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/macros.h"
  39 #include "main/mipmap.h"
  40 #include "main/teximage.h"
  41 #include "main/texobj.h"
  42 #include "main/texparam.h"
  43 #include "main/varray.h"
  44 #include "main/viewport.h"
  45 #include "drivers/common/meta.h"
  46
  47 /**
  48  * Bind a particular texture level/layer to mipmap->FBO's GL_COLOR_ATTACHMENT0.
  49  */
  50 static void
  51 bind_fbo_image(struct gl_texture_object *texObj, GLenum target,
  52                GLuint level, GLuint layer)
  53 {
  54    switch (target) {
  55    case GL_TEXTURE_1D:
  56       _mesa_FramebufferTexture1D(GL_FRAMEBUFFER,
  57                                  GL_COLOR_ATTACHMENT0,
  58                                  target,
  59                                  texObj->Name,
  60                                  level);
  61       break;
  62    case GL_TEXTURE_1D_ARRAY:
  63    case GL_TEXTURE_2D_ARRAY:
  64    case GL_TEXTURE_3D:
  65       _mesa_FramebufferTextureLayer(GL_FRAMEBUFFER,
  66                                     GL_COLOR_ATTACHMENT0,
  67                                     texObj->Name,
  68                                     level,
  69                                     layer);
  70       break;
  71    default: /* 2D / cube */
  72       _mesa_FramebufferTexture2D(GL_FRAMEBUFFER,
  73                                  GL_COLOR_ATTACHMENT0,
  74                                  target,
  75                                  texObj->Name,
  76                                  level);
  77    }
  78 }
  79
  80 /**
  81  * Check if the call to _mesa_meta_GenerateMipmap() will require a
  82  * software fallback.  The fallback path will require that the texture
  83  * images are mapped.
  84  * \return GL_TRUE if a fallback is needed, GL_FALSE otherwise
  85  */
  86 static bool
  87 fallback_required(struct gl_context *ctx, GLenum target,
  88                   struct gl_texture_object *texObj)
  89 {
  90    const GLuint fboSave = ctx->DrawBuffer->Name;
  91    struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
  92    struct gl_texture_image *baseImage;
  93    GLuint srcLevel;
  94    GLenum status;
  95
  96    /* check for fallbacks */
  97    if (target == GL_TEXTURE_3D) {
  98       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
  99                        "glGenerateMipmap() to %s target\n",
 100                        _mesa_lookup_enum_by_nr(target));
 101       return true;
 102    }
 103
 104    srcLevel = texObj->BaseLevel;
 105    baseImage = _mesa_select_tex_image(ctx, texObj, target, srcLevel);
 106    if (!baseImage) {
 107       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
 108                        "glGenerateMipmap() couldn't find base teximage\n");
 109       return true;
 110    }
 111
 112    if (_mesa_is_format_compressed(baseImage->TexFormat)) {
 113       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
 114                        "glGenerateMipmap() with %s format\n",
 115                        _mesa_get_format_name(baseImage->TexFormat));
 116       return true;
 117    }
 118
 119    if (_mesa_get_format_color_encoding(baseImage->TexFormat) == GL_SRGB &&
 120        !ctx->Extensions.EXT_texture_sRGB_decode) {
 121       /* The texture format is sRGB but we can't turn off sRGB->linear
 122        * texture sample conversion.  So we won't be able to generate the
 123        * right colors when rendering.  Need to use a fallback.
 124        */
 125       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
 126                        "glGenerateMipmap() of sRGB texture without "
 127                        "sRGB decode\n");
 128       return true;
 129    }
 130
 131    /*
 132     * Test that we can actually render in the texture's format.
 133     */
 134    if (!mipmap->FBO)
 135       _mesa_GenFramebuffers(1, &mipmap->FBO);
 136    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, mipmap->FBO);
 137
 138    bind_fbo_image(texObj, target, srcLevel, 0);
 139
 140    status = _mesa_CheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
 141
 142    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, fboSave);
 143
 144    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 145       _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
 146                        "glGenerateMipmap() got incomplete FBO\n");
 147       return true;
 148    }
 149
 150    return false;
 151 }
 152
 153 void
 154 _mesa_meta_glsl_generate_mipmap_cleanup(struct gen_mipmap_state *mipmap)
 155 {
 156    if (mipmap->VAO == 0)
 157       return;
 158    _mesa_DeleteVertexArrays(1, &mipmap->VAO);
 159    mipmap->VAO = 0;
 160    _mesa_DeleteBuffers(1, &mipmap->VBO);
 161    mipmap->VBO = 0;
 162
 163    _mesa_meta_blit_shader_table_cleanup(&mipmap->shaders);
 164 }
 165
 166 static GLboolean
 167 prepare_mipmap_level(struct gl_context *ctx,
 168                      struct gl_texture_object *texObj, GLuint level,
 169                      GLsizei width, GLsizei height, GLsizei depth,
 170                      GLenum intFormat, mesa_format format)
 171 {
 172    if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
 173       /* Work around Mesa expecting the number of array slices in "height". */
 174       height = depth;
 175       depth = 1;
 176    }
 177
 178    return _mesa_prepare_mipmap_level(ctx, texObj, level, width, height, depth,
 179                                      0, intFormat, format);
 180 }
 181
 182 /**
 183  * Called via ctx->Driver.GenerateMipmap()
 184  * Note: We don't yet support 3D textures, 1D/2D array textures or texture
 185  * borders.
 186  */
 187 void
 188 _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
 189                           struct gl_texture_object *texObj)
 190 {
 191    struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
 192    struct vertex verts[4];
 193    const GLuint baseLevel = texObj->BaseLevel;
 194    const GLuint maxLevel = texObj->MaxLevel;
 195    const GLint maxLevelSave = texObj->MaxLevel;
 196    const GLboolean genMipmapSave = texObj->GenerateMipmap;
 197    const GLuint fboSave = ctx->DrawBuffer->Name;
 198    const GLuint currentTexUnitSave = ctx->Texture.CurrentUnit;
 199    const GLboolean use_glsl_version = ctx->Extensions.ARB_vertex_shader &&
 200                                       ctx->Extensions.ARB_fragment_shader;
 201    GLenum faceTarget;
 202    GLuint dstLevel;
 203    GLuint samplerSave;
 204
 205    if (fallback_required(ctx, target, texObj)) {
 206       _mesa_generate_mipmap(ctx, target, texObj);
 207       return;
 208    }
 209
 210    if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
 211        target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
 212       faceTarget = target;
 213       target = GL_TEXTURE_CUBE_MAP;
 214    } else {
 215       faceTarget = target;
 216    }
 217
 218    _mesa_meta_begin(ctx, MESA_META_ALL);
 219
 220    /* Choose between glsl version and fixed function version of
 221     * GenerateMipmap function.
 222     */
 223    if (use_glsl_version) {
 224       _mesa_meta_setup_vertex_objects(&mipmap->VAO, &mipmap->VBO, true,
 225                                       2, 3, 0);
 226       _mesa_meta_setup_blit_shader(ctx, target, &mipmap->shaders);
 227    } else {
 228       _mesa_meta_setup_ff_tnl_for_blit(&mipmap->VAO, &mipmap->VBO, 3);
 229       _mesa_set_enable(ctx, target, GL_TRUE);
 230    }
 231
 232    samplerSave = ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler ?
 233       ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler->Name : 0;
 234
 235    if (currentTexUnitSave != 0)
 236       _mesa_BindTexture(target, texObj->Name);
 237
 238    if (!mipmap->Sampler) {
 239       _mesa_GenSamplers(1, &mipmap->Sampler);
 240       _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
 241
 242       _mesa_SamplerParameteri(mipmap->Sampler,
 243                               GL_TEXTURE_MIN_FILTER,
 244                               GL_LINEAR_MIPMAP_LINEAR);
 245       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 246       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 247       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 248       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 249
 250       /* We don't want to encode or decode sRGB values; treat them as linear.
 251        * This is not technically correct for GLES3 but we don't get any API
 252        * error at the moment.
 253        */
 254       if (ctx->Extensions.EXT_texture_sRGB_decode) {
 255          _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_SRGB_DECODE_EXT,
 256                GL_SKIP_DECODE_EXT);
 257       }
 258    } else {
 259       _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
 260    }
 261
 262    assert(mipmap->FBO != 0);
 263    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, mipmap->FBO);
 264
 265    _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, GL_FALSE);
 266
 267    /* Silence valgrind warnings about reading uninitialized stack. */
 268    memset(verts, 0, sizeof(verts));
 269
 270    /* setup vertex positions */
 271    verts[0].x = -1.0F;
 272    verts[0].y = -1.0F;
 273    verts[1].x =  1.0F;
 274    verts[1].y = -1.0F;
 275    verts[2].x =  1.0F;
 276    verts[2].y =  1.0F;
 277    verts[3].x = -1.0F;
 278    verts[3].y =  1.0F;
 279
 280    /* texture is already locked, unlock now */
 281    _mesa_unlock_texture(ctx, texObj);
 282
 283    for (dstLevel = baseLevel + 1; dstLevel <= maxLevel; dstLevel++) {
 284       const struct gl_texture_image *srcImage;
 285       const GLuint srcLevel = dstLevel - 1;
 286       GLuint layer;
 287       GLsizei srcWidth, srcHeight, srcDepth;
 288       GLsizei dstWidth, dstHeight, dstDepth;
 289
 290       srcImage = _mesa_select_tex_image(ctx, texObj, faceTarget, srcLevel);
 291       assert(srcImage->Border == 0);
 292
 293       /* src size */
 294       srcWidth = srcImage->Width;
 295       if (target == GL_TEXTURE_1D_ARRAY) {
 296          srcHeight = 1;
 297          srcDepth = srcImage->Height;
 298       } else {
 299          srcHeight = srcImage->Height;
 300          srcDepth = srcImage->Depth;
 301       }
 302
 303       /* new dst size */
 304       dstWidth = minify(srcWidth, 1);
 305       dstHeight = minify(srcHeight, 1);
 306       dstDepth = target == GL_TEXTURE_3D ? minify(srcDepth, 1) : srcDepth;
 307
 308       if (dstWidth == srcWidth &&
 309           dstHeight == srcHeight &&
 310           dstDepth == srcDepth) {
 311          /* all done */
 312          break;
 313       }
 314
 315       /* Allocate storage for the destination mipmap image(s) */
 316
 317       /* Set MaxLevel large enough to hold the new level when we allocate it */
 318       _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, dstLevel);
 319
 320       if (!prepare_mipmap_level(ctx, texObj, dstLevel,
 321                                 dstWidth, dstHeight, dstDepth,
 322                                 srcImage->InternalFormat,
 323                                 srcImage->TexFormat)) {
 324          /* All done.  We either ran out of memory or we would go beyond the
 325           * last valid level of an immutable texture if we continued.
 326           */
 327          break;
 328       }
 329
 330       /* limit minification to src level */
 331       _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, srcLevel);
 332
 333       /* setup viewport */
 334       _mesa_set_viewport(ctx, 0, 0, 0, dstWidth, dstHeight);
 335       _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0);
 336
 337       for (layer = 0; layer < dstDepth; ++layer) {
 338          /* Setup texture coordinates */
 339          _mesa_meta_setup_texture_coords(faceTarget,
 340                                          layer,
 341                                          0, 0, 1, /* width, height never used here */
 342                                          verts[0].tex,
 343                                          verts[1].tex,
 344                                          verts[2].tex,
 345                                          verts[3].tex);
 346
 347          /* upload vertex data */
 348          _mesa_BufferData(GL_ARRAY_BUFFER_ARB, sizeof(verts),
 349                           verts, GL_DYNAMIC_DRAW_ARB);
 350
 351          bind_fbo_image(texObj, faceTarget, dstLevel, layer);
 352
 353          /* sanity check */
 354          if (_mesa_CheckFramebufferStatus(GL_FRAMEBUFFER) !=
 355              GL_FRAMEBUFFER_COMPLETE) {
 356             _mesa_problem(ctx, "Unexpected incomplete framebuffer in "
 357                           "_mesa_meta_GenerateMipmap()");
 358             break;
 359          }
 360
 361          assert(dstWidth == ctx->DrawBuffer->Width);
 362          if (target == GL_TEXTURE_1D_ARRAY) {
 363             assert(dstHeight == 1);
 364          } else {
 365             assert(dstHeight == ctx->DrawBuffer->Height);
 366          }
 367
 368          _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 369       }
 370    }
 371
 372    _mesa_lock_texture(ctx, texObj); /* relock */
 373
 374    _mesa_BindSampler(ctx->Texture.CurrentUnit, samplerSave);
 375
 376    _mesa_meta_end(ctx);
 377
 378    _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevelSave);
 379    if (genMipmapSave)
 380       _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, genMipmapSave);
 381
 382    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, fboSave);
 383 }