Contents

• Dependencies
• Overview
• New Procedures and Functions
• New Tokens
• Errors
• New State
• New Implementation Dependent State

Dependencies

None

Overview

Blending capability is extended by defining a function that allows independent setting of the RGB and alpha blend factors for blend operations that require source and destination blend factors. It is not always desired that the blending used for RGB is also applied to alpha.

New Procedures and Functions

void BlendFuncSeparateEXT(enum sfactorRGB, enum dfactorRGB, enum sfactorAlpha, enum dfactorAlpha);

New Tokens

Accepted by the

<pname>

parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev:

|BLEND_DST_RGB_EXT | 0x80C8| |:----------------------|:-------| |BLEND_SRC_RGB_EXT |0x80C9 | |BLEND_DST_ALPHA_EXT |0x80CA | |BLEND_SRC_ALPHA_EXT |0x80CB |

Errors

GL_INVALID_ENUM is generated if either sfactorRGB, dfactorRGB, sfactorAlpha, or dfactorAlpha is not an accepted value.

GL_INVALID_OPERATION is generated if glBlendFunc is executed between the execution of glBegin and the corresponding execution of glEnd.

New State

The get values BLEND_SRC and BLEND_DST return the RGB source and destination factor, respectively.

| Get Value | Get Command | Type | Initial Value | |:--------------|:----------------|:---------|:------------------| |BLEND_SRC_RGB_EXT | GetFloatv | Z | ONE | |BLEND_DST_RGB_EXT | GetFloatv | Z | ZERO | |BLEND_SRC_ALPHA_EXT | GetFloatv | Z | ONE | |BLEND_DST_ALPHA_EXT | GetFloatv | Z | ZERO |

New Implementation Dependent State

None