| GL_EXT_texture_env_add |
- Name
- Name Strings
- Contact
- Status
- Version
- Number
- Dependencies
- Overview
- New Procedures and Functions
- New Tokens
- Additions to Chapter 2 of the GL Specification (OpenGL Operation)
- Additions to Chapter 3 of the GL Specification (Rasterization)
- Additions to Chapter 4 of the GL Specification (Per-Fragment Operations and the Framebuffer)
- Additions to Chapter 5 of the GL Specification (Special Functions)
- Additions to Chapter 6 of the GL Specification (State and State Requests)
- Additions to the GLX / WGL / AGL Specifications
- GLX Protocol
- Errors
- New State
- New Implementation Dependent State
   Name |
EXT_texture_env_add
| Name Strings |
GL_EXT_texture_env_add
| Contact |
Michael Gold, NVIDIA (gold 'at' nvidia.com)
Tom Frisinger, ATI (tfrisinger 'at' atitech.com)
| Status |
Shipping (version 1.6)
| Version |
$Date: 1999/03/22 17:28:00 $ $Revision: 1.1 $
| Number |
185
| Dependencies |
None
| Overview |
New texture environment function ADD is supported with the following
equation:
Cv = min(1, Cf + Ct)
New function may be specified by calling TexEnv with ADD token.
| New Procedures and Functions |
None
| New Tokens |
Accepted by the <params> parameter of TexEnvf, TexEnvi, TexEnvfv, and
TexEnvfi when the <pname> parameter value is GL_TEXTURE_ENV_MODE
ADD
| Additions to Chapter 2 of the GL Specification (OpenGL Operation) |
None
| Additions to Chapter 3 of the GL Specification (Rasterization) |
Texture Environment
-------------------
Base Texture Format REPLACE MODULATE BLEND DECAL ADD
------------------- ------- -------- ----- ----- ---
ALPHA ... ... ... ... Rv = Rf
... ... ... ... Gv = Gf
... ... ... ... Bv = Bf
... ... ... ... Av = AfAt
LUMINANCE ... ... ... ... Rv = min(1, Rf+Lt)
... ... ... ... Gv = min(1, Gf+Lt)
... ... ... ... Bv = min(1, Bf+Lt)
... ... ... ... Av = Af
LUMINANCE_ALPHA ... ... ... ... Rv = min(1, Rf+Lt)
... ... ... ... Gv = min(1, Gf+Lt)
... ... ... ... Bv = min(1, Bf+Lt)
... ... ... ... Av = AfAt
INTENSITY ... ... ... ... Rv = min(1, Rf+It)
... ... ... ... Gv = min(1, Gf+It)
... ... ... ... Bv = min(1, Bf+It)
... ... ... ... Av = min(1, Af+It)
RGB ... ... ... ... Rv = min(1, Rf+Rt)
... ... ... ... Gv = min(1, Gf+Gt)
... ... ... ... Bv = min(1, Bf+Bt)
... ... ... ... Av = Af
RGBA ... ... ... ... Rv = min(1, Rf+Rt)
... ... ... ... Gv = min(1, Gf+Gt)
... ... ... ... Bv = min(1, Bf+Bt)
... ... ... ... Av = AfAt
Table 3.11: Texture functions.
| Additions to Chapter 4 of the GL Specification (Per-Fragment Operations and the Framebuffer) |
None
| 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 / WGL / AGL Specifications |
None
| GLX Protocol |
None
| Errors |
None
| New State |
None
| New Implementation Dependent State |
None
None
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