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 "swrast/swrast.h"
  33 #include "swrast/s_context.h"
  34
  35
  36 /**
  37  * Allocate a new swrast_texture_image (a subclass of gl_texture_image).
  38  * Called via ctx->Driver.NewTextureImage().
  39  */
  40 struct gl_texture_image *
  41 _swrast_new_texture_image( struct gl_context *ctx )
  42 {
  43    (void) ctx;
  44    return (struct gl_texture_image *) CALLOC_STRUCT(swrast_texture_image);
  45 }
  46
  47
  48 /**
  49  * Free a swrast_texture_image (a subclass of gl_texture_image).
  50  * Called via ctx->Driver.DeleteTextureImage().
  51  */
  52 void
  53 _swrast_delete_texture_image(struct gl_context *ctx,
  54                              struct gl_texture_image *texImage)
  55 {
  56    /* Nothing special for the subclass yet */
  57    _mesa_delete_texture_image(ctx, texImage);
  58 }
  59
  60
  61 /**
  62  * Called via ctx->Driver.AllocTextureImageBuffer()
  63  */
  64 GLboolean
  65 _swrast_alloc_texture_image_buffer(struct gl_context *ctx,
  66                                    struct gl_texture_image *texImage,
  67                                    gl_format format, GLsizei width,
  68                                    GLsizei height, GLsizei depth)
  69 {
  70    struct swrast_texture_image *swImg = swrast_texture_image(texImage);
  71    GLuint bytes = _mesa_format_image_size(format, width, height, depth);
  72    GLuint i;
  73
  74    /* This _should_ be true (revisit if these ever fail) */
  75    assert(texImage->Width == width);
  76    assert(texImage->Height == height);
  77    assert(texImage->Depth == depth);
  78
  79    assert(!swImg->Buffer);
  80    swImg->Buffer = _mesa_align_malloc(bytes, 512);
  81    if (!swImg->Buffer)
  82       return GL_FALSE;
  83
  84    /* RowStride and ImageOffsets[] describe how to address texels in 'Data' */
  85    swImg->RowStride = width;
  86
  87    /* Allocate the ImageOffsets array and initialize to typical values.
  88     * We allocate the array for 1D/2D textures too in order to avoid special-
  89     * case code in the texstore routines.
  90     */
  91    swImg->ImageOffsets = (GLuint *) malloc(depth * sizeof(GLuint));
  92    if (!swImg->ImageOffsets)
  93       return GL_FALSE;
  94
  95    for (i = 0; i < depth; i++) {
  96       swImg->ImageOffsets[i] = i * width * height;
  97    }
  98
  99    if ((width == 1 || _mesa_is_pow_two(texImage->Width2)) &&
 100        (height == 1 || _mesa_is_pow_two(texImage->Height2)) &&
 101        (depth == 1 || _mesa_is_pow_two(texImage->Depth2)))
 102       swImg->_IsPowerOfTwo = GL_TRUE;
 103    else
 104       swImg->_IsPowerOfTwo = GL_FALSE;
 105
 106    /* Compute Width/Height/DepthScale for mipmap lod computation */
 107    if (texImage->TexObject->Target == GL_TEXTURE_RECTANGLE_NV) {
 108       /* scale = 1.0 since texture coords directly map to texels */
 109       swImg->WidthScale = 1.0;
 110       swImg->HeightScale = 1.0;
 111       swImg->DepthScale = 1.0;
 112    }
 113    else {
 114       swImg->WidthScale = (GLfloat) texImage->Width;
 115       swImg->HeightScale = (GLfloat) texImage->Height;
 116       swImg->DepthScale = (GLfloat) texImage->Depth;
 117    }
 118
 119    return GL_TRUE;
 120 }
 121
 122
 123 /**
 124  * Called via ctx->Driver.FreeTextureImageBuffer()
 125  */
 126 void
 127 _swrast_free_texture_image_buffer(struct gl_context *ctx,
 128                                   struct gl_texture_image *texImage)
 129 {
 130    struct swrast_texture_image *swImage = swrast_texture_image(texImage);
 131    if (swImage->Buffer) {
 132       _mesa_align_free(swImage->Buffer);
 133       swImage->Buffer = NULL;
 134    }
 135
 136    if (swImage->ImageOffsets) {
 137       free(swImage->ImageOffsets);
 138       swImage->ImageOffsets = NULL;
 139    }
 140 }
 141
 142
 143 /**
 144  * Error checking for debugging only.
 145  */
 146 static void
 147 _mesa_check_map_teximage(struct gl_texture_image *texImage,
 148                          GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h)
 149 {
 150
 151    if (texImage->TexObject->Target == GL_TEXTURE_1D)
 152       assert(y == 0 && h == 1);
 153
 154    assert(x < texImage->Width || texImage->Width == 0);
 155    assert(y < texImage->Height || texImage->Height == 0);
 156    assert(x + w <= texImage->Width);
 157    assert(y + h <= texImage->Height);
 158 }
 159
 160 /**
 161  * Map a 2D slice of a texture image into user space.
 162  * (x,y,w,h) defines a region of interest (ROI).  Reading/writing texels
 163  * outside of the ROI is undefined.
 164  *
 165  * \param texImage  the texture image
 166  * \param slice  the 3D image slice or array texture slice
 167  * \param x, y, w, h  region of interest
 168  * \param mode  bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT
 169  * \param mapOut  returns start of mapping of region of interest
 170  * \param rowStrideOut  returns row stride (in bytes)
 171  */
 172 void
 173 _swrast_map_teximage(struct gl_context *ctx,
 174                      struct gl_texture_image *texImage,
 175                      GLuint slice,
 176                      GLuint x, GLuint y, GLuint w, GLuint h,
 177                      GLbitfield mode,
 178                      GLubyte **mapOut,
 179                      GLint *rowStrideOut)
 180 {
 181    struct swrast_texture_image *swImage = swrast_texture_image(texImage);
 182    GLubyte *map;
 183    GLint stride, texelSize;
 184    GLuint bw, bh;
 185
 186    _mesa_check_map_teximage(texImage, slice, x, y, w, h);
 187
 188    texelSize = _mesa_get_format_bytes(texImage->TexFormat);
 189    stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
 190    _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
 191
 192    assert(swImage->Buffer);
 193
 194    map = swImage->Buffer;
 195
 196    if (texImage->TexObject->Target == GL_TEXTURE_3D ||
 197        texImage->TexObject->Target == GL_TEXTURE_2D_ARRAY) {
 198       GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
 199                                                  texImage->Width,
 200                                                  texImage->Height,
 201                                                  1);
 202       assert(slice < texImage->Depth);
 203       map += slice * sliceSize;
 204    } else if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
 205       GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
 206                                                  texImage->Width,
 207                                                  1,
 208                                                  1);
 209       assert(slice < texImage->Height);
 210       map += slice * sliceSize;
 211    }
 212
 213    /* apply x/y offset to map address */
 214    map += stride * (y / bh) + texelSize * (x / bw);
 215
 216    *mapOut = map;
 217    *rowStrideOut = stride;
 218 }
 219
 220 void
 221 _swrast_unmap_teximage(struct gl_context *ctx,
 222                        struct gl_texture_image *texImage,
 223                        GLuint slice)
 224 {
 225    /* nop */
 226 }
 227
 228
 229 void
 230 _swrast_map_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
 231 {
 232    const GLuint faces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
 233    GLuint face, level;
 234
 235    for (face = 0; face < faces; face++) {
 236       for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
 237          struct gl_texture_image *texImage = texObj->Image[face][level];
 238          if (texImage) {
 239             struct swrast_texture_image *swImage =
 240                swrast_texture_image(texImage);
 241
 242             /* XXX we'll eventually call _swrast_map_teximage() here */
 243             swImage->Data = swImage->Buffer;
 244             assert(swImage->Buffer);
 245          }
 246       }
 247    }
 248 }
 249
 250
 251 void
 252 _swrast_unmap_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
 253 {
 254    const GLuint faces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
 255    GLuint face, level;
 256
 257    for (face = 0; face < faces; face++) {
 258       for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
 259          struct gl_texture_image *texImage = texObj->Image[face][level];
 260          if (texImage) {
 261             struct swrast_texture_image *swImage
 262                = swrast_texture_image(texImage);
 263
 264             /* XXX we'll eventually call _swrast_unmap_teximage() here */
 265             swImage->Data = NULL;
 266          }
 267       }
 268    }
 269 }
 270
 271
 272 /**
 273  * Map all textures for reading prior to software rendering.
 274  */
 275 void
 276 _swrast_map_textures(struct gl_context *ctx)
 277 {
 278    GLbitfield enabledUnits = ctx->Texture._EnabledUnits;
 279
 280    /* loop over enabled texture units */
 281    while (enabledUnits) {
 282       GLuint unit = _mesa_ffs(enabledUnits) - 1;
 283       struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 284
 285       _swrast_map_texture(ctx, texObj);
 286
 287       enabledUnits &= ~(1 << unit);
 288    }
 289 }
 290
 291
 292 /**
 293  * Unmap all textures for reading prior to software rendering.
 294  */
 295 void
 296 _swrast_unmap_textures(struct gl_context *ctx)
 297 {
 298    GLbitfield enabledUnits = ctx->Texture._EnabledUnits;
 299
 300    /* loop over enabled texture units */
 301    while (enabledUnits) {
 302       GLuint unit = _mesa_ffs(enabledUnits) - 1;
 303       struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 304
 305       _swrast_unmap_texture(ctx, texObj);
 306
 307       enabledUnits &= ~(1 << unit);
 308    }
 309 }
 310
 311
 312 /**
 313  * Map or unmap any textures that we may be rendering to as renderbuffers.
 314  */
 315 static void
 316 map_unmap_renderbuffers(struct gl_context *ctx,
 317                         struct gl_framebuffer *fb,
 318                         GLboolean map)
 319 {
 320    GLuint i;
 321
 322    for (i = 0; i < Elements(fb->Attachment); i++) {
 323       struct gl_texture_object *texObj = fb->Attachment[i].Texture;
 324       if (texObj) {
 325          const GLuint level = fb->Attachment[i].TextureLevel;
 326          const GLuint face = fb->Attachment[i].CubeMapFace;
 327          struct gl_texture_image *texImage = texObj->Image[face][level];
 328          if (texImage) {
 329             struct swrast_texture_image *swImage
 330                = swrast_texture_image(texImage);
 331
 332             if (map) {
 333                /* XXX we'll eventually call _swrast_map_teximage() here */
 334                swImage->Data = swImage->Buffer;
 335             }
 336             else {
 337                /* XXX we'll eventually call _swrast_unmap_teximage() here */
 338                swImage->Data = NULL;
 339             }
 340          }
 341       }
 342    }
 343 }
 344
 345
 346 void
 347 _swrast_map_renderbuffers(struct gl_context *ctx)
 348 {
 349    map_unmap_renderbuffers(ctx, ctx->DrawBuffer, GL_TRUE);
 350    if (ctx->ReadBuffer != ctx->DrawBuffer)
 351       map_unmap_renderbuffers(ctx, ctx->ReadBuffer, GL_TRUE);
 352 }
 353
 354
 355 void
 356 _swrast_unmap_renderbuffers(struct gl_context *ctx)
 357 {
 358    map_unmap_renderbuffers(ctx, ctx->DrawBuffer, GL_FALSE);
 359    if (ctx->ReadBuffer != ctx->DrawBuffer)
 360       map_unmap_renderbuffers(ctx, ctx->ReadBuffer, GL_FALSE);
 361 }
 362
 363
 364
 365 /**
 366  * Called via ctx->Driver.AllocTextureStorage()
 367  * Just have to allocate memory for the texture images.
 368  */
 369 GLboolean
 370 _swrast_AllocTextureStorage(struct gl_context *ctx,
 371                             struct gl_texture_object *texObj,
 372                             GLsizei levels, GLsizei width,
 373                             GLsizei height, GLsizei depth)
 374 {
 375    const GLint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 376    GLint face, level;
 377
 378    for (face = 0; face < numFaces; face++) {
 379       for (level = 0; level < levels; level++) {
 380          struct gl_texture_image *texImage = texObj->Image[face][level];
 381          if (!_swrast_alloc_texture_image_buffer(ctx, texImage,
 382                                                  texImage->TexFormat,
 383                                                  texImage->Width,
 384                                                  texImage->Height,
 385                                                  texImage->Depth)) {
 386             return GL_FALSE;
 387          }
 388       }
 389    }
 390
 391    return GL_TRUE;
 392 }
 393