XXX - Not complete yet!!! Name SGIX_blend_cadd Name Strings GL_SGIX_blend_cadd Version $Date: 1998/04/10 21:45:37 $ $Revision: 1.2 $ Number 150 Dependencies EXT_blend_minmax affects the definition of this extension SGIX_COMPLEX or SGIX_REAL pixel formats is required SGIX_FBConfig is required SGIX_cbuffer is required Overview An additional blending equation is specified using the interface defined by EXT_blend_minmax. This equation generates the addition of two complex input sources. Adding two complex images is useful for image and signal processing applications. New Procedures and Functions None New Tokens Accepted by the parameter of BlendEquationEXT: FUNC_COMPLEX_ADD_EXT 0x601C Additions to Chapter 2 of the GL Specification (OpenGL Operation) None Additions to Chapter 3 of the GL Specification (Rasterization) None Additions to Chapter 4 of the GL Specification (Per-Fragment Operations and the Framebuffer) An additional blending equation is defined. If BlendEquationEXT is called with set to FUNC_COMPLEX_ADD_EXT, the blending equation becomes C_real' = Cs_real + Cd_real C_imaginary' = Cs_imaginary + Cd_imaginary where Cs_real and Cs_imaginary are the source real and imaginary components and Cd_real and Cd_imaginary are the destination components. The resulting image will also be composed of real (C_real') and imaginary (C_imaginary') components. In all cases the blending equation is evaluated separately for each color component. Additions to Chapter 5 of the GL Specification (Special Functions) None Additions to Chapter 6 of the GL Specification (State and State Requests) None Additions to the GLX Specification None GLX Protocol None Dependencies on EXT_blend_minmax If this extension is supported, but EXT_blend_minmax is not, then this extension effectively defines the procedure BlendEquationEXT, its parameter FUNC_ADD_EXT, and the query target BLEND_EQUATION_EXT, as described in EXT_blend_minmax. It is therefore as though EXT_blend_minmax were also supported, except that equations MIN_EXT and MAX_EXT are not supported. Errors INVALID_ENUM is generated by BlendEquationEXT if its single parameter is not FUNC_ADD_EXT, MIN_EXT, MAX_EXT, FUNC_SUBTRACT_EXT, FUNC_REVERSE_SUBTRACT_EXT, FUNC_COMPLEX_MULTIPLY_EXT, FUNC_COMPLEX_ADD_EXT, FUNC_COMPLEX_PHASE_EXT or FUNC_COMPLEX_MAGNITUDE_EXT. INVALID_OPERATION is generated if BlendEquationEXT is executed with parameter FUNC_COMPLEX_MULTIPLY_EXT or FUNC_COMPLEX_ADD_EXT and the destination buffer is not an SGIX_cbuffer. INVALID_OPERATION is generated if BlendEquationEXT is executed between the execution of Begin and the corresponding execution to End. New State Get Value Get Command Type Initial Value Attribute --------- ----------- ---- ------------- --------- BLEND_EQUATION_EXT GetIntegerv ?? FUNC_ADD_EXT color-buffer New Implementation Dependent State None