src/mesa/drivers/dri/intel/intel_span.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright 2011 Intel Corporation
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors:
  28  *     Chad Versace <chad@chad-versace.us>
  29  *
  30  **************************************************************************/
  31
  32 #include <stdbool.h>
  33 #include <stdint.h>
  34 #include "main/glheader.h"
  35 #include "main/macros.h"
  36 #include "main/mtypes.h"
  37 #include "main/colormac.h"
  38 #include "main/renderbuffer.h"
  39
  40 #include "intel_buffers.h"
  41 #include "intel_fbo.h"
  42 #include "intel_mipmap_tree.h"
  43 #include "intel_screen.h"
  44 #include "intel_span.h"
  45 #include "intel_regions.h"
  46 #include "intel_tex.h"
  47
  48 #include "swrast/swrast.h"
  49 #include "swrast/s_renderbuffer.h"
  50
  51 /**
  52  * \brief Get pointer offset into stencil buffer.
  53  *
  54  * The stencil buffer is W tiled. Since the GTT is incapable of W fencing, we
  55  * must decode the tile's layout in software.
  56  *
  57  * See
  58  *   - PRM, 2011 Sandy Bridge, Volume 1, Part 2, Section 4.5.2.1 W-Major Tile
  59  *     Format.
  60  *   - PRM, 2011 Sandy Bridge, Volume 1, Part 2, Section 4.5.3 Tiling Algorithm
  61  *
  62  * Even though the returned offset is always positive, the return type is
  63  * signed due to
  64  *    commit e8b1c6d6f55f5be3bef25084fdd8b6127517e137
  65  *    mesa: Fix return type of  _mesa_get_format_bytes() (#37351)
  66  */
  67 intptr_t
  68 intel_offset_S8(uint32_t stride, uint32_t x, uint32_t y, bool swizzled)
  69 {
  70    uint32_t tile_size = 4096;
  71    uint32_t tile_width = 64;
  72    uint32_t tile_height = 64;
  73    uint32_t row_size = 64 * stride;
  74
  75    uint32_t tile_x = x / tile_width;
  76    uint32_t tile_y = y / tile_height;
  77
  78    /* The byte's address relative to the tile's base addres. */
  79    uint32_t byte_x = x % tile_width;
  80    uint32_t byte_y = y % tile_height;
  81
  82    uintptr_t u = tile_y * row_size
  83                + tile_x * tile_size
  84                + 512 * (byte_x / 8)
  85                +  64 * (byte_y / 8)
  86                +  32 * ((byte_y / 4) % 2)
  87                +  16 * ((byte_x / 4) % 2)
  88                +   8 * ((byte_y / 2) % 2)
  89                +   4 * ((byte_x / 2) % 2)
  90                +   2 * (byte_y % 2)
  91                +   1 * (byte_x % 2);
  92
  93    if (swizzled) {
  94       /* adjust for bit6 swizzling */
  95       if (((byte_x / 8) % 2) == 1) {
  96          if (((byte_y / 8) % 2) == 0) {
  97             u += 64;
  98          } else {
  99             u -= 64;
 100          }
 101       }
 102    }
 103
 104    return u;
 105 }
 106
 107 /**
 108  * Map the regions needed by intelSpanRenderStart().
 109  */
 110 static void
 111 intel_span_map_buffers(struct intel_context *intel)
 112 {
 113    struct gl_context *ctx = &intel->ctx;
 114    struct intel_texture_object *tex_obj;
 115
 116    for (int i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
 117       if (!ctx->Texture.Unit[i]._ReallyEnabled)
 118          continue;
 119       tex_obj = intel_texture_object(ctx->Texture.Unit[i]._Current);
 120       intel_finalize_mipmap_tree(intel, i);
 121       intel_tex_map_images(intel, tex_obj,
 122                            GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
 123    }
 124
 125    _swrast_map_renderbuffers(ctx);
 126 }
 127
 128 /**
 129  * Prepare for software rendering.  Map current read/draw framebuffers'
 130  * renderbuffes and all currently bound texture objects.
 131  *
 132  * Old note: Moved locking out to get reasonable span performance.
 133  */
 134 void
 135 intelSpanRenderStart(struct gl_context * ctx)
 136 {
 137    struct intel_context *intel = intel_context(ctx);
 138
 139    intel_flush(ctx);
 140    intel_prepare_render(intel);
 141    intel_flush(ctx);
 142    intel_span_map_buffers(intel);
 143 }
 144
 145 /**
 146  * Called when done software rendering.  Unmap the buffers we mapped in
 147  * the above function.
 148  */
 149 void
 150 intelSpanRenderFinish(struct gl_context * ctx)
 151 {
 152    struct intel_context *intel = intel_context(ctx);
 153    GLuint i;
 154
 155    _swrast_flush(ctx);
 156
 157    for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
 158       if (ctx->Texture.Unit[i]._ReallyEnabled) {
 159          struct gl_texture_object *texObj = ctx->Texture.Unit[i]._Current;
 160          intel_tex_unmap_images(intel, intel_texture_object(texObj));
 161       }
 162    }
 163
 164    _swrast_unmap_renderbuffers(ctx);
 165 }
 166
 167
 168 void
 169 intelInitSpanFuncs(struct gl_context * ctx)
 170 {
 171    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference(ctx);
 172    if (swdd) {
 173       swdd->SpanRenderStart = intelSpanRenderStart;
 174       swdd->SpanRenderFinish = intelSpanRenderFinish;
 175    }
 176 }
 177
 178 void
 179 intel_map_vertex_shader_textures(struct gl_context *ctx)
 180 {
 181    struct intel_context *intel = intel_context(ctx);
 182    int i;
 183
 184    if (ctx->VertexProgram._Current == NULL)
 185       return;
 186
 187    for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
 188       if (ctx->Texture.Unit[i]._ReallyEnabled &&
 189           ctx->VertexProgram._Current->Base.TexturesUsed[i] != 0) {
 190          struct gl_texture_object *texObj = ctx->Texture.Unit[i]._Current;
 191
 192          intel_tex_map_images(intel, intel_texture_object(texObj),
 193                               GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
 194       }
 195    }
 196 }
 197
 198 void
 199 intel_unmap_vertex_shader_textures(struct gl_context *ctx)
 200 {
 201    struct intel_context *intel = intel_context(ctx);
 202    int i;
 203
 204    if (ctx->VertexProgram._Current == NULL)
 205       return;
 206
 207    for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
 208       if (ctx->Texture.Unit[i]._ReallyEnabled &&
 209           ctx->VertexProgram._Current->Base.TexturesUsed[i] != 0) {
 210          struct gl_texture_object *texObj = ctx->Texture.Unit[i]._Current;
 211
 212          intel_tex_unmap_images(intel, intel_texture_object(texObj));
 213       }
 214    }
 215 }