This file contains fonction that should be used to correctly manage transparency in custom shaders. More...
Go to the source code of this file.
Defines | |
| #define | OIV_DEPTHPEELING_H |
Functions | |
| bool | OivDepthPeel (vec3 fragmentCoords) |
| void | OivDepthPeelingOutputColor (vec4 color) |
| void | OivDepthPeelingOutputColor (vec4 color, vec3 coords) |
This file contains fonction that should be used to correctly manage transparency in custom shaders.
To properly handle transparency, your fragment shader should contains the following function calls:
These methods are accessible by including the <Inventor/oivDepthPeeling_frag.h> header in your shader:
Ex:
void main() { if ( OivDepthPeel(gl_FragCoord.xyz) ) { Vec4 color = vec4(1, 0, 0, 0.5); OivDepthPeelingOutputColor(color); } }
Definition in file oivDepthPeeling_frag.h.
| #define OIV_DEPTHPEELING_H |
| bool OivDepthPeel | ( | vec3 | fragmentCoords | ) |
This method peels the current fragment.
If the fragment must be ignored the method does the discard. The fragments coords must be in screen space (gl_FragCoord.xyz should always be used)
Returns true if the fragment should be shaded.
| void OivDepthPeelingOutputColor | ( | vec4 | color, | |
| vec3 | coords | |||
| ) |
By default the depth generated by the rasterizer (gl_FragCoord.z) is used but some algorithms may modify the depth in the fragment shader.
In theses case gl_FragCoord.z is not valid and thus the user-defined depth coordinate must be explicitly specified
| void OivDepthPeelingOutputColor | ( | vec4 | color | ) |
When depth peeling is enabled OivDepthPeelingOutputColor must be called instead of using the gl_FragData[0] since some depth peeling techniques use MRTs (multiple render targets) or premultiply the color by the alpha value (on-the-fly blending for example).