src/mesa/drivers/common/meta_generate_mipmap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * Meta operations.  Some GL operations can be expressed in terms of
  27  * other GL operations.  For example, glBlitFramebuffer() can be done
  28  * with texture mapping and glClear() can be done with polygon rendering.
  29  *
  30  * \author Brian Paul
  31  */
  32
  33 #include "main/arrayobj.h"
  34 #include "main/buffers.h"
  35 #include "main/enums.h"
  36 #include "main/enable.h"
  37 #include "main/fbobject.h"
  38 #include "main/framebuffer.h"
  39 #include "main/macros.h"
  40 #include "main/mipmap.h"
  41 #include "main/teximage.h"
  42 #include "main/texobj.h"
  43 #include "main/texparam.h"
  44 #include "main/varray.h"
  45 #include "main/viewport.h"
  46 #include "drivers/common/meta.h"
  47 #include "program/prog_instruction.h"
  48
  49
  50 /**
  51  * Check if the call to _mesa_meta_GenerateMipmap() will require a
  52  * software fallback.  The fallback path will require that the texture
  53  * images are mapped.
  54  * \return GL_TRUE if a fallback is needed, GL_FALSE otherwise
  55  */
  56 static bool
  57 fallback_required(struct gl_context *ctx, GLenum target,
  58                   struct gl_texture_object *texObj)
  59 {
  60    struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
  61    struct gl_texture_image *baseImage;
  62    GLuint srcLevel;
  63    GLenum status;
  64
  65    /* check for fallbacks */
  66    if (target == GL_TEXTURE_3D) {
  67       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
  68                        "glGenerateMipmap() to %s target\n",
  69                        _mesa_enum_to_string(target));
  70       return true;
  71    }
  72
  73    srcLevel = texObj->BaseLevel;
  74    baseImage = _mesa_select_tex_image(texObj, target, srcLevel);
  75    if (!baseImage) {
  76       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
  77                        "glGenerateMipmap() couldn't find base teximage\n");
  78       return true;
  79    }
  80
  81    if (_mesa_is_format_compressed(baseImage->TexFormat)) {
  82       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
  83                        "glGenerateMipmap() with %s format\n",
  84                        _mesa_get_format_name(baseImage->TexFormat));
  85       return true;
  86    }
  87
  88    if (_mesa_get_format_color_encoding(baseImage->TexFormat) == GL_SRGB &&
  89        !ctx->Extensions.EXT_texture_sRGB_decode) {
  90       /* The texture format is sRGB but we can't turn off sRGB->linear
  91        * texture sample conversion.  So we won't be able to generate the
  92        * right colors when rendering.  Need to use a fallback.
  93        */
  94       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
  95                        "glGenerateMipmap() of sRGB texture without "
  96                        "sRGB decode\n");
  97       return true;
  98    }
  99
 100    /*
 101     * Test that we can actually render in the texture's format.
 102     */
 103    if (mipmap->fb == NULL) {
 104       mipmap->fb = ctx->Driver.NewFramebuffer(ctx, 0xDEADBEEF);
 105       if (mipmap->fb == NULL) {
 106          _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
 107                           "glGenerateMipmap() ran out of memory\n");
 108          return true;
 109       }
 110    }
 111
 112    _mesa_meta_framebuffer_texture_image(ctx, mipmap->fb,
 113                                         GL_COLOR_ATTACHMENT0, baseImage, 0);
 114
 115    status = _mesa_check_framebuffer_status(ctx, mipmap->fb);
 116    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 117       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
 118                        "glGenerateMipmap() got incomplete FBO\n");
 119       return true;
 120    }
 121
 122    return false;
 123 }
 124
 125 void
 126 _mesa_meta_glsl_generate_mipmap_cleanup(struct gl_context *ctx,
 127                                         struct gen_mipmap_state *mipmap)
 128 {
 129    if (mipmap->VAO == 0)
 130       return;
 131    _mesa_DeleteVertexArrays(1, &mipmap->VAO);
 132    mipmap->VAO = 0;
 133    _mesa_reference_buffer_object(ctx, &mipmap->buf_obj, NULL);
 134    _mesa_reference_sampler_object(ctx, &mipmap->samp_obj, NULL);
 135    _mesa_reference_framebuffer(&mipmap->fb, NULL);
 136
 137    _mesa_meta_blit_shader_table_cleanup(ctx, &mipmap->shaders);
 138 }
 139
 140
 141 /**
 142  * Called via ctx->Driver.GenerateMipmap()
 143  * Note: We don't yet support 3D textures, or texture borders.
 144  */
 145 void
 146 _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
 147                           struct gl_texture_object *texObj)
 148 {
 149    struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
 150    struct vertex verts[4];
 151    const GLuint baseLevel = texObj->BaseLevel;
 152    const GLuint maxLevel = texObj->MaxLevel;
 153    const GLint maxLevelSave = texObj->MaxLevel;
 154    const GLboolean genMipmapSave = texObj->GenerateMipmap;
 155    const GLboolean use_glsl_version = ctx->Extensions.ARB_vertex_shader &&
 156                                       ctx->Extensions.ARB_fragment_shader;
 157    GLenum faceTarget;
 158    GLuint dstLevel;
 159    struct gl_sampler_object *samp_obj_save = NULL;
 160    GLint swizzle[4];
 161    GLboolean swizzleSaved = GL_FALSE;
 162
 163    /* GLint so the compiler won't complain about type signedness mismatch in
 164     * the calls to _mesa_texture_parameteriv below.
 165     */
 166    static const GLint always_false = GL_FALSE;
 167    static const GLint always_true = GL_TRUE;
 168
 169    if (fallback_required(ctx, target, texObj)) {
 170       _mesa_generate_mipmap(ctx, target, texObj);
 171       return;
 172    }
 173
 174    if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
 175        target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
 176       faceTarget = target;
 177       target = GL_TEXTURE_CUBE_MAP;
 178    } else {
 179       faceTarget = target;
 180    }
 181
 182    _mesa_meta_begin(ctx, MESA_META_ALL & ~MESA_META_DRAW_BUFFERS);
 183
 184    /* Choose between glsl version and fixed function version of
 185     * GenerateMipmap function.
 186     */
 187    if (use_glsl_version) {
 188       _mesa_meta_setup_vertex_objects(ctx, &mipmap->VAO, &mipmap->buf_obj, true,
 189                                       2, 4, 0);
 190       _mesa_meta_setup_blit_shader(ctx, target, false, &mipmap->shaders);
 191    } else {
 192       _mesa_meta_setup_ff_tnl_for_blit(ctx, &mipmap->VAO, &mipmap->buf_obj, 3);
 193       _mesa_set_enable(ctx, target, GL_TRUE);
 194    }
 195
 196    _mesa_reference_sampler_object(ctx, &samp_obj_save,
 197                                   ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler);
 198
 199    /* We may have been called from glGenerateTextureMipmap with CurrentUnit
 200     * still set to 0, so we don't know when we can skip binding the texture.
 201     * Assume that _mesa_BindTexture will be fast if we're rebinding the same
 202     * texture.
 203     */
 204    _mesa_BindTexture(target, texObj->Name);
 205
 206    if (mipmap->samp_obj == NULL) {
 207       mipmap->samp_obj =  ctx->Driver.NewSamplerObject(ctx, 0xDEADBEEF);
 208       if (mipmap->samp_obj == NULL) {
 209          /* This is a bit lazy.  Flag out of memory, and then don't bother to
 210           * clean up.  Once out of memory is flagged, the only realistic next
 211           * move is to destroy the context.  That will trigger all the right
 212           * clean up.
 213           */
 214          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenerateMipmap");
 215          return;
 216       }
 217
 218       _mesa_set_sampler_filters(ctx, mipmap->samp_obj, GL_LINEAR_MIPMAP_LINEAR,
 219                                 GL_LINEAR);
 220       _mesa_set_sampler_wrap(ctx, mipmap->samp_obj, GL_CLAMP_TO_EDGE,
 221                              GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
 222
 223       /* We don't want to encode or decode sRGB values; treat them as linear. */
 224       _mesa_set_sampler_srgb_decode(ctx, mipmap->samp_obj, GL_SKIP_DECODE_EXT);
 225    }
 226
 227    _mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, mipmap->samp_obj);
 228
 229    assert(mipmap->fb != NULL);
 230    _mesa_bind_framebuffers(ctx, mipmap->fb, mipmap->fb);
 231
 232    _mesa_texture_parameteriv(ctx, texObj, GL_GENERATE_MIPMAP, &always_false, false);
 233
 234    if (texObj->_Swizzle != SWIZZLE_NOOP) {
 235       static const GLint swizzleNoop[4] = { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA };
 236       memcpy(swizzle, texObj->Swizzle, sizeof(swizzle));
 237       swizzleSaved = GL_TRUE;
 238       _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_SWIZZLE_RGBA,
 239                                 swizzleNoop, false);
 240    }
 241
 242    /* Silence valgrind warnings about reading uninitialized stack. */
 243    memset(verts, 0, sizeof(verts));
 244
 245    /* setup vertex positions */
 246    verts[0].x = -1.0F;
 247    verts[0].y = -1.0F;
 248    verts[1].x =  1.0F;
 249    verts[1].y = -1.0F;
 250    verts[2].x =  1.0F;
 251    verts[2].y =  1.0F;
 252    verts[3].x = -1.0F;
 253    verts[3].y =  1.0F;
 254
 255    /* texture is already locked, unlock now */
 256    _mesa_unlock_texture(ctx, texObj);
 257
 258    _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, maxLevel);
 259
 260    for (dstLevel = baseLevel + 1; dstLevel <= maxLevel; dstLevel++) {
 261       const struct gl_texture_image *srcImage;
 262       struct gl_texture_image *dstImage;
 263       const GLuint srcLevel = dstLevel - 1;
 264       GLuint layer;
 265       GLsizei srcWidth, srcHeight, srcDepth;
 266       GLsizei dstWidth, dstHeight, dstDepth;
 267
 268       srcImage = _mesa_select_tex_image(texObj, faceTarget, srcLevel);
 269       assert(srcImage->Border == 0);
 270
 271       /* src size */
 272       srcWidth = srcImage->Width;
 273       if (target == GL_TEXTURE_1D_ARRAY) {
 274          srcHeight = 1;
 275          srcDepth = srcImage->Height;
 276       } else {
 277          srcHeight = srcImage->Height;
 278          srcDepth = srcImage->Depth;
 279       }
 280
 281       /* new dst size */
 282       dstWidth = minify(srcWidth, 1);
 283       dstHeight = minify(srcHeight, 1);
 284       dstDepth = target == GL_TEXTURE_3D ? minify(srcDepth, 1) : srcDepth;
 285
 286       if (dstWidth == srcWidth &&
 287           dstHeight == srcHeight &&
 288           dstDepth == srcDepth) {
 289          /* all done */
 290          break;
 291       }
 292
 293       /* Allocate storage for the destination mipmap image(s) */
 294
 295       /* Set MaxLevel large enough to hold the new level when we allocate it */
 296       _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_MAX_LEVEL,
 297                                 (GLint *) &dstLevel, false);
 298
 299       dstImage = _mesa_select_tex_image(texObj, faceTarget, dstLevel);
 300
 301       /* All done.  We either ran out of memory or we would go beyond the last
 302        * valid level of an immutable texture if we continued.
 303        */
 304       if (dstImage == NULL)
 305          break;
 306
 307       /* limit minification to src level */
 308       _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_MAX_LEVEL,
 309                                 (GLint *) &srcLevel, false);
 310
 311       /* setup viewport */
 312       _mesa_set_viewport(ctx, 0, 0, 0, dstWidth, dstHeight);
 313       _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0);
 314
 315       for (layer = 0; layer < dstDepth; ++layer) {
 316          /* Setup texture coordinates */
 317          _mesa_meta_setup_texture_coords(faceTarget,
 318                                          layer,
 319                                          0, 0, /* xoffset, yoffset */
 320                                          srcWidth, srcHeight, /* img size */
 321                                          srcWidth, srcHeight, srcDepth,
 322                                          verts[0].tex,
 323                                          verts[1].tex,
 324                                          verts[2].tex,
 325                                          verts[3].tex);
 326
 327          /* upload vertex data */
 328          _mesa_buffer_data(ctx, mipmap->buf_obj, GL_NONE, sizeof(verts), verts,
 329                            GL_DYNAMIC_DRAW, __func__);
 330
 331          _mesa_meta_framebuffer_texture_image(ctx, ctx->DrawBuffer,
 332                                               GL_COLOR_ATTACHMENT0, dstImage,
 333                                               layer);
 334
 335          /* sanity check */
 336          if (_mesa_check_framebuffer_status(ctx, ctx->DrawBuffer) !=
 337              GL_FRAMEBUFFER_COMPLETE) {
 338             _mesa_problem(ctx, "Unexpected incomplete framebuffer in "
 339                           "_mesa_meta_GenerateMipmap()");
 340             break;
 341          }
 342
 343          assert(dstWidth == ctx->DrawBuffer->Width);
 344          if (target == GL_TEXTURE_1D_ARRAY) {
 345             assert(dstHeight == 1);
 346          } else {
 347             assert(dstHeight == ctx->DrawBuffer->Height);
 348          }
 349
 350          _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 351       }
 352    }
 353
 354    _mesa_lock_texture(ctx, texObj); /* relock */
 355
 356    _mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, samp_obj_save);
 357    _mesa_reference_sampler_object(ctx, &samp_obj_save, NULL);
 358
 359    _mesa_meta_end(ctx);
 360
 361    _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_MAX_LEVEL, &maxLevelSave,
 362                              false);
 363    if (genMipmapSave)
 364       _mesa_texture_parameteriv(ctx, texObj, GL_GENERATE_MIPMAP, &always_true,
 365                                 false);
 366    if (swizzleSaved)
 367       _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_SWIZZLE_RGBA, swizzle,
 368                                 false);
 369 }