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(x % bw == 0);
 193    assert(y % bh == 0);
 194
 195    if (!swImage->Buffer) {
 196       /* probably ran out of memory when allocating tex mem */
 197       *mapOut = NULL;
 198       return;
 199    }
 200
 201    map = swImage->Buffer;
 202
 203    if (texImage->TexObject->Target == GL_TEXTURE_3D ||
 204        texImage->TexObject->Target == GL_TEXTURE_2D_ARRAY) {
 205       GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
 206                                                  texImage->Width,
 207                                                  texImage->Height,
 208                                                  1);
 209       assert(slice < texImage->Depth);
 210       map += slice * sliceSize;
 211    } else if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
 212       GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
 213                                                  texImage->Width,
 214                                                  1,
 215                                                  1);
 216       assert(slice < texImage->Height);
 217       map += slice * sliceSize;
 218    }
 219
 220    /* apply x/y offset to map address */
 221    map += stride * (y / bh) + texelSize * (x / bw);
 222
 223    *mapOut = map;
 224    *rowStrideOut = stride;
 225 }
 226
 227 void
 228 _swrast_unmap_teximage(struct gl_context *ctx,
 229                        struct gl_texture_image *texImage,
 230                        GLuint slice)
 231 {
 232    /* nop */
 233 }
 234
 235
 236 void
 237 _swrast_map_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
 238 {
 239    const GLuint faces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
 240    GLuint face, level;
 241
 242    for (face = 0; face < faces; face++) {
 243       for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
 244          struct gl_texture_image *texImage = texObj->Image[face][level];
 245          if (texImage) {
 246             struct swrast_texture_image *swImage =
 247                swrast_texture_image(texImage);
 248
 249             /* XXX we'll eventually call _swrast_map_teximage() here */
 250             swImage->Data = swImage->Buffer;
 251          }
 252       }
 253    }
 254 }
 255
 256
 257 void
 258 _swrast_unmap_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
 259 {
 260    const GLuint faces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
 261    GLuint face, level;
 262
 263    for (face = 0; face < faces; face++) {
 264       for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
 265          struct gl_texture_image *texImage = texObj->Image[face][level];
 266          if (texImage) {
 267             struct swrast_texture_image *swImage
 268                = swrast_texture_image(texImage);
 269
 270             /* XXX we'll eventually call _swrast_unmap_teximage() here */
 271             swImage->Data = NULL;
 272          }
 273       }
 274    }
 275 }
 276
 277
 278 /**
 279  * Map all textures for reading prior to software rendering.
 280  */
 281 void
 282 _swrast_map_textures(struct gl_context *ctx)
 283 {
 284    GLbitfield enabledUnits = ctx->Texture._EnabledUnits;
 285
 286    /* loop over enabled texture units */
 287    while (enabledUnits) {
 288       GLuint unit = _mesa_ffs(enabledUnits) - 1;
 289       struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 290
 291       _swrast_map_texture(ctx, texObj);
 292
 293       enabledUnits &= ~(1 << unit);
 294    }
 295 }
 296
 297
 298 /**
 299  * Unmap all textures for reading prior to software rendering.
 300  */
 301 void
 302 _swrast_unmap_textures(struct gl_context *ctx)
 303 {
 304    GLbitfield enabledUnits = ctx->Texture._EnabledUnits;
 305
 306    /* loop over enabled texture units */
 307    while (enabledUnits) {
 308       GLuint unit = _mesa_ffs(enabledUnits) - 1;
 309       struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 310
 311       _swrast_unmap_texture(ctx, texObj);
 312
 313       enabledUnits &= ~(1 << unit);
 314    }
 315 }
 316
 317
 318 /**
 319  * Map or unmap any textures that we may be rendering to as renderbuffers.
 320  */
 321 static void
 322 map_unmap_renderbuffers(struct gl_context *ctx,
 323                         struct gl_framebuffer *fb,
 324                         GLboolean map)
 325 {
 326    GLuint i;
 327
 328    for (i = 0; i < Elements(fb->Attachment); i++) {
 329       struct gl_texture_object *texObj = fb->Attachment[i].Texture;
 330       if (texObj) {
 331          const GLuint level = fb->Attachment[i].TextureLevel;
 332          const GLuint face = fb->Attachment[i].CubeMapFace;
 333          struct gl_texture_image *texImage = texObj->Image[face][level];
 334          if (texImage) {
 335             struct swrast_texture_image *swImage
 336                = swrast_texture_image(texImage);
 337
 338             if (map) {
 339                /* XXX we'll eventually call _swrast_map_teximage() here */
 340                swImage->Data = swImage->Buffer;
 341             }
 342             else {
 343                /* XXX we'll eventually call _swrast_unmap_teximage() here */
 344                swImage->Data = NULL;
 345             }
 346          }
 347       }
 348    }
 349 }
 350
 351
 352 void
 353 _swrast_map_renderbuffers(struct gl_context *ctx)
 354 {
 355    map_unmap_renderbuffers(ctx, ctx->DrawBuffer, GL_TRUE);
 356    if (ctx->ReadBuffer != ctx->DrawBuffer)
 357       map_unmap_renderbuffers(ctx, ctx->ReadBuffer, GL_TRUE);
 358 }
 359
 360
 361 void
 362 _swrast_unmap_renderbuffers(struct gl_context *ctx)
 363 {
 364    map_unmap_renderbuffers(ctx, ctx->DrawBuffer, GL_FALSE);
 365    if (ctx->ReadBuffer != ctx->DrawBuffer)
 366       map_unmap_renderbuffers(ctx, ctx->ReadBuffer, GL_FALSE);
 367 }
 368
 369
 370
 371 /**
 372  * Called via ctx->Driver.AllocTextureStorage()
 373  * Just have to allocate memory for the texture images.
 374  */
 375 GLboolean
 376 _swrast_AllocTextureStorage(struct gl_context *ctx,
 377                             struct gl_texture_object *texObj,
 378                             GLsizei levels, GLsizei width,
 379                             GLsizei height, GLsizei depth)
 380 {
 381    const GLint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 382    GLint face, level;
 383
 384    for (face = 0; face < numFaces; face++) {
 385       for (level = 0; level < levels; level++) {
 386          struct gl_texture_image *texImage = texObj->Image[face][level];
 387          if (!_swrast_alloc_texture_image_buffer(ctx, texImage,
 388                                                  texImage->TexFormat,
 389                                                  texImage->Width,
 390                                                  texImage->Height,
 391                                                  texImage->Depth)) {
 392             return GL_FALSE;
 393          }
 394       }
 395    }
 396
 397    return GL_TRUE;
 398 }
 399