GL_EXT_histogram http://www.opengl.org/registry/specs/EXT/histogram.txt GL_EXT_histogram GL_HISTOGRAM_EXT 0x8024 GL_PROXY_HISTOGRAM_EXT 0x8025 GL_HISTOGRAM_WIDTH_EXT 0x8026 GL_HISTOGRAM_FORMAT_EXT 0x8027 GL_HISTOGRAM_RED_SIZE_EXT 0x8028 GL_HISTOGRAM_GREEN_SIZE_EXT 0x8029 GL_HISTOGRAM_BLUE_SIZE_EXT 0x802A GL_HISTOGRAM_ALPHA_SIZE_EXT 0x802B GL_HISTOGRAM_LUMINANCE_SIZE_EXT 0x802C GL_HISTOGRAM_SINK_EXT 0x802D GL_MINMAX_EXT 0x802E GL_MINMAX_FORMAT_EXT 0x802F GL_MINMAX_SINK_EXT 0x8030 void glGetHistogramEXT (GLenum target, GLboolean reset, GLenum format, GLenum type, void *values) void glGetHistogramParameterfvEXT (GLenum target, GLenum pname, GLfloat* params) void glGetHistogramParameterivEXT (GLenum target, GLenum pname, GLint* params) void glGetMinmaxEXT (GLenum target, GLboolean reset, GLenum format, GLenum type, void *values) void glGetMinmaxParameterfvEXT (GLenum target, GLenum pname, GLfloat* params) void glGetMinmaxParameterivEXT (GLenum target, GLenum pname, GLint* params) void glHistogramEXT (GLenum target, GLsizei width, GLenum internalformat, GLboolean sink) void glMinmaxEXT (GLenum target, GLenum internalformat, GLboolean sink) void glResetHistogramEXT (GLenum target) void glResetMinmaxEXT (GLenum target)