[Mesa-dev] [PATCHv2 08/14] i965: Define and initialize image parameter structure.
Francisco Jerez
currojerez at riseup.net
Thu Aug 6 07:19:49 PDT 2015
Francisco Jerez <currojerez at riseup.net> writes:
> "Pohjolainen, Topi" <topi.pohjolainen at intel.com> writes:
>
>> On Wed, Aug 05, 2015 at 12:11:02PM +0300, Pohjolainen, Topi wrote:
>>> On Mon, Jul 20, 2015 at 07:17:48PM +0300, Francisco Jerez wrote:
>>> > This will be used to pass image meta-data to the shader when we cannot
>>> > use typed surface reads and writes. All entries except surface_idx
>>> > and size are otherwise unused and will get eliminated by the uniform
>>> > packing pass. size will be used for bounds checking with some image
>>> > formats and will be useful for ARB_shader_image_size too. surface_idx
>>> > is always used.
>>> >
>>> > v2: Add CS support. Move the image_params array back to
>>> > brw_stage_prog_data.
>>> > ---
>>> > I'm resending this (and also patches 9 and 10) because I had to make
>>> > some rather intrusive changes during one of my last rebases -- The
>>> > image_param array is now part of brw_stage_prog_data again instead of
>>> > brw_stage_state (ironically as it was in my very first submission of
>>> > these patches) because the compiler no longer has access to
>>> > brw_stage_state since the brw_context pointer was removed from the
>>> > visitors.
>>> >
>>> > src/mesa/drivers/dri/i965/brw_context.h | 54 ++++++++++++++++
>>> > src/mesa/drivers/dri/i965/brw_cs.cpp | 3 +
>>> > src/mesa/drivers/dri/i965/brw_gs.c | 3 +
>>> > src/mesa/drivers/dri/i965/brw_vs.c | 5 +-
>>> > src/mesa/drivers/dri/i965/brw_wm.c | 4 ++
>>> > src/mesa/drivers/dri/i965/brw_wm_surface_state.c | 82 ++++++++++++++++++++++++
>>> > 6 files changed, 150 insertions(+), 1 deletion(-)
>>> >
>>> > diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
>>> > index e16ad10..9ebad5b 100644
>>> > --- a/src/mesa/drivers/dri/i965/brw_context.h
>>> > +++ b/src/mesa/drivers/dri/i965/brw_context.h
>>> > @@ -361,6 +361,7 @@ struct brw_stage_prog_data {
>>> >
>>> > GLuint nr_params; /**< number of float params/constants */
>>> > GLuint nr_pull_params;
>>> > + unsigned nr_image_params;
>>> >
>>> > unsigned curb_read_length;
>>> > unsigned total_scratch;
>>> > @@ -381,6 +382,59 @@ struct brw_stage_prog_data {
>>> > */
>>> > const gl_constant_value **param;
>>> > const gl_constant_value **pull_param;
>>> > +
>>> > + /**
>>> > + * Image metadata passed to the shader as uniforms. This is deliberately
>>> > + * ignored by brw_stage_prog_data_compare() because its contents don't have
>>> > + * any influence on program compilation.
>>> > + */
>>> > + struct brw_image_param *image_param;
>>> > +};
>>> > +
>>> > +/*
>>> > + * Image metadata structure as laid out in the shader parameter
>>> > + * buffer. Entries have to be 16B-aligned for the vec4 back-end to be
>>> > + * able to use them. That's okay because the padding and any unused
>>> > + * entries [most of them except when we're doing untyped surface
>>> > + * access] will be removed by the uniform packing pass.
>>> > + */
>>> > +#define BRW_IMAGE_PARAM_SURFACE_IDX_OFFSET 0
>>> > +#define BRW_IMAGE_PARAM_OFFSET_OFFSET 4
>>> > +#define BRW_IMAGE_PARAM_SIZE_OFFSET 8
>>> > +#define BRW_IMAGE_PARAM_STRIDE_OFFSET 12
>>> > +#define BRW_IMAGE_PARAM_TILING_OFFSET 16
>>> > +#define BRW_IMAGE_PARAM_SWIZZLING_OFFSET 20
>>> > +#define BRW_IMAGE_PARAM_SIZE 24
>>> > +
>>> > +struct brw_image_param {
>>> > + /** Surface binding table index. */
>>> > + uint32_t surface_idx;
>>> > +
>>> > + /** Surface X, Y and Z dimensions. */
>>> > + uint32_t size[3];
>>>
>>> Like I mentioned in one of the subsequent patches, it would clearer if
>>> "size" would follow "offset". That way it matches the order of
>>> BRW_IMAGE_PARAM_*_OFFSET defines and later on the layout in the uniform
>>> buffer object.
>>>
>>> > +
>>> > + /** Offset applied to the X and Y surface coordinates. */
>>> > + uint32_t offset[2];
>>> > +
>>> > + /** X-stride in bytes, Y-stride in bytes, horizontal slice stride in
>>> > + * pixels, vertical slice stride in pixels.
>>> > + */
>>> > + uint32_t stride[4];
>>> > +
>>> > + /** Log2 of the tiling modulus in the X, Y and Z dimension. */
>>> > + uint32_t tiling[3];
>>> > +
>>> > + /**
>>> > + * Right shift to apply for bit 6 address swizzling. Two different
>>> > + * swizzles can be specified and will be applied one after the other. The
>>> > + * resulting address will be:
>>> > + *
>>> > + * addr' = addr ^ ((1 << 6) & ((addr >> swizzling[0]) ^
>>> > + * (addr >> swizzling[1])))
>>> > + *
>>> > + * Use \c 0xff if any of the swizzles is not required.
>>> > + */
>>> > + uint32_t swizzling[2];
>>> > };
>>> >
>>> > /* Data about a particular attempt to compile a program. Note that
>>> > diff --git a/src/mesa/drivers/dri/i965/brw_cs.cpp b/src/mesa/drivers/dri/i965/brw_cs.cpp
>>> > index d61bba0..144aa27 100644
>>> > --- a/src/mesa/drivers/dri/i965/brw_cs.cpp
>>> > +++ b/src/mesa/drivers/dri/i965/brw_cs.cpp
>>> > @@ -190,7 +190,10 @@ brw_codegen_cs_prog(struct brw_context *brw,
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > prog_data.base.pull_param =
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > + prog_data.base.image_param =
>>> > + rzalloc_array(NULL, struct brw_image_param, cs->NumImages);
>>> > prog_data.base.nr_params = param_count;
>>> > + prog_data.base.nr_image_params = cs->NumImages;
>>> >
>>> > program = brw_cs_emit(brw, mem_ctx, key, &prog_data,
>>> > &cp->program, prog, &program_size);
>>> > diff --git a/src/mesa/drivers/dri/i965/brw_gs.c b/src/mesa/drivers/dri/i965/brw_gs.c
>>> > index 9c59c8a..d1a955a 100644
>>> > --- a/src/mesa/drivers/dri/i965/brw_gs.c
>>> > +++ b/src/mesa/drivers/dri/i965/brw_gs.c
>>> > @@ -69,7 +69,10 @@ brw_codegen_gs_prog(struct brw_context *brw,
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > c.prog_data.base.base.pull_param =
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > + c.prog_data.base.base.image_param =
>>> > + rzalloc_array(NULL, struct brw_image_param, gs->NumImages);
>>> > c.prog_data.base.base.nr_params = param_count;
>>> > + c.prog_data.base.base.nr_image_params = gs->NumImages;
>>> >
>>> > if (brw->gen >= 7) {
>>> > if (gp->program.OutputType == GL_POINTS) {
>>> > diff --git a/src/mesa/drivers/dri/i965/brw_vs.c b/src/mesa/drivers/dri/i965/brw_vs.c
>>> > index 2b9b005..20bc7a9 100644
>>> > --- a/src/mesa/drivers/dri/i965/brw_vs.c
>>> > +++ b/src/mesa/drivers/dri/i965/brw_vs.c
>>> > @@ -122,7 +122,7 @@ brw_codegen_vs_prog(struct brw_context *brw,
>>> > * conservative here.
>>> > */
>>> > param_count = vs->num_uniform_components * 4;
>>> > -
>>> > + stage_prog_data->nr_image_params = vs->NumImages;
>>> > } else {
>>> > param_count = vp->program.Base.Parameters->NumParameters * 4;
>>> > }
>>> > @@ -135,6 +135,9 @@ brw_codegen_vs_prog(struct brw_context *brw,
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > stage_prog_data->pull_param =
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > + stage_prog_data->image_param =
>>> > + rzalloc_array(NULL, struct brw_image_param,
>>> > + stage_prog_data->nr_image_params);
>>> > stage_prog_data->nr_params = param_count;
>>> >
>>> > GLbitfield64 outputs_written = vp->program.Base.OutputsWritten;
>>> > diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
>>> > index b590b17..e0e0bb7 100644
>>> > --- a/src/mesa/drivers/dri/i965/brw_wm.c
>>> > +++ b/src/mesa/drivers/dri/i965/brw_wm.c
>>> > @@ -196,6 +196,7 @@ brw_codegen_wm_prog(struct brw_context *brw,
>>> > int param_count;
>>> > if (fs) {
>>> > param_count = fs->num_uniform_components;
>>> > + prog_data.base.nr_image_params = fs->NumImages;
>>> > } else {
>>> > param_count = fp->program.Base.Parameters->NumParameters * 4;
>>> > }
>>> > @@ -205,6 +206,9 @@ brw_codegen_wm_prog(struct brw_context *brw,
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > prog_data.base.pull_param =
>>> > rzalloc_array(NULL, const gl_constant_value *, param_count);
>>> > + prog_data.base.image_param =
>>> > + rzalloc_array(NULL, struct brw_image_param,
>>> > + prog_data.base.nr_image_params);
>>> > prog_data.base.nr_params = param_count;
>>> >
>>> > prog_data.barycentric_interp_modes =
>>> > diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
>>> > index 33e045f..cc09c04 100644
>>> > --- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
>>> > +++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
>>> > @@ -1045,6 +1045,83 @@ get_image_format(struct brw_context *brw, mesa_format format, GLenum access)
>>> > }
>>> >
>>> > static void
>>> > +update_default_image_param(struct brw_context *brw,
>>> > + struct gl_image_unit *u,
>>> > + unsigned surface_idx,
>>> > + struct brw_image_param *param)
>>> > +{
>>> > + memset(param, 0, sizeof(*param));
>>> > + param->surface_idx = surface_idx;
>>> > + param->swizzling[0] = 0xff;
>>> > + param->swizzling[1] = 0xff;
>>> > +}
>>> > +
>>> > +static void
>>> > +update_buffer_image_param(struct brw_context *brw,
>>> > + struct gl_image_unit *u,
>>> > + unsigned surface_idx,
>>> > + struct brw_image_param *param)
>>> > +{
>>> > + struct gl_buffer_object *obj = u->TexObj->BufferObject;
>>> > +
>>> > + update_default_image_param(brw, u, surface_idx, param);
>>> > +
>>> > + param->size[0] = obj->Size / _mesa_get_format_bytes(u->_ActualFormat);
>>> > + param->stride[0] = _mesa_get_format_bytes(u->_ActualFormat);
>>> > +}
>>> > +
>>> > +static void
>>> > +update_texture_image_param(struct brw_context *brw,
>>> > + struct gl_image_unit *u,
>>> > + unsigned surface_idx,
>>> > + struct brw_image_param *param)
>>> > +{
>>> > + struct intel_mipmap_tree *mt = intel_texture_object(u->TexObj)->mt;
>>> > +
>>> > + update_default_image_param(brw, u, surface_idx, param);
>>> > +
>>> > + param->size[0] = minify(mt->logical_width0, u->Level);
>>> > + param->size[1] = minify(mt->logical_height0, u->Level);
>>> > + param->size[2] = (!u->Layered ? 1 :
>>> > + u->TexObj->Target == GL_TEXTURE_CUBE_MAP ? 6 :
>>> > + u->TexObj->Target == GL_TEXTURE_3D ?
>>> > + minify(mt->logical_depth0, u->Level) :
>>> > + mt->logical_depth0);
>>> > +
>>> > + intel_miptree_get_image_offset(mt, u->Level, u->Layer,
>>> > + ¶m->offset[0],
>>> > + ¶m->offset[1]);
>>> > +
>>> > + param->stride[0] = mt->cpp;
>>> > + param->stride[1] = mt->pitch / mt->cpp;
>>> > + param->stride[2] =
>>> > + brw_miptree_get_horizontal_slice_pitch(brw, mt, u->Level);
>>> > + param->stride[3] =
>>> > + brw_miptree_get_vertical_slice_pitch(brw, mt, u->Level);
>>> > +
>>> > + if (mt->tiling == I915_TILING_X) {
>>> > + param->tiling[0] = ffs(512 / mt->cpp) - 1;
>>> > + param->tiling[1] = 3;
>>>
>>> Would it be clearer to use ffs(8) - 1 here also? Or add a comment
>>>
>>> param->tiling[1] = 3; /* log2(8) */
>>>
>>> And the same further down for the vertical Y-tiling dimension.
>>>
>>> > +
>>> > + if (brw->has_swizzling) {
>>> > + param->swizzling[0] = 3;
>>> > + param->swizzling[1] = 4;
>>> > + }
>>> > + } else if (mt->tiling == I915_TILING_Y) {
>>> > + param->tiling[0] = ffs(16 / mt->cpp) - 1;
>>>
>>> Above you use the full tile width of 512 (in bytes) for X-tile, but here
>>> only 16 for Y-tile instead of the 128. I don't really understand this.
>>>
>>> > + param->tiling[1] = 5;
>>> > +
>>> > + if (brw->has_swizzling)
>>> > + param->swizzling[0] = 3;
>>> > + }
>>> > +
>>> > + if (u->TexObj->Target == GL_TEXTURE_3D)
>>> > + param->tiling[2] = u->Level;
>>> > + else
>>> > + param->tiling[2] = 0;
>>>
>>> Here you set the value directly to the z-dimension but in the documentation
>>> claims that all three tiling values are log2.
>>
>> And looking further emit_address_calculation() I now understand the
>> documentation - this is log2 of the number of slices in particular level.
>>
>> This patch is:
>>
>> Reviewed-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
>
> Thanks!
I've added a couple of comments more to this function for the case
someone asks himself the same questions in the future, and replaced the
ffs() calculations with equivalent calls to _mesa_logbase2 for clarity,
see [1].
[1] http://cgit.freedesktop.org/~currojerez/mesa/commit/?h=image-load-store-lower&id=a002ca6f0c8ccd7e687ff9a7928515278f2bf3e6
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