[Mesa-dev] [v2 5/8] i965/meta: Stencil blits
Kenneth Graunke
kenneth at whitecape.org
Thu May 15 01:41:10 PDT 2014
On 05/15/2014 01:22 AM, Pohjolainen, Topi wrote:
> On Thu, May 15, 2014 at 12:57:42AM -0700, Kenneth Graunke wrote:
>> On 05/12/2014 08:42 AM, Topi Pohjolainen wrote:
>>> v2: Create the intel renderbuffer with level hardcoded to zero instead
>>> of overriding it in the surface state configuration. Also moved the
>>> dimension adjustments for tiling, mip level, msaa into the render
>>> buffer creation. Finally prepares for another blit path needed for
>>> miptree updownsampling.
>>>
>>> Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
>>> ---
>>> src/mesa/drivers/dri/i965/Makefile.sources | 1 +
>>> src/mesa/drivers/dri/i965/brw_context.h | 6 +
>>> src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c | 492 ++++++++++++++++++++++
>>> 3 files changed, 499 insertions(+)
>>> create mode 100644 src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c
>>>
>>> diff --git a/src/mesa/drivers/dri/i965/Makefile.sources b/src/mesa/drivers/dri/i965/Makefile.sources
>>> index 9379fd2..5fc90b5 100644
>>> --- a/src/mesa/drivers/dri/i965/Makefile.sources
>>> +++ b/src/mesa/drivers/dri/i965/Makefile.sources
>>> @@ -76,6 +76,7 @@ i965_FILES = \
>>> brw_lower_texture_gradients.cpp \
>>> brw_lower_unnormalized_offset.cpp \
>>> brw_meta_updownsample.c \
>>> + brw_meta_stencil_blit.c \
>>> brw_meta_util.c \
>>> brw_misc_state.c \
>>> brw_object_purgeable.c \
>>> diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
>>> index 6d4a5b5..d6b7f16 100644
>>> --- a/src/mesa/drivers/dri/i965/brw_context.h
>>> +++ b/src/mesa/drivers/dri/i965/brw_context.h
>>> @@ -1482,6 +1482,12 @@ GLuint brw_get_rb_for_slice(struct brw_context *brw,
>>> void brw_meta_updownsample(struct brw_context *brw,
>>> struct intel_mipmap_tree *src,
>>> struct intel_mipmap_tree *dst);
>>> +
>>> +void brw_meta_fbo_stencil_blit(struct brw_context *brw,
>>> + GLfloat srcX0, GLfloat srcY0,
>>> + GLfloat srcX1, GLfloat srcY1,
>>> + GLfloat dstX0, GLfloat dstY0,
>>> + GLfloat dstX1, GLfloat dstY1);
>>> /*======================================================================
>>> * brw_misc_state.c
>>> */
>>> diff --git a/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c b/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c
>>> new file mode 100644
>>> index 0000000..c38987e
>>> --- /dev/null
>>> +++ b/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c
>>> @@ -0,0 +1,492 @@
>>> +/*
>>> + * Copyright © 2014 Intel Corporation
>>> + *
>>> + * Permission is hereby granted, free of charge, to any person obtaining a
>>> + * copy of this software and associated documentation files (the "Software"),
>>> + * to deal in the Software without restriction, including without limitation
>>> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
>>> + * and/or sell copies of the Software, and to permit persons to whom the
>>> + * Software is furnished to do so, subject to the following conditions:
>>> + *
>>> + * The above copyright notice and this permission notice (including the next
>>> + * paragraph) shall be included in all copies or substantial portions of the
>>> + * Software.
>>> + *
>>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
>>> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
>>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
>>> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
>>> + * IN THE SOFTWARE.
>>> + */
>>> +
>>> +/**
>>> + * @file brw_meta_stencil_blit.c
>>> + *
>>> + * Implements upsampling, downsampling and scaling of stencil miptrees. The
>>> + * logic can be originally found in brw_blorp_blit.c.
>>> + * Implementation creates a temporary draw framebuffer object and attaches the
>>> + * destination stencil buffer attachment as color attachment. Source attachment
>>> + * is in turn treated as a stencil texture and the glsl program used for the
>>> + * blitting samples it using stencil-indexing.
>>> + *
>>> + * Unfortunately as the data port does not support interleaved msaa-surfaces
>>> + * (stencil is always IMS), the glsl program needs to handle the writing of
>>> + * individual samples manually. Surface is configured as if it were single
>>> + * sampled (with adjusted dimensions) and the glsl program extracts the
>>> + * sample indices from the input coordinates for correct texturing.
>>> + *
>>> + * Target surface is also configured as Y-tiled instead of W-tiled in order
>>> + * to support generations 6-7. Later hardware supports W-tiled as render target
>>> + * and the logic here could be simplified for those.
>>> + */
>>> +
>>> +#include "brw_context.h"
>>> +#include "intel_batchbuffer.h"
>>> +#include "intel_fbo.h"
>>> +
>>> +#include "main/blit.h"
>>> +#include "main/buffers.h"
>>> +#include "main/fbobject.h"
>>> +#include "main/uniforms.h"
>>> +#include "main/texparam.h"
>>> +#include "main/texobj.h"
>>> +#include "main/viewport.h"
>>> +#include "main/enable.h"
>>> +#include "main/blend.h"
>>> +#include "main/varray.h"
>>> +#include "main/shaderapi.h"
>>> +#include "glsl/ralloc.h"
>>> +
>>> +#include "drivers/common/meta.h"
>>> +#include "brw_meta_util.h"
>>> +
>>> +#define FILE_DEBUG_FLAG DEBUG_FBO
>>> +
>>> +struct blit_dims {
>>> + int src_x0, src_y0, src_x1, src_y1;
>>> + int dst_x0, dst_y0, dst_x1, dst_y1;
>>> + bool mirror_x, mirror_y;
>>> +};
>>> +
>>> +static const char *vs_source =
>>> + "#version 130\n"
>>> + "in vec2 position;\n"
>>> + "out vec2 tex_coords;\n"
>>> + "void main()\n"
>>> + "{\n"
>>> + " tex_coords = (position + 1.0) / 2.0;\n"
>>> + " gl_Position = vec4(position, 0.0, 1.0);\n"
>>> + "}\n";
>>> +
>>> +static const struct sampler_and_fetch {
>>> + const char *sampler;
>>> + const char *fetch;
>>> +} samplers[] = {
>>> + { "uniform usampler2D texSampler;\n",
>>> + " out_color = texelFetch(texSampler, txl_coords, 0)" },
>>> + { "#extension GL_ARB_texture_multisample : enable\n"
>>> + "uniform usampler2DMS texSampler;\n",
>>> + " out_color = texelFetch(texSampler, txl_coords, sample_index)" }
>>> +};
>>> +
>>> +/**
>>> + * Translating Y-tiled to W-tiled:
>>> + *
>>> + * X' = (X & ~0b1011) >> 1 | (Y & 0b1) << 2 | X & 0b1
>>> + * Y' = (Y & ~0b1) << 1 | (X & 0b1000) >> 2 | (X & 0b10) >> 1
>>> + */
>>> +static const char *fs_tmpl =
>>> + "#version 130\n"
>>> + "%s"
>>> + "uniform float src_x_scale;\n"
>>> + "uniform float src_y_scale;\n"
>>> + "uniform float src_x_off;\n" /* Top right coordinates of the source */
>>> + "uniform float src_y_off;\n" /* rectangle in W-tiled space. */
>>> + "uniform float dst_x_off;\n" /* Top right coordinates of the target */
>>> + "uniform float dst_y_off;\n" /* rectangle in Y-tiled space. */
>>> + "uniform float draw_rect_w;\n" /* This is the unnormalized size of the */
>>> + "uniform float draw_rect_h;\n" /* drawing rectangle in Y-tiled space. */
>>> + "uniform int dst_x0;\n" /* This is the bounding rectangle in the W-tiled */
>>> + "uniform int dst_x1;\n" /* space that will be used to skip pixels lying */
>>> + "uniform int dst_y0;\n" /* outside. In some cases the Y-tiled rectangle */
>>> + "uniform int dst_y1;\n" /* is larger. */
>>> + "uniform int dst_num_samples;\n"
>>> + "in vec2 tex_coords;\n"
>>> + "ivec2 txl_coords;\n"
>>> + "int sample_index;\n"
>>> + "out uvec4 out_color;\n"
>>> + "\n"
>>> + "void get_unorm_target_coords()\n"
>>> + "{\n"
>>> + " txl_coords.x = int(tex_coords.x * draw_rect_w + dst_x_off);\n"
>>> + " txl_coords.y = int(tex_coords.y * draw_rect_h + dst_y_off);\n"
>>> + "}\n"
>>> + "\n"
>>> + "void translate_dst_to_src()\n"
>>> + "{\n"
>>> + " txl_coords.x = int(float(txl_coords.x) * src_x_scale + src_x_off);\n"
>>> + " txl_coords.y = int(float(txl_coords.y) * src_y_scale + src_y_off);\n"
>>> + "}\n"
>>> + "\n"
>>> + "void translate_y_to_w_tiling()\n"
>>> + "{\n"
>>> + " int X = txl_coords.x;\n"
>>> + " int Y = txl_coords.y;\n"
>>> + " txl_coords.x = (X & int(0xfff4)) >> 1;\n"
>>> + " txl_coords.x |= ((Y & int(0x1)) << 2);\n"
>>> + " txl_coords.x |= (X & int(0x1));\n"
>>> + " txl_coords.y = (Y & int(0xfffe)) << 1;\n"
>>> + " txl_coords.y |= ((X & int(0x8)) >> 2);\n"
>>> + " txl_coords.y |= ((X & int(0x2)) >> 1);\n"
>>> + "}\n"
>>> + "\n"
>>> + "void decode_msaa()\n"
>>> + "{\n"
>>> + " int X = txl_coords.x;\n"
>>> + " int Y = txl_coords.y;\n"
>>> + " switch (dst_num_samples) {\n"
>>> + " case 0:\n"
>>> + " sample_index = 0;\n"
>>> + " break;\n"
>>> + " case 2:\n"
>>> + " txl_coords.x = ((X & int(0xfffc)) >> 1) | (X & int(0x1));\n"
>>> + " sample_index = (X & 0x2) >> 1;\n"
>>> + " break;\n"
>>> + " case 4:\n"
>>> + " txl_coords.x = ((X & int(0xfffc)) >> 1) | (X & int(0x1));\n"
>>> + " txl_coords.y = ((Y & int(0xfffc)) >> 1) | (Y & int(0x1));\n"
>>> + " sample_index = (Y & 0x2) | ((X & 0x2) >> 1);\n"
>>> + " break;\n"
>>> + " case 8:\n"
>>> + " txl_coords.x = ((X & int(0xfff8)) >> 2) | (X & int(0x1));\n"
>>> + " txl_coords.y = ((Y & int(0xfffc)) >> 1) | (Y & int(0x1));\n"
>>> + " sample_index = (X & 0x4) | (Y & 0x2) | ((X & 0x2) >> 1);\n"
>>> + " }\n"
>>> + "}\n"
>>> + "\n"
>>> + "void discard_outside_bounding_rect()\n"
>>> + "{\n"
>>> + " int X = txl_coords.x;\n"
>>> + " int Y = txl_coords.y;\n"
>>> + " if (X >= dst_x1 || X < dst_x0 || Y >= dst_y1 || Y < dst_y0)\n"
>>> + " discard;\n"
>>> + "}\n"
>>> + "\n"
>>> + "void main()\n"
>>> + "{\n"
>>> + " get_unorm_target_coords();\n"
>>> + " translate_y_to_w_tiling();\n"
>>> + " decode_msaa();"
>>> + " discard_outside_bounding_rect();\n"
>>> + " translate_dst_to_src();\n"
>>> + " %s;\n"
>>> + "}\n";
>>> +
>>> +/**
>>> + * Setup uniforms telling the coordinates of the destination rectangle in the
>>> + * native w-tiled space. These are needed to ignore pixels that lie outside.
>>> + * The destination is drawn as Y-tiled and in some cases the Y-tiled drawing
>>> + * rectangle is larger than the original (for example 1x4 w-tiled requires
>>> + * 16x2 y-tiled).
>>> + */
>>> +static void
>>> +setup_bounding_rect(GLuint prog, const struct blit_dims *dims)
>>> +{
>>> + _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_x0"), dims->dst_x0);
>>> + _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_x1"), dims->dst_x1);
>>> + _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_y0"), dims->dst_y0);
>>> + _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_y1"), dims->dst_y1);
>>> +}
>>> +
>>> +/**
>>> + * Setup uniforms telling the destination width, height and the offset. These
>>> + * are needed to unnoormalize the input coordinates and to correctly translate
>>> + * between destination and source that may have differing offsets.
>>> + */
>>> +static void
>>> +setup_drawing_rect(GLuint prog, const struct blit_dims *dims)
>>> +{
>>> + _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "draw_rect_w"),
>>> + dims->dst_x1 - dims->dst_x0);
>>> + _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "draw_rect_h"),
>>> + dims->dst_y1 - dims->dst_y0);
>>> + _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "dst_x_off"), dims->dst_x0);
>>> + _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "dst_y_off"), dims->dst_y0);
>>> +}
>>> +
>>> +/**
>>> + * When not mirroring a coordinate (say, X), we need:
>>> + * src_x - src_x0 = (dst_x - dst_x0 + 0.5) * scale
>>> + * Therefore:
>>> + * src_x = src_x0 + (dst_x - dst_x0 + 0.5) * scale
>>> + *
>>> + * The program uses "round toward zero" to convert the transformed floating
>>> + * point coordinates to integer coordinates, whereas the behaviour we actually
>>> + * want is "round to nearest", so 0.5 provides the necessary correction.
>>> + *
>>> + * When mirroring X we need:
>>> + * src_x - src_x0 = dst_x1 - dst_x - 0.5
>>> + * Therefore:
>>> + * src_x = src_x0 + (dst_x1 -dst_x - 0.5) * scale
>>> + */
>>> +static void
>>> +setup_coord_coeff(GLuint prog, GLuint multiplier, GLuint offset,
>>> + int src_0, int src_1, int dst_0, int dst_1, bool mirror)
>>> +{
>>> + const float scale = ((float)(src_1 - src_0)) / (dst_1 - dst_0);
>>> +
>>> + if (mirror) {
>>> + _mesa_Uniform1f(multiplier, -scale);
>>> + _mesa_Uniform1f(offset, src_0 + (dst_1 - 0.5) * scale);
>>> + } else {
>>> + _mesa_Uniform1f(multiplier, scale);
>>> + _mesa_Uniform1f(offset, src_0 + (-dst_0 + 0.5) * scale);
>>> + }
>>> +}
>>> +
>>> +/**
>>> + * Setup uniforms providing relation between source and destination surfaces.
>>> + * Destination coordinates are in Y-tiling layout while texelFetch() expects
>>> + * W-tiled coordinates. Once the destination coordinates are re-interpreted by
>>> + * the program into the original W-tiled layout, the program needs to know the
>>> + * offset and scaling factors between the destination and source.
>>> + * Note that these are calculated in the original W-tiled space before the
>>> + * destination rectangle is adjusted for possible msaa and Y-tiling.
>>> + */
>>> +static void
>>> +setup_coord_transform(GLuint prog, const struct blit_dims *dims)
>>> +{
>>> + setup_coord_coeff(prog,
>>> + _mesa_GetUniformLocation(prog, "src_x_scale"),
>>> + _mesa_GetUniformLocation(prog, "src_x_off"),
>>> + dims->src_x0, dims->src_x1, dims->dst_x0, dims->dst_x1,
>>> + dims->mirror_x);
>>> +
>>> + setup_coord_coeff(prog,
>>> + _mesa_GetUniformLocation(prog, "src_y_scale"),
>>> + _mesa_GetUniformLocation(prog, "src_y_off"),
>>> + dims->src_y0, dims->src_y1, dims->dst_y0, dims->dst_y1,
>>> + dims->mirror_y);
>>> +}
>>> +
>>> +static GLuint
>>> +setup_program(struct gl_context *ctx, bool msaa_tex)
>>> +{
>>> + struct blit_state *blit = &ctx->Meta->Blit;
>>> + static GLuint prog_cache[] = { 0, 0 };
>>
>> I wonder about using static storage here, vs. storing it in a context.
>> I feel like we need to store it in the context, but I can't concretely
>> think of why this wouldn't work. We can always fix this later if it's a
>> problem.
>
> Hmm, I think you have point here. While the resulted programs do not actually
> depend on the state of the context yet (even thought the ctx->Meta->Blit is
> referenced) that may change anytime. Also I don't exactly how programs are
> scoped (can they be shared between different contexts). Hence even if it
> creates possibly many copies of identical programs for multiple contexts I
> would prefer it.
> How about I follow it up with another patch? It will introduce a little more
> dynamic and I would like to test it thoroughly before pushing.
Yeah, seems like a good plan.
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