| Name |
| |
| NV_conservative_raster_dilate |
| |
| Name Strings |
| |
| GL_NV_conservative_raster_dilate |
| |
| Contact |
| |
| Kedarnath Thangudu, NVIDIA Corporation (kthangudu 'at' nvidia.com) |
| |
| Contributors |
| |
| Chris Wyman, NVIDIA Corporation (cwyman 'at' nvidia.com) |
| Aaron Lefohn, NVIDIA Corporation (alefohn 'at' nvidia.com) |
| Mark Kilgard, NVIDIA Corporation (mkilgard 'at' nvidia.com) |
| Eric Werness, NVIDIA Corporation (ewerness 'at' nvidia.com) |
| |
| Status |
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| Shipping in Nvidia release 352.XX drivers and up. |
| |
| Version |
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| Last Modified Date: September 10, 2015 |
| Revision: 2 |
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| Number |
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| OpenGL Extension #480 |
| |
| Dependencies |
| |
| This extension is written against the NV_conservative_raster extension as |
| applied to OpenGL 4.3 specification (Compatibility Profile) but may be |
| used with the Core profile or OpenGL ES 2.0 or later. |
| |
| Overview |
| |
| This extension extends the conservative rasterization functionality |
| provided by NV_conservative_raster. It provides a new control to generate |
| an "over-conservative" rasterization by dilating primitives prior to |
| rasterization. |
| |
| When using conservative raster to bin geometry, this extension provides a |
| programmable overlap region between adjacent primitives. Regular |
| rasterization bins triangles with a shared edge uniquely into pixels. |
| Conservative raster has a one-pixel overlap along the shared edge. Using |
| a half-pixel raster dilation, this overlap region increases to two pixels. |
| |
| New Procedures and Functions |
| |
| void ConservativeRasterParameterfNV(enum pname, float value); |
| |
| New Tokens |
| |
| Accepted by the <pname> parameter of ConservativeRasterParameterfNV: |
| CONSERVATIVE_RASTER_DILATE_NV 0x9379 |
| |
| Accepted by the <pname> parameter of GetBooleanv, GetIntegerv, |
| GetInteger64v, GetFloatv, and GetDoublev: |
| |
| CONSERVATIVE_RASTER_DILATE_NV 0x9379 |
| CONSERVATIVE_RASTER_DILATE_RANGE_NV 0x937A |
| CONSERVATIVE_RASTER_DILATE_GRANULARITY_NV 0x937B |
| |
| Additions to Chapter 14 of the OpenGL 4.3 (Compatibility Profile) Specification |
| (Fixed-Function Primitive Assembly and Rasterization) |
| |
| Add the following paragraph to the end of the new subsection 14.6.X |
| "Conservative Rasterization" added by NV_conservative_raster |
| |
| When CONSERVATIVE_RASTERIZATION_NV is enabled, an "over conservative" |
| rasterization of primitives may be achieved by dilating points, lines, or |
| polygons in screen space prior to rasterization. The amount of dilation |
| may be specified by the following command |
| |
| void ConservativeRasterParameterfNV(enum pname, float value); |
| |
| with the <pname> set to CONSERVATIVE_RASTER_DILATE_NV. The <value> |
| specifies the amount of dilation as a fraction of the pixel size. Not all |
| fractional values are supported. If the requested value is greater than |
| the maximum supported value, the maximum supported value is used. If any |
| other supported value is requested, the nearest supported value which |
| is greater than the requested value is used. Only a dilation value of 0 |
| pixels is guaranteed to be supported; others depend on the implementation. |
| Calling Get with CONSERVATIVE_RASTER_DILATE_RANGE_NV returns |
| two floating point values representing minimum and maximum supported |
| dilation values. Calling Get with CONSERVATIVE_RASTER_DILATE_- |
| GRANULARITY_NV returns a single floating point value representing the |
| value difference between consecutive supported values within the range. |
| |
| Additions to the AGL/GLX/WGL Specifications |
| |
| None. |
| |
| GLX Protocol |
| |
| None. |
| |
| Modifications to the OpenGL Shading Language Specification, Version 4.30 |
| |
| None. |
| |
| Errors |
| |
| If ConservativeRasterParameteriNV is called and <pname> is not |
| CONSERVATIVE_RASTER_DILATE_NV the error INVALID_ENUM is generated. |
| |
| If ConservativeRasterParameteriNV is called with <pname> set to |
| CONSERVATIVE_RASTER_DILATE_NV the error INVALID_VALUE is generated if |
| <value> is less than 0. |
| |
| New Implementation Dependent State |
| Minimum |
| Get Value Type Get Command Value Description Sec. |
| --------- ------- ----------- ------- ------------------------------ ------ |
| CONSERVATIVE_RASTER_DILATE_- 2 x R+ GetFloatv 0, 0.75 Min and Max dilation values 14.6.X |
| RANGE_NV supported |
| CONSERVATIVE_RASTER_DILATE_- R+ GetFloatv 0 Difference between consecutive 14.6.X |
| GRANULARITY_NV supported values in the range |
| |
| New State |
| |
| Get Value Get Command Type Initial Value Description Sec. Attribute |
| --------- ----------- ---- ------------- ----------- ---- --------- |
| CONSERVATIVE_RASTER_DILATE_NV GetFloatv R+ 0 Dilate primitives when 14.6.X - |
| conservative rasterization |
| is enabled. |
| |
| NVIDIA Implementation Details |
| |
| NVIDIA's GeForce 9xx and Quadro Mxxxx series of GPUs (GM20x) and Tegra X1 |
| support this extension with a granularity of 0.25 and a range of [0, 0.75]. |
| |
| Issues |
| |
| None. |
| |
| Revision History |
| |
| Revision 2 |
| - Fix the descriptions for the <pname> parameters. |
| - Fix typos and wordings. |
| |
| Revision 1 |
| - Internal revisions. |
