+//GL_ARB_framebuffer_object
+// (slight differences from GL_EXT_framebuffer_object as this integrates GL_EXT_packed_depth_stencil)
+#ifndef GL_FRAMEBUFFER
+#define GL_FRAMEBUFFER 0x8D40
+#define GL_READ_FRAMEBUFFER 0x8CA8
+#define GL_DRAW_FRAMEBUFFER 0x8CA9
+#define GL_RENDERBUFFER 0x8D41
+#define GL_STENCIL_INDEX1 0x8D46
+#define GL_STENCIL_INDEX4 0x8D47
+#define GL_STENCIL_INDEX8 0x8D48
+#define GL_STENCIL_INDEX16 0x8D49
+#define GL_RENDERBUFFER_WIDTH 0x8D42
+#define GL_RENDERBUFFER_HEIGHT 0x8D43
+#define GL_RENDERBUFFER_INTERNAL_FORMAT 0x8D44
+#define GL_RENDERBUFFER_RED_SIZE 0x8D50
+#define GL_RENDERBUFFER_GREEN_SIZE 0x8D51
+#define GL_RENDERBUFFER_BLUE_SIZE 0x8D52
+#define GL_RENDERBUFFER_ALPHA_SIZE 0x8D53
+#define GL_RENDERBUFFER_DEPTH_SIZE 0x8D54
+#define GL_RENDERBUFFER_STENCIL_SIZE 0x8D55
+#define GL_RENDERBUFFER_SAMPLES 0x8CAB
+#define GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE 0x8CD0
+#define GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME 0x8CD1
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL 0x8CD2
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE 0x8CD3
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER 0x8CD4
+#define GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING 0x8210
+#define GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE 0x8211
+#define GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE 0x8212
+#define GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE 0x8213
+#define GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE 0x8214
+#define GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE 0x8215
+#define GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE 0x8216
+#define GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE 0x8217
+#define GL_SRGB 0x8C40
+#define GL_UNSIGNED_NORMALIZED 0x8C17
+#define GL_FRAMEBUFFER_DEFAULT 0x8218
+#define GL_INDEX 0x8222
+#define GL_COLOR_ATTACHMENT0 0x8CE0
+#define GL_COLOR_ATTACHMENT1 0x8CE1
+#define GL_COLOR_ATTACHMENT2 0x8CE2
+#define GL_COLOR_ATTACHMENT3 0x8CE3
+#define GL_COLOR_ATTACHMENT4 0x8CE4
+#define GL_COLOR_ATTACHMENT5 0x8CE5
+#define GL_COLOR_ATTACHMENT6 0x8CE6
+#define GL_COLOR_ATTACHMENT7 0x8CE7
+#define GL_COLOR_ATTACHMENT8 0x8CE8
+#define GL_COLOR_ATTACHMENT9 0x8CE9
+#define GL_COLOR_ATTACHMENT10 0x8CEA
+#define GL_COLOR_ATTACHMENT11 0x8CEB
+#define GL_COLOR_ATTACHMENT12 0x8CEC
+#define GL_COLOR_ATTACHMENT13 0x8CED
+#define GL_COLOR_ATTACHMENT14 0x8CEE
+#define GL_COLOR_ATTACHMENT15 0x8CEF
+#define GL_DEPTH_ATTACHMENT 0x8D00
+#define GL_STENCIL_ATTACHMENT 0x8D20
+#define GL_DEPTH_STENCIL_ATTACHMENT 0x821A
+#define GL_MAX_SAMPLES 0x8D57
+#define GL_FRAMEBUFFER_COMPLETE 0x8CD5
+#define GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT 0x8CD6
+#define GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT 0x8CD7
+#define GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER 0x8CDB
+#define GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER 0x8CDC
+#define GL_FRAMEBUFFER_UNSUPPORTED 0x8CDD
+#define GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE 0x8D56
+#define GL_FRAMEBUFFER_UNDEFINED 0x8219
+#define GL_FRAMEBUFFER_BINDING 0x8CA6 // alias DRAW_FRAMEBUFFER_BINDING
+#define GL_DRAW_FRAMEBUFFER_BINDING 0x8CA6
+#define GL_READ_FRAMEBUFFER_BINDING 0x8CAA
+#define GL_RENDERBUFFER_BINDING 0x8CA7
+#define GL_MAX_COLOR_ATTACHMENTS 0x8CDF
+#define GL_MAX_RENDERBUFFER_SIZE 0x84E8
+#define GL_INVALID_FRAMEBUFFER_OPERATION 0x0506
+#define GL_DEPTH_STENCIL 0x84F9
+#define GL_UNSIGNED_INT_24_8 0x84FA
+#define GL_DEPTH24_STENCIL8 0x88F0
+#define GL_TEXTURE_STENCIL_SIZE 0x88F1
+#endif
+extern GLboolean (GLAPIENTRY *qglIsRenderbuffer)(GLuint renderbuffer);
+extern GLvoid (GLAPIENTRY *qglBindRenderbuffer)(GLenum target, GLuint renderbuffer);
+extern GLvoid (GLAPIENTRY *qglDeleteRenderbuffers)(GLsizei n, const GLuint *renderbuffers);
+extern GLvoid (GLAPIENTRY *qglGenRenderbuffers)(GLsizei n, GLuint *renderbuffers);
+extern GLvoid (GLAPIENTRY *qglRenderbufferStorage)(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
+extern GLvoid (GLAPIENTRY *qglRenderbufferStorageMultisample)(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height);
+extern GLvoid (GLAPIENTRY *qglGetRenderbufferParameteriv)(GLenum target, GLenum pname, GLint *params);
+extern GLboolean (GLAPIENTRY *qglIsFramebuffer)(GLuint framebuffer);
+extern GLvoid (GLAPIENTRY *qglBindFramebuffer)(GLenum target, GLuint framebuffer);
+extern GLvoid (GLAPIENTRY *qglDeleteFramebuffers)(GLsizei n, const GLuint *framebuffers);
+extern GLvoid (GLAPIENTRY *qglGenFramebuffers)(GLsizei n, GLuint *framebuffers);
+extern GLenum (GLAPIENTRY *qglCheckFramebufferStatus)(GLenum target);
+extern GLvoid (GLAPIENTRY *qglFramebufferTexture1D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+extern GLvoid (GLAPIENTRY *qglFramebufferTexture2D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+extern GLvoid (GLAPIENTRY *qglFramebufferTexture3D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level, GLint layer);
+extern GLvoid (GLAPIENTRY *qglFramebufferTextureLayer)(GLenum target, GLenum attachment, GLuint texture, GLint level, GLint layer);
+extern GLvoid (GLAPIENTRY *qglFramebufferRenderbuffer)(GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+extern GLvoid (GLAPIENTRY *qglGetFramebufferAttachmentParameteriv)(GLenum target, GLenum attachment, GLenum pname, GLint *params);
+extern GLvoid (GLAPIENTRY *qglBlitFramebuffer)(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+extern GLvoid (GLAPIENTRY *qglGenerateMipmap)(GLenum target);
+
+// GL_ARB_draw_buffers
+#ifndef GL_MAX_DRAW_BUFFERS_ARB
+#define GL_MAX_DRAW_BUFFERS_ARB 0x8824
+#define GL_DRAW_BUFFER0_ARB 0x8825
+#define GL_DRAW_BUFFER1_ARB 0x8826
+#define GL_DRAW_BUFFER2_ARB 0x8827
+#define GL_DRAW_BUFFER3_ARB 0x8828
+#define GL_DRAW_BUFFER4_ARB 0x8829
+#define GL_DRAW_BUFFER5_ARB 0x882A
+#define GL_DRAW_BUFFER6_ARB 0x882B
+#define GL_DRAW_BUFFER7_ARB 0x882C
+#define GL_DRAW_BUFFER8_ARB 0x882D
+#define GL_DRAW_BUFFER9_ARB 0x882E
+#define GL_DRAW_BUFFER10_ARB 0x882F
+#define GL_DRAW_BUFFER11_ARB 0x8830
+#define GL_DRAW_BUFFER12_ARB 0x8831
+#define GL_DRAW_BUFFER13_ARB 0x8832
+#define GL_DRAW_BUFFER14_ARB 0x8833
+#define GL_DRAW_BUFFER15_ARB 0x8834
+#endif
+extern void (GLAPIENTRY *qglDrawBuffersARB)(GLsizei n, const GLenum *bufs);
+
+// GL_ARB_texture_float
+#ifndef GL_RGBA32F_ARB
+#define GL_RGBA32F_ARB 0x8814
+#define GL_RGB32F_ARB 0x8815
+#define GL_ALPHA32F_ARB 0x8816
+#define GL_INTENSITY32F_ARB 0x8817
+#define GL_LUMINANCE32F_ARB 0x8818
+#define GL_LUMINANCE_ALPHA32F_ARB 0x8819
+#define GL_RGBA16F_ARB 0x881A
+#define GL_RGB16F_ARB 0x881B
+#define GL_ALPHA16F_ARB 0x881C
+#define GL_INTENSITY16F_ARB 0x881D
+#define GL_LUMINANCE16F_ARB 0x881E
+#define GL_LUMINANCE_ALPHA16F_ARB 0x881F
+#endif
+
+// GL_ARB_half_float_pixel
+#ifndef GL_HALF_FLOAT_ARB
+typedef unsigned short GLhalfARB;
+#define GL_HALF_FLOAT_ARB 0x140B
+#endif
+
+// GL_EXT_texture_sRGB
+#ifndef GL_SRGB_EXT
+#define GL_SRGB_EXT 0x8C40
+#define GL_SRGB8_EXT 0x8C41
+#define GL_SRGB_ALPHA_EXT 0x8C42
+#define GL_SRGB8_ALPHA8_EXT 0x8C43
+#define GL_SLUMINANCE_ALPHA_EXT 0x8C44
+#define GL_SLUMINANCE8_ALPHA8_EXT 0x8C45
+#define GL_SLUMINANCE_EXT 0x8C46
+#define GL_SLUMINANCE8_EXT 0x8C47
+#define GL_COMPRESSED_SRGB_EXT 0x8C48
+#define GL_COMPRESSED_SRGB_ALPHA_EXT 0x8C49
+#define GL_COMPRESSED_SLUMINANCE_EXT 0x8C4A
+#define GL_COMPRESSED_SLUMINANCE_ALPHA_EXT 0x8C4B
+#define GL_COMPRESSED_SRGB_S3TC_DXT1_EXT 0x8C4C
+#define GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT 0x8C4D
+#define GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT 0x8C4E
+#define GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT 0x8C4F
+#endif
+
+// GL_ARB_uniform_buffer_object
+#ifndef GL_UNIFORM_BUFFER
+#define GL_UNIFORM_BUFFER 0x8A11
+#define GL_UNIFORM_BUFFER_BINDING 0x8A28
+#define GL_UNIFORM_BUFFER_START 0x8A29
+#define GL_UNIFORM_BUFFER_SIZE 0x8A2A
+#define GL_MAX_VERTEX_UNIFORM_BLOCKS 0x8A2B
+#define GL_MAX_GEOMETRY_UNIFORM_BLOCKS 0x8A2C
+#define GL_MAX_FRAGMENT_UNIFORM_BLOCKS 0x8A2D
+#define GL_MAX_COMBINED_UNIFORM_BLOCKS 0x8A2E
+#define GL_MAX_UNIFORM_BUFFER_BINDINGS 0x8A2F
+#define GL_MAX_UNIFORM_BLOCK_SIZE 0x8A30
+#define GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS 0x8A31
+#define GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS 0x8A32
+#define GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS 0x8A33
+#define GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT 0x8A34
+#define GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH 0x8A35
+#define GL_ACTIVE_UNIFORM_BLOCKS 0x8A36
+#define GL_UNIFORM_TYPE 0x8A37
+#define GL_UNIFORM_SIZE 0x8A38
+#define GL_UNIFORM_NAME_LENGTH 0x8A39
+#define GL_UNIFORM_BLOCK_INDEX 0x8A3A
+#define GL_UNIFORM_OFFSET 0x8A3B
+#define GL_UNIFORM_ARRAY_STRIDE 0x8A3C
+#define GL_UNIFORM_MATRIX_STRIDE 0x8A3D
+#define GL_UNIFORM_IS_ROW_MAJOR 0x8A3E
+#define GL_UNIFORM_BLOCK_BINDING 0x8A3F
+#define GL_UNIFORM_BLOCK_DATA_SIZE 0x8A40
+#define GL_UNIFORM_BLOCK_NAME_LENGTH 0x8A41
+#define GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS 0x8A42
+#define GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES 0x8A43
+#define GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER 0x8A44
+#define GL_UNIFORM_BLOCK_REFERENCED_BY_GEOMETRY_SHADER 0x8A45
+#define GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER 0x8A46
+#define GL_INVALID_INDEX 0xFFFFFFFFu
+#endif
+extern void (GLAPIENTRY *qglGetUniformIndices)(GLuint program, GLsizei uniformCount, const char** uniformNames, GLuint* uniformIndices);
+extern void (GLAPIENTRY *qglGetActiveUniformsiv)(GLuint program, GLsizei uniformCount, const GLuint* uniformIndices, GLenum pname, GLint* params);
+extern void (GLAPIENTRY *qglGetActiveUniformName)(GLuint program, GLuint uniformIndex, GLsizei bufSize, GLsizei* length, char* uniformName);
+extern GLuint (GLAPIENTRY *qglGetUniformBlockIndex)(GLuint program, const char* uniformBlockName);
+extern void (GLAPIENTRY *qglGetActiveUniformBlockiv)(GLuint program, GLuint uniformBlockIndex, GLenum pname, GLint* params);
+extern void (GLAPIENTRY *qglGetActiveUniformBlockName)(GLuint program, GLuint uniformBlockIndex, GLsizei bufSize, GLsizei* length, char* uniformBlockName);
+extern void (GLAPIENTRY *qglBindBufferRange)(GLenum target, GLuint index, GLuint buffer, GLintptrARB offset, GLsizeiptrARB size);
+extern void (GLAPIENTRY *qglBindBufferBase)(GLenum target, GLuint index, GLuint buffer);
+extern void (GLAPIENTRY *qglGetIntegeri_v)(GLenum target, GLuint index, GLint* data);
+extern void (GLAPIENTRY *qglUniformBlockBinding)(GLuint program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
+