| Name |
| |
| EXT_blend_logic_op |
| |
| Name Strings |
| |
| GL_EXT_blend_logic_op |
| |
| Version |
| |
| $Date: 1995/03/31 04:40:24 $ $Revision: 1.4 $ |
| |
| Number |
| |
| 39 |
| |
| Dependencies |
| |
| EXT_blend_minmax affects the definition of this extension |
| |
| Overview |
| |
| A single additional blending equation is specified using the interface |
| defined by EXT_blend_minmax. This equation is a simple logical |
| combination of the source and destination colors, where the specific |
| logical operation is as specified by LogicOp. While only the XOR |
| operation may find wide application, the generality of full logical |
| operations is allowed. |
| |
| New Procedures and Functions |
| |
| None |
| |
| New Tokens |
| |
| None |
| |
| 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) |
| |
| A single additional blending equation is defined. If BlendEquationEXT |
| is called with <mode> set to LOGIC_OP, the blending equation becomes |
| |
| C = Cs OP Cd |
| |
| where Cs and Cd are the source and destination colors, and OP is the |
| logic operation as specified by LogicOp. |
| |
| The value of boolean parameter LOGIC_OP (specified by Enable and |
| Disable, and queried with IsEnabled) has no affect on blending, even |
| when the blend equation is specified as LOGIC_OP. |
| |
| 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 adds 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, or LOGIC_OP. |
| |
| 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 Z6 FUNC_ADD_EXT color-buffer |
| |
| New Implementation Dependent State |
| |
| None |
