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Diffstat (limited to 'chromium/third_party/angle/extensions/EXT_blend_minmax.txt')
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diff --git a/chromium/third_party/angle/extensions/EXT_blend_minmax.txt b/chromium/third_party/angle/extensions/EXT_blend_minmax.txt new file mode 100644 index 00000000000..522ac202233 --- /dev/null +++ b/chromium/third_party/angle/extensions/EXT_blend_minmax.txt @@ -0,0 +1,164 @@ +Name + + EXT_blend_minmax + +Name Strings + + GL_EXT_blend_minmax + +Version + + Last Modified Date: September 17, 2009 + Version: 1.5 + +Number + + OpenGL Extension #37 + OpenGL ES Extension #65 + +Dependencies + + There is an interaction with OpenGL ES. + +Overview + + Blending capability is extended by respecifying the entire blend + equation. While this document defines only two new equations, the + BlendEquationEXT procedure that it defines will be used by subsequent + extensions to define additional blending equations. + + The two new equations defined by this extension produce the minimum + (or maximum) color components of the source and destination colors. + Taking the maximum is useful for applications such as maximum projection + in medical imaging. + +Issues + + * I've prefixed the ADD token with FUNC, to indicate that the blend + equation includes the parameters specified by BlendFunc. (The min + and max equations don't.) Is this necessary? Is it too ugly? + Is there a better way to accomplish the same thing? + +New Procedures and Functions + + void BlendEquationEXT(enum mode); + +New Tokens + + Accepted by the <mode> parameter of BlendEquationEXT: + + FUNC_ADD_EXT 0x8006 + MIN_EXT 0x8007 + MAX_EXT 0x8008 + + Accepted by the <pname> parameter of GetBooleanv, GetIntegerv, + GetFloatv, and GetDoublev: + + BLEND_EQUATION_EXT 0x8009 + +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) + + The GL Specification defines a single blending equation. This + extension introduces a blend equation mode that is specified by calling + BlendEquationEXT with one of three enumerated values. The default + value FUNC_ADD_EXT specifies that the blending equation defined in + the GL Specification be used. This equation is + + C' = (Cs * S) + (Cd * D) + + / 1.0 C' > 1.0 + C = ( + \ C' C' <= 1.0 + + where Cs and Cd are the source and destination colors, and S and D are + as specified by BlendFunc. + + If BlendEquationEXT is called with <mode> set to MIN_EXT, the + blending equation becomes + + C = min (Cs, Cd) + + Finally, if BlendEquationEXT is called with <mode> set to MAX_EXT, the + blending equation becomes + + C = max (Cs, Cd) + + 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 + + A new GL rendering command is added. The following command is sent to the + server as part of a glXRender request: + + BlendEquationEXT + 2 8 rendering command length + 2 4097 rendering command opcode + 4 ENUM mode + +Dependencies on OpenGL ES + + If the GL is OpenGL ES, only the new MIN_EXT and MAX_EXT blend equations + are introduced by this extension. BlendEquationOES, FUNC_ADD_OES, and + BLEND_EQUATION_OES are introduced by the OES_blend_subtract extension, + which is required for this extension to operate. Alternatively, + OpenGL ES 2.0 is required, which introduces BlendEquation, FUNC_ADD, and + BLEND_EQUATION without the suffixes. + + MIN_EXT and MAX_EXT should be added to Table 4.blendeq described in the + OES_blend_subtract extension specification, and Table 4.1 of the OpenGL + ES 2.0 specification. + + Mentions of GetDoublev, Begin/End, and GLX in this extension specification + can be ignored for OpenGL ES. Also, BlendEquationEXT and FUNC_ADD_EXT + instead have the OES suffix courtesy of OES_blend_subtract, or no suffix + courtesy of core OpenGL ES 2.0. + +Errors + + INVALID_ENUM is generated by BlendEquationEXT if its single parameter + is not FUNC_ADD_EXT, MIN_EXT, or MAX_EXT. + + 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 Z3 FUNC_ADD_EXT color-buffer + +New Implementation Dependent State + + None + +Revision History + + Version 1.5, September 17, 2009 (Jon Leech) - + Merge into OpenGL Registry version of the extension and assign + OpenGL ES extension number. + Version 1.4, May 19, 2009 (Benj Lipchak) - + Adapted for OpenGL ES. + Version 1.3, May 31, 1995 - + Last SGI revision. |