src/mesa/drivers/dri/i965/gen8_surface_state.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "main/blend.h"
  25 #include "main/mtypes.h"
  26 #include "main/samplerobj.h"
  27 #include "main/texformat.h"
  28 #include "main/teximage.h"
  29 #include "program/prog_parameter.h"
  30 #include "program/prog_instruction.h"
  31
  32 #include "intel_mipmap_tree.h"
  33 #include "intel_batchbuffer.h"
  34 #include "intel_tex.h"
  35 #include "intel_fbo.h"
  36 #include "intel_buffer_objects.h"
  37 #include "intel_image.h"
  38
  39 #include "brw_context.h"
  40 #include "brw_state.h"
  41 #include "brw_defines.h"
  42 #include "brw_wm.h"
  43 #include "isl/isl.h"
  44
  45 static uint32_t *
  46 gen8_allocate_surface_state(struct brw_context *brw, uint32_t *out_offset)
  47 {
  48    uint32_t *surf = brw_state_batch(brw, 64, 64, out_offset);
  49    memset(surf, 0, 64);
  50    return surf;
  51 }
  52
  53 /**
  54  * Creates a null surface.
  55  *
  56  * This is used when the shader doesn't write to any color output.  An FB
  57  * write to target 0 will still be emitted, because that's how the thread is
  58  * terminated (and computed depth is returned), so we need to have the
  59  * hardware discard the target 0 color output..
  60  */
  61 static void
  62 gen8_emit_null_surface_state(struct brw_context *brw,
  63                              unsigned width,
  64                              unsigned height,
  65                              unsigned samples,
  66                              uint32_t *out_offset)
  67 {
  68    uint32_t *surf = gen8_allocate_surface_state(brw, out_offset);
  69
  70    surf[0] = BRW_SURFACE_NULL << BRW_SURFACE_TYPE_SHIFT |
  71              ISL_FORMAT_B8G8R8A8_UNORM << BRW_SURFACE_FORMAT_SHIFT |
  72              GEN8_SURFACE_TILING_Y;
  73    surf[2] = SET_FIELD(width - 1, GEN7_SURFACE_WIDTH) |
  74              SET_FIELD(height - 1, GEN7_SURFACE_HEIGHT);
  75 }
  76
  77 void
  78 gen8_init_vtable_surface_functions(struct brw_context *brw)
  79 {
  80    brw->vtbl.update_renderbuffer_surface = brw_update_renderbuffer_surface;
  81    brw->vtbl.emit_null_surface_state = gen8_emit_null_surface_state;
  82 }