src/mesa/swrast/s_texture.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2011 VMware, Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * Functions for mapping/unmapping texture images.
  26  */
  27
  28
  29 #include "main/context.h"
  30 #include "main/fbobject.h"
  31 #include "main/teximage.h"
  32 #include "main/texobj.h"
  33 #include "swrast/swrast.h"
  34 #include "swrast/s_context.h"
  35
  36
  37 /**
  38  * Allocate a new swrast_texture_image (a subclass of gl_texture_image).
  39  * Called via ctx->Driver.NewTextureImage().
  40  */
  41 struct gl_texture_image *
  42 _swrast_new_texture_image( struct gl_context *ctx )
  43 {
  44    (void) ctx;
  45    return (struct gl_texture_image *) CALLOC_STRUCT(swrast_texture_image);
  46 }
  47
  48
  49 /**
  50  * Free a swrast_texture_image (a subclass of gl_texture_image).
  51  * Called via ctx->Driver.DeleteTextureImage().
  52  */
  53 void
  54 _swrast_delete_texture_image(struct gl_context *ctx,
  55                              struct gl_texture_image *texImage)
  56 {
  57    /* Nothing special for the subclass yet */
  58    _mesa_delete_texture_image(ctx, texImage);
  59 }
  60
  61
  62 /**
  63  * Called via ctx->Driver.AllocTextureImageBuffer()
  64  */
  65 GLboolean
  66 _swrast_alloc_texture_image_buffer(struct gl_context *ctx,
  67                                    struct gl_texture_image *texImage)
  68 {
  69    struct swrast_texture_image *swImg = swrast_texture_image(texImage);
  70    GLuint bytes = _mesa_format_image_size(texImage->TexFormat, texImage->Width,
  71                                           texImage->Height, texImage->Depth);
  72    GLuint i;
  73
  74    assert(!swImg->Buffer);
  75    swImg->Buffer = _mesa_align_malloc(bytes, 512);
  76    if (!swImg->Buffer)
  77       return GL_FALSE;
  78
  79    /* RowStride and ImageOffsets[] describe how to address texels in 'Data' */
  80    swImg->RowStride = texImage->Width;
  81
  82    /* Allocate the ImageOffsets array and initialize to typical values.
  83     * We allocate the array for 1D/2D textures too in order to avoid special-
  84     * case code in the texstore routines.
  85     */
  86    swImg->ImageOffsets = malloc(texImage->Depth * sizeof(GLuint));
  87    if (!swImg->ImageOffsets)
  88       return GL_FALSE;
  89
  90    for (i = 0; i < texImage->Depth; i++) {
  91       swImg->ImageOffsets[i] = i * texImage->Width * texImage->Height;
  92    }
  93
  94    _swrast_init_texture_image(texImage);
  95
  96    return GL_TRUE;
  97 }
  98
  99
 100 /**
 101  * Code that overrides ctx->Driver.AllocTextureImageBuffer may use this to
 102  * initialize the fields of swrast_texture_image without allocating the image
 103  * buffer or initializing ImageOffsets or RowStride.
 104  *
 105  * Returns GL_TRUE on success, GL_FALSE on memory allocation failure.
 106  */
 107 void
 108 _swrast_init_texture_image(struct gl_texture_image *texImage)
 109 {
 110    struct swrast_texture_image *swImg = swrast_texture_image(texImage);
 111
 112    if ((texImage->Width == 1 || _mesa_is_pow_two(texImage->Width2)) &&
 113        (texImage->Height == 1 || _mesa_is_pow_two(texImage->Height2)) &&
 114        (texImage->Depth == 1 || _mesa_is_pow_two(texImage->Depth2)))
 115       swImg->_IsPowerOfTwo = GL_TRUE;
 116    else
 117       swImg->_IsPowerOfTwo = GL_FALSE;
 118
 119    /* Compute Width/Height/DepthScale for mipmap lod computation */
 120    if (texImage->TexObject->Target == GL_TEXTURE_RECTANGLE_NV) {
 121       /* scale = 1.0 since texture coords directly map to texels */
 122       swImg->WidthScale = 1.0;
 123       swImg->HeightScale = 1.0;
 124       swImg->DepthScale = 1.0;
 125    }
 126    else {
 127       swImg->WidthScale = (GLfloat) texImage->Width;
 128       swImg->HeightScale = (GLfloat) texImage->Height;
 129       swImg->DepthScale = (GLfloat) texImage->Depth;
 130    }
 131 }
 132
 133
 134 /**
 135  * Called via ctx->Driver.FreeTextureImageBuffer()
 136  */
 137 void
 138 _swrast_free_texture_image_buffer(struct gl_context *ctx,
 139                                   struct gl_texture_image *texImage)
 140 {
 141    struct swrast_texture_image *swImage = swrast_texture_image(texImage);
 142    if (swImage->Buffer) {
 143       _mesa_align_free(swImage->Buffer);
 144       swImage->Buffer = NULL;
 145    }
 146
 147    free(swImage->ImageOffsets);
 148    swImage->ImageOffsets = NULL;
 149 }
 150
 151
 152 /**
 153  * Error checking for debugging only.
 154  */
 155 static void
 156 _mesa_check_map_teximage(struct gl_texture_image *texImage,
 157                          GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h)
 158 {
 159
 160    if (texImage->TexObject->Target == GL_TEXTURE_1D)
 161       assert(y == 0 && h == 1);
 162
 163    assert(x < texImage->Width || texImage->Width == 0);
 164    assert(y < texImage->Height || texImage->Height == 0);
 165    assert(x + w <= texImage->Width);
 166    assert(y + h <= texImage->Height);
 167 }
 168
 169 /**
 170  * Map a 2D slice of a texture image into user space.
 171  * (x,y,w,h) defines a region of interest (ROI).  Reading/writing texels
 172  * outside of the ROI is undefined.
 173  *
 174  * \param texImage  the texture image
 175  * \param slice  the 3D image slice or array texture slice
 176  * \param x, y, w, h  region of interest
 177  * \param mode  bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT
 178  * \param mapOut  returns start of mapping of region of interest
 179  * \param rowStrideOut  returns row stride (in bytes)
 180  */
 181 void
 182 _swrast_map_teximage(struct gl_context *ctx,
 183                      struct gl_texture_image *texImage,
 184                      GLuint slice,
 185                      GLuint x, GLuint y, GLuint w, GLuint h,
 186                      GLbitfield mode,
 187                      GLubyte **mapOut,
 188                      GLint *rowStrideOut)
 189 {
 190    struct swrast_texture_image *swImage = swrast_texture_image(texImage);
 191    GLubyte *map;
 192    GLint stride, texelSize;
 193    GLuint bw, bh;
 194
 195    _mesa_check_map_teximage(texImage, slice, x, y, w, h);
 196
 197    texelSize = _mesa_get_format_bytes(texImage->TexFormat);
 198    stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
 199    _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
 200
 201    assert(x % bw == 0);
 202    assert(y % bh == 0);
 203
 204    if (!swImage->Buffer) {
 205       /* probably ran out of memory when allocating tex mem */
 206       *mapOut = NULL;
 207       return;
 208    }
 209
 210    map = swImage->Buffer;
 211
 212    if (texImage->TexObject->Target == GL_TEXTURE_3D ||
 213        texImage->TexObject->Target == GL_TEXTURE_2D_ARRAY) {
 214       GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
 215                                                  texImage->Width,
 216                                                  texImage->Height,
 217                                                  1);
 218       assert(slice < texImage->Depth);
 219       map += slice * sliceSize;
 220    } else if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
 221       GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
 222                                                  texImage->Width,
 223                                                  1,
 224                                                  1);
 225       assert(slice < texImage->Height);
 226       map += slice * sliceSize;
 227    }
 228
 229    /* apply x/y offset to map address */
 230    map += stride * (y / bh) + texelSize * (x / bw);
 231
 232    *mapOut = map;
 233    *rowStrideOut = stride;
 234 }
 235
 236 void
 237 _swrast_unmap_teximage(struct gl_context *ctx,
 238                        struct gl_texture_image *texImage,
 239                        GLuint slice)
 240 {
 241    /* nop */
 242 }
 243
 244
 245 void
 246 _swrast_map_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
 247 {
 248    const GLuint faces = _mesa_num_tex_faces(texObj->Target);
 249    GLuint face, level;
 250
 251    for (face = 0; face < faces; face++) {
 252       for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
 253          struct gl_texture_image *texImage = texObj->Image[face][level];
 254          if (texImage) {
 255             struct swrast_texture_image *swImage =
 256                swrast_texture_image(texImage);
 257
 258             /* XXX we'll eventually call _swrast_map_teximage() here */
 259             swImage->Map = swImage->Buffer;
 260          }
 261       }
 262    }
 263 }
 264
 265
 266 void
 267 _swrast_unmap_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
 268 {
 269    const GLuint faces = _mesa_num_tex_faces(texObj->Target);
 270    GLuint face, level;
 271
 272    for (face = 0; face < faces; face++) {
 273       for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
 274          struct gl_texture_image *texImage = texObj->Image[face][level];
 275          if (texImage) {
 276             struct swrast_texture_image *swImage
 277                = swrast_texture_image(texImage);
 278
 279             /* XXX we'll eventually call _swrast_unmap_teximage() here */
 280             swImage->Map = NULL;
 281          }
 282       }
 283    }
 284 }
 285
 286
 287 /**
 288  * Map all textures for reading prior to software rendering.
 289  */
 290 void
 291 _swrast_map_textures(struct gl_context *ctx)
 292 {
 293    GLbitfield enabledUnits = ctx->Texture._EnabledUnits;
 294
 295    /* loop over enabled texture units */
 296    while (enabledUnits) {
 297       GLuint unit = ffs(enabledUnits) - 1;
 298       struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 299
 300       _swrast_map_texture(ctx, texObj);
 301
 302       enabledUnits &= ~(1 << unit);
 303    }
 304 }
 305
 306
 307 /**
 308  * Unmap all textures for reading prior to software rendering.
 309  */
 310 void
 311 _swrast_unmap_textures(struct gl_context *ctx)
 312 {
 313    GLbitfield enabledUnits = ctx->Texture._EnabledUnits;
 314
 315    /* loop over enabled texture units */
 316    while (enabledUnits) {
 317       GLuint unit = ffs(enabledUnits) - 1;
 318       struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 319
 320       _swrast_unmap_texture(ctx, texObj);
 321
 322       enabledUnits &= ~(1 << unit);
 323    }
 324 }