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mesa: Add new variables in gl_context to store sample layout

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SampleMap{2,4,8}x variables are used in later patches to implement
EXT_framebuffer_multisample_blit_scaled extension.

V2: Use integer array instead of a string.
    Bump up the comment.

V3: Use uint8_t type array.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Anuj Phogat 2014-09-23 11:56:54 -07:00
parent 4f7916ab4f
commit 38cd40faab
1 changed files with 32 additions and 0 deletions
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32
src/mesa/main/mtypes.h
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@ -3606,6 +3606,38 @@ struct gl_constants
GLint MaxDepthTextureSamples;
GLint MaxIntegerSamples;
/**
* GL_EXT_texture_multisample_blit_scaled implementation assumes that
* samples are laid out in a rectangular grid roughly corresponding to
* sample locations within a pixel. Below SampleMap{2,4,8}x variables
* are used to map indices of rectangular grid to sample numbers within
* a pixel. This mapping of indices to sample numbers must be initialized
* by the driver for the target hardware. For example, if we have the 8X
* MSAA sample number layout (sample positions) for XYZ hardware:
*
* sample indices layout sample number layout
* --------- ---------
* | 0 | 1 | | a | b |
* --------- ---------
* | 2 | 3 | | c | d |
* --------- ---------
* | 4 | 5 | | e | f |
* --------- ---------
* | 6 | 7 | | g | h |
* --------- ---------
*
* Where a,b,c,d,e,f,g,h are integers between [0-7].
*
* Then, initialize the SampleMap8x variable for XYZ hardware as shown
* below:
* SampleMap8x = {a, b, c, d, e, f, g, h};
*
* Follow the logic for other sample counts.
*/
uint8_t SampleMap2x[2];
uint8_t SampleMap4x[4];
uint8_t SampleMap8x[8];
/** GL_ARB_shader_atomic_counters */
GLuint MaxAtomicBufferBindings;
GLuint MaxAtomicBufferSize;