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