BINDING:         c_uint = 0x8894 as c_uint;
+pub const ELEMENT_ARRAY_BUFFER_BINDING: c_uint = 0x8895 as c_uint;
 
-pub static STREAM_DRAW:  c_uint = 0x88E0 as c_uint;
-pub static STATIC_DRAW:  c_uint = 0x88E4 as c_uint;
-pub static DYNAMIC_DRAW: c_uint = 0x88E8 as c_uint;
+pub const STREAM_DRAW:  c_uint = 0x88E0 as c_uint;
+pub const STATIC_DRAW:  c_uint = 0x88E4 as c_uint;
+pub const DYNAMIC_DRAW: c_uint = 0x88E8 as c_uint;
 
 /* CullFaceMode */
-pub static FRONT: c_uint =           0x0404 as c_uint;
-pub static BACK: c_uint =            0x0405 as c_uint;
-pub static FRONT_AND_BACK: c_uint =  0x0408 as c_uint;
+pub const FRONT: c_uint =           0x0404 as c_uint;
+pub const BACK: c_uint =            0x0405 as c_uint;
+pub const FRONT_AND_BACK: c_uint =  0x0408 as c_uint;
 
 /* TextureMagFilter */
-pub static NEAREST: c_uint = 0x2600 as c_uint;
-pub static LINEAR:  c_uint = 0x2601 as c_uint;
+pub const NEAREST: c_uint = 0x2600 as c_uint;
+pub const LINEAR:  c_uint = 0x2601 as c_uint;
 
 /* TextureParameterName */
-pub static TEXTURE_MAG_FILTER: c_uint = 0x2800 as c_uint;
-pub static TEXTURE_MIN_FILTER: c_uint = 0x2801 as c_uint;
-pub static TEXTURE_WRAP_S:     c_uint = 0x2802 as c_uint;
-pub static TEXTURE_WRAP_T:     c_uint = 0x2803 as c_uint;
+pub const TEXTURE_MAG_FILTER: c_uint = 0x2800 as c_uint;
+pub const TEXTURE_MIN_FILTER: c_uint = 0x2801 as c_uint;
+pub const TEXTURE_WRAP_S:     c_uint = 0x2802 as c_uint;
+pub const TEXTURE_WRAP_T:     c_uint = 0x2803 as c_uint;
 
 /* TextureUnit */
-pub static TEXTURE0:       c_uint = 0x84C0 as c_uint;
-pub static TEXTURE1:       c_uint = 0x84C1 as c_uint;
-pub static TEXTURE2:       c_uint = 0x84C2 as c_uint;
-pub static TEXTURE3:       c_uint = 0x84C3 as c_uint;
-pub static TEXTURE4:       c_uint = 0x84C4 as c_uint;
-pub static TEXTURE5:       c_uint = 0x84C5 as c_uint;
-pub static TEXTURE6:       c_uint = 0x84C6 as c_uint;
-pub static TEXTURE7:       c_uint = 0x84C7 as c_uint;
-pub static TEXTURE8:       c_uint = 0x84C8 as c_uint;
-pub static TEXTURE9:       c_uint = 0x84C9 as c_uint;
-pub static TEXTURE10:      c_uint = 0x84CA as c_uint;
-pub static TEXTURE11:      c_uint = 0x84CB as c_uint;
-pub static TEXTURE12:      c_uint = 0x84CC as c_uint;
-pub static TEXTURE13:      c_uint = 0x84CD as c_uint;
-pub static TEXTURE14:      c_uint = 0x84CE as c_uint;
-pub static TEXTURE15:      c_uint = 0x84CF as c_uint;
-pub static TEXTURE16:      c_uint = 0x84D0 as c_uint;
-pub static TEXTURE17:      c_uint = 0x84D1 as c_uint;
-pub static TEXTURE18:      c_uint = 0x84D2 as c_uint;
-pub static TEXTURE19:      c_uint = 0x84D3 as c_uint;
-pub static TEXTURE20:      c_uint = 0x84D4 as c_uint;
-pub static TEXTURE21:      c_uint = 0x84D5 as c_uint;
-pub static TEXTURE22:      c_uint = 0x84D6 as c_uint;
-pub static TEXTURE23:      c_uint = 0x84D7 as c_uint;
-pub static TEXTURE24:      c_uint = 0x84D8 as c_uint;
-pub static TEXTURE25:      c_uint = 0x84D9 as c_uint;
-pub static TEXTURE26:      c_uint = 0x84DA as c_uint;
-pub static TEXTURE27:      c_uint = 0x84DB as c_uint;
-pub static TEXTURE28:      c_uint = 0x84DC as c_uint;
-pub static TEXTURE29:      c_uint = 0x84DD as c_uint;
-pub static TEXTURE30:      c_uint = 0x84DE as c_uint;
-pub static TEXTURE31:      c_uint = 0x84DF as c_uint;
-pub static ACTIVE_TEXTURE: c_uint = 0x84E0 as c_uint;
+pub const TEXTURE0:       c_uint = 0x84C0 as c_uint;
+pub const TEXTURE1:       c_uint = 0x84C1 as c_uint;
+pub const TEXTURE2:       c_uint = 0x84C2 as c_uint;
+pub const TEXTURE3:       c_uint = 0x84C3 as c_uint;
+pub const TEXTURE4:       c_uint = 0x84C4 as c_uint;
+pub const TEXTURE5:       c_uint = 0x84C5 as c_uint;
+pub const TEXTURE6:       c_uint = 0x84C6 as c_uint;
+pub const TEXTURE7:       c_uint = 0x84C7 as c_uint;
+pub const TEXTURE8:       c_uint = 0x84C8 as c_uint;
+pub const TEXTURE9:       c_uint = 0x84C9 as c_uint;
+pub const TEXTURE10:      c_uint = 0x84CA as c_uint;
+pub const TEXTURE11:      c_uint = 0x84CB as c_uint;
+pub const TEXTURE12:      c_uint = 0x84CC as c_uint;
+pub const TEXTURE13:      c_uint = 0x84CD as c_uint;
+pub const TEXTURE14:      c_uint = 0x84CE as c_uint;
+pub const TEXTURE15:      c_uint = 0x84CF as c_uint;
+pub const TEXTURE16:      c_uint = 0x84D0 as c_uint;
+pub const TEXTURE17:      c_uint = 0x84D1 as c_uint;
+pub const TEXTURE18:      c_uint = 0x84D2 as c_uint;
+pub const TEXTURE19:      c_uint = 0x84D3 as c_uint;
+pub const TEXTURE20:      c_uint = 0x84D4 as c_uint;
+pub const TEXTURE21:      c_uint = 0x84D5 as c_uint;
+pub const TEXTURE22:      c_uint = 0x84D6 as c_uint;
+pub const TEXTURE23:      c_uint = 0x84D7 as c_uint;
+pub const TEXTURE24:      c_uint = 0x84D8 as c_uint;
+pub const TEXTURE25:      c_uint = 0x84D9 as c_uint;
+pub const TEXTURE26:      c_uint = 0x84DA as c_uint;
+pub const TEXTURE27:      c_uint = 0x84DB as c_uint;
+pub const TEXTURE28:      c_uint = 0x84DC as c_uint;
+pub const TEXTURE29:      c_uint = 0x84DD as c_uint;
+pub const TEXTURE30:      c_uint = 0x84DE as c_uint;
+pub const TEXTURE31:      c_uint = 0x84DF as c_uint;
+pub const ACTIVE_TEXTURE: c_uint = 0x84E0 as c_uint;
 
 /* TextureWrapMode */
-pub static REPEAT:          c_uint = 0x2901 as c_uint;
-pub static CLAMP_TO_EDGE:   c_uint = 0x812F as c_uint;
-pub static MIRRORED_REPEAT: c_uint = 0x8370 as c_uint;
+pub const REPEAT:          c_uint = 0x2901 as c_uint;
+pub const CLAMP_TO_EDGE:   c_uint = 0x812F as c_uint;
+pub const MIRRORED_REPEAT: c_uint = 0x8370 as c_uint;
 
-pub static COLOR_ATTACHMENT0: c_uint = 0x8CE0 as c_uint;
+pub const COLOR_ATTACHMENT0: c_uint = 0x8CE0 as c_uint;
 
-pub static FRAMEBUFFER_COMPLETE: c_uint = 0x8CD5 as c_uint;
+pub const FRAMEBUFFER_COMPLETE: c_uint = 0x8CD5 as c_uint;
 
 // Framebuffer Object
-pub static FRAMEBUFFER:  c_uint = 0x8D40 as c_uint;
-pub static RENDERBUFFER: c_uint = 0x8D41 as c_uint;
+pub const FRAMEBUFFER:  c_uint = 0x8D40 as c_uint;
+pub const RENDERBUFFER: c_uint = 0x8D41 as c_uint;
 
 // Extensions
-pub static TEXTURE_RECTANGLE_ARB: c_uint = 0x84F5 as c_uint;         // NB: Not OpenGL ES!
+pub const TEXTURE_RECTANGLE_ARB: c_uint = 0x84F5 as c_uint;         // NB: Not OpenGL ES!
 
-pub static UNPACK_CLIENT_STORAGE_APPLE: c_uint = 0x85B2 as c_uint;   // NB: Not OpenGL ES!
-pub static TEXTURE_STORAGE_HINT_APPLE: c_uint = 0x85BC as c_uint;    // NB: Not OpenGL ES!
-pub static STORAGE_CACHED_APPLE: c_uint = 0x85BE as c_uint;          // NB: Not OpenGL ES!
-pub static STORAGE_SHARED_APPLE: c_uint = 0x85BF as c_uint;          // NB: Not OpenGL ES!
+pub const UNPACK_CLIENT_STORAGE_APPLE: c_uint = 0x85B2 as c_uint;   // NB: Not OpenGL ES!
+pub const TEXTURE_STORAGE_HINT_APPLE: c_uint = 0x85BC as c_uint;    // NB: Not OpenGL ES!
+pub const STORAGE_CACHED_APPLE: c_uint = 0x85BE as c_uint;          // NB: Not OpenGL ES!
+pub const STORAGE_SHARED_APPLE: c_uint = 0x85BF as c_uint;          // NB: Not OpenGL ES!
 
 
 // Types
@@ -400,8 +400,7 @@ pub fn bind_texture(target: GLenum, texture: GLuint) {
     }
 }
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn bind_vertex_array(array: GLuint) {
     unsafe {
         glBindVertexArray(array);
@@ -438,8 +437,7 @@ pub fn blend_func_separate(src_rgb: GLenum, dst_rgb: GLenum, src_alpha: GLenum,
     }
 }
 // FIXME: There should be some type-safe wrapper for this...
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn buffer_data<T>(target: GLenum, data: &[T], usage: GLenum) {
     unsafe {
         glBufferData(target,
@@ -590,16 +588,15 @@ pub fn draw_elements(mode: GLenum, count: GLsizei, element_type: GLenum, indices
     }
 }
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn draw_arrays_instanced(mode: GLenum, first: GLint, count: GLsizei, primcount: GLsizei) {
     unsafe {
         glDrawArraysInstanced(mode, first, count, primcount);
     }
 }
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn draw_elements_instanced(mode: GLenum, count: GLsizei, element_type: GLenum, indices: Option<&[u8]>, primcount: GLsizei) {
     unsafe {
         glDrawElementsInstanced(mode,
@@ -692,8 +689,7 @@ pub fn gen_textures(n: GLsizei) -> Vec<GLuint> {
     }
 }
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn gen_vertex_arrays(n: GLsizei) -> Vec<GLuint> {
     unsafe {
         let mut result = Vec::from_elem(n as uint, 0 as GLuint);
@@ -850,11 +846,11 @@ pub fn read_pixels(x: GLint, y: GLint, width: GLsizei, height: GLsizei, format:
     let colors = match format {
         RGB => 3,
         RGBA => 3,
-        _ => fail!("unsupported format for read_pixels"),
+        _ => panic!("unsupported format for read_pixels"),
     };
     let depth = match pixel_type {
         UNSIGNED_BYTE => 1,
-        _ => fail!("unsupported pixel_type for read_pixels"),
+        _ => panic!("unsupported pixel_type for read_pixels"),
     };
 
     let len = (width * height * colors * depth) as uint;
@@ -1059,8 +1055,7 @@ pub fn vertex_attrib_pointer_u8(index: GLuint,
     }
 }
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6), not(mac_10_7))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn vertex_attrib_divisor(index: GLuint, divisor: GLuint) {
     unsafe {
         glVertexAttribDivisor(index, divisor);
@@ -1118,8 +1113,7 @@ pub fn glBindRenderbuffer(target: GLenum, renderbuffer: GLuint);
 
 pub fn glBindTexture(target: GLenum, texture: GLuint);
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn glBindVertexArray(array: GLuint);
 
 pub fn glBlendColor(red: GLclampf, green: GLclampf, blue: GLclampf, alpha: GLclampf);
@@ -1195,12 +1189,10 @@ pub fn glDrawArrays(mode: GLenum, first: GLint, count: GLsizei);
 
 pub fn glDrawElements(mode: GLenum, count: GLsizei, _type: GLenum, indices: *const GLvoid);
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn glDrawArraysInstanced(mode: GLenum, first: GLint, count: GLsizei, primcount: GLsizei);
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn glDrawElementsInstanced(mode: GLenum, count: GLsizei, _type: GLenum, indices: *const GLvoid, primcount: GLsizei);
 
 pub fn glEnable(cap: GLenum);
@@ -1227,8 +1219,7 @@ pub fn glGenRenderbuffers(n: GLsizei, renderbuffers: *mut GLuint);
 
 pub fn glGenTextures(n: GLsizei, textures: *mut GLuint);
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn glGenVertexArrays(n: GLsizei, arrays: *mut GLuint);
 
 pub fn glGetActiveAttrib(program: GLuint, index: GLuint, bufsize: GLsizei, length: *mut GLsizei, size: *mut GLint, _type: *mut GLenum, name: *mut GLchar);
@@ -1411,8 +1402,7 @@ pub fn glVertexAttrib4fv(indx: GLuint, values: *mut GLfloat);
 
 pub fn glVertexAttribPointer(indx: GLuint, size: GLint, _type: GLenum, normalized: GLboolean, stride: GLsizei, ptr: *const GLvoid);
 
-#[cfg(not(target_os="android"), not(target_os="macos"))]
-#[cfg(not(target_os="android"), not(mac_10_6), not(mac_10_7))]
+#[cfg(not(any(target_os="android", target_os="macos", mac_10_6)))]
 pub fn glVertexAttribDivisor(indx: GLuint, divisor: GLuint);
 
 pub fn glViewport(x: GLint, y: GLint, width: GLsizei, height: GLsizei);