src/gallium/drivers/panfrost/pan_blend.h

   1 /*
   2  * Copyright (C) 2019 Collabora, Ltd.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors (Collabora):
  24  *   Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
  25  *
  26  */
  27
  28 #ifndef __PAN_BLEND_H
  29 #define __PAN_BLEND_H
  30
  31 #include "util/hash_table.h"
  32
  33 /* An internal blend shader descriptor, from the compiler */
  34
  35 struct panfrost_blend_shader {
  36         struct panfrost_context *ctx;
  37
  38         /* The compiled shader */
  39         void *buffer;
  40
  41         /* Byte count of the shader */
  42         unsigned size;
  43
  44         /* Number of 128-bit work registers required by the shader */
  45         unsigned work_count;
  46
  47         /* Offset into the shader to patch constants. Zero to disable patching
  48          * (it is illogical to have constants at offset 0). */
  49         unsigned patch_index;
  50
  51         /* First instruction tag (for tagging the pointer) */
  52         unsigned first_tag;
  53 };
  54
  55 /* A blend shader descriptor ready for actual use */
  56
  57 struct panfrost_blend_shader_final {
  58         /* The compiled shader in GPU memory, possibly patched */
  59         struct panfrost_bo *bo;
  60
  61         /* First instruction tag (for tagging the pointer) */
  62         unsigned first_tag;
  63
  64         /* Same meaning as panfrost_blend_shader */
  65         unsigned work_count;
  66 };
  67
  68 struct panfrost_blend_equation_final {
  69         struct mali_blend_equation *equation;
  70         float constant;
  71 };
  72
  73 struct panfrost_blend_rt {
  74         /* If has_fixed_function is set, equation is the
  75          * fixed-function configuration for this blend state */
  76
  77         bool has_fixed_function;
  78         struct mali_blend_equation equation;
  79
  80         /* Mask of blend color components read */
  81         unsigned constant_mask;
  82
  83         /* Regardless of fixed-function blending, this is a map of pipe_format
  84          * to panfrost_blend_shader */
  85
  86         struct hash_table_u64 *shaders;
  87 };
  88
  89 struct panfrost_blend_state {
  90         struct pipe_blend_state base;
  91
  92         struct panfrost_blend_rt rt[PIPE_MAX_COLOR_BUFS];
  93 };
  94
  95 /* Container for a final blend state, specialized to constants and a
  96  * framebuffer formats. */
  97
  98 struct panfrost_blend_final {
  99         /* Set for a shader, clear for an equation */
 100         bool is_shader;
 101
 102         /* Set if the destination needs to be loaded from the tilebuffer,
 103          * basically (for an equation) or if a shader is present */
 104         bool no_blending;
 105
 106         union {
 107                 struct panfrost_blend_shader_final shader;
 108                 struct panfrost_blend_equation_final equation;
 109         };
 110 };
 111
 112 void
 113 panfrost_blend_context_init(struct pipe_context *pipe);
 114
 115 struct panfrost_blend_final
 116 panfrost_get_blend_for_context(struct panfrost_context *ctx, unsigned rt);
 117
 118 #endif