On Fri, Jun 27, 2008 at 12:57 PM, José Fonseca
<[EMAIL PROTECTED]> wrote:
> In order to properly represent the compressed textures and (yuv formats
> to some extent) it is necessary to abandon the chars-per-pixels concept
> in gallium, and use instead the concept of pixel blocks (in p_format.h):
>
> /**
> * Describe accurately the pixel format.
> *
> * The chars-per-pixel concept falls apart with compressed and yuv images,
> where
> * more than one pixel are coded in a single data block. This structure
> * describes that block.
> *
> * Simple pixel formats are effectively a 1x1xcpp block.
> */
> struct pipe_format_block
> {
> /** Block size in bytes */
> unsigned size;
>
> /** Block width in pixels */
> unsigned width;
>
> /** Block height in pixels */
> unsigned height;
> };
>
> /**
> * Describe pixel format's block.
> *
> * @sa http://msdn2.microsoft.com/en-us/library/ms796147.aspx
> */
> static INLINE void
> pf_get_block(enum pipe_format format, struct pipe_format_block *block)
> {
> switch(format) {
> case PIPE_FORMAT_DXT1_RGBA:
> case PIPE_FORMAT_DXT1_RGB:
> block->size = 8;
> block->width = 4;
> block->height = 4;
> break;
> case PIPE_FORMAT_DXT3_RGBA:
> case PIPE_FORMAT_DXT5_RGBA:
> block->size = 16;
> block->width = 4;
> block->height = 4;
> break;
> case PIPE_FORMAT_YCBCR:
> case PIPE_FORMAT_YCBCR_REV:
> block->size = 4; /* 2*cpp */
> block->width = 2;
> block->height = 1;
> break;
> default:
> block->size = pf_get_size(format);
> block->width = 1;
> block->height = 1;
> break;
> }
> }
>
> static INLINE unsigned
> pf_get_nblocksx(const struct pipe_format_block *block, unsigned x)
> {
> return (x + block->width - 1)/block->width;
> }
>
> static INLINE unsigned
> pf_get_nblocksy(const struct pipe_format_block *block, unsigned y)
> {
> return (y + block->height - 1)/block->height;
> }
>
>
> Pipe texture will become:
>
> --- a/src/gallium/include/pipe/p_state.h
> +++ b/src/gallium/include/pipe/p_state.h
> @@ -303,7 +303,10 @@ struct pipe_texture
> unsigned height[PIPE_MAX_TEXTURE_LEVELS];
> unsigned depth[PIPE_MAX_TEXTURE_LEVELS];
>
> - unsigned cpp:8;
> + struct pipe_format_block block;
> + unsigned nblocksx[PIPE_MAX_TEXTURE_LEVELS];
> + unsigned nblocksy[PIPE_MAX_TEXTURE_LEVELS];
> +
> unsigned last_level:8; /**< Index of last mipmap level present/defined
> */
> unsigned compressed:1;
>
>
> Also, with chars per pixel gone, pitch is better be specified in bytes,
> rather than pixels. To make sure that nothing gets forgotten I'm going
> to rename all pipe_texture and pipe_surface "pitch" members to "stride",
> so that if somewhere is forgotten one gets a compiler error:
>
> --- a/src/gallium/include/pipe/p_state.h
> +++ b/src/gallium/include/pipe/p_state.h
> @@ -267,10 +267,12 @@ struct pipe_surface
> enum pipe_format format; /**< PIPE_FORMAT_x */
> unsigned status; /**< PIPE_SURFACE_STATUS_x */
> unsigned clear_value; /**< XXX may be temporary */
> - unsigned cpp; /**< bytes per pixel */
> unsigned width;
> unsigned height;
> - unsigned pitch; /**< in pixels */
> + struct pipe_format_block block;
> + unsigned nblocksx;
> + unsigned nblocksy;
> + unsigned stride; /**< in bytes */
> unsigned layout; /**< PIPE_SURFACE_LAYOUT_x */
> unsigned offset; /**< offset from start of buffer, in bytes */
> unsigned refcount;
Looks good.
I have fixed the problems in the i915simple driver and dri/intel
winsys that where remaining. So that works now.
I seem to have lost single buffer windows somewhere along the line. I
donnu if this is related to these changes (probably not), but I don't
have time to debug. Will fix it next week.
Cheers Jakob.
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