Series Reviewed-by: Jordan Justen <jordan.l.jus...@intel.com>
On 2014-09-30 11:40:55, Anuj Phogat wrote:
> 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.pho...@gmail.com>
> ---
> src/mesa/main/mtypes.h | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
>
> diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
> index 0d50be8..258531b 100644
> --- a/src/mesa/main/mtypes.h
> +++ b/src/mesa/main/mtypes.h
> @@ -3608,6 +3608,38 @@ 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;
> --
> 1.9.3
>
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