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_DeleteSamplers(1, &mipmap->Sampler);
 141    mipmap->Sampler = 0;
 142
 143    if (mipmap->FBO != 0) {
 144       _mesa_DeleteFramebuffers(1, &mipmap->FBO);
 145       mipmap->FBO = 0;
 146    }
 147
 148    _mesa_meta_blit_shader_table_cleanup(&mipmap->shaders);
 149 }
 150
 151 static GLboolean
 152 prepare_mipmap_level(struct gl_context *ctx,
 153                      struct gl_texture_object *texObj, GLuint level,
 154                      GLsizei width, GLsizei height, GLsizei depth,
 155                      GLenum intFormat, mesa_format format)
 156 {
 157    if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
 158       /* Work around Mesa expecting the number of array slices in "height". */
 159       height = depth;
 160       depth = 1;
 161    }
 162
 163    return _mesa_prepare_mipmap_level(ctx, texObj, level, width, height, depth,
 164                                      0, intFormat, format);
 165 }
 166
 167 /**
 168  * Called via ctx->Driver.GenerateMipmap()
 169  * Note: We don't yet support 3D textures, or texture borders.
 170  */
 171 void
 172 _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
 173                           struct gl_texture_object *texObj)
 174 {
 175    struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
 176    struct vertex verts[4];
 177    const GLuint baseLevel = texObj->BaseLevel;
 178    const GLuint maxLevel = texObj->MaxLevel;
 179    const GLint maxLevelSave = texObj->MaxLevel;
 180    const GLboolean genMipmapSave = texObj->GenerateMipmap;
 181    const GLboolean use_glsl_version = ctx->Extensions.ARB_vertex_shader &&
 182                                       ctx->Extensions.ARB_fragment_shader;
 183    GLenum faceTarget;
 184    GLuint dstLevel;
 185    GLuint samplerSave;
 186    GLint swizzle[4];
 187    GLboolean swizzleSaved = GL_FALSE;
 188
 189    if (fallback_required(ctx, target, texObj)) {
 190       _mesa_generate_mipmap(ctx, target, texObj);
 191       return;
 192    }
 193
 194    if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
 195        target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
 196       faceTarget = target;
 197       target = GL_TEXTURE_CUBE_MAP;
 198    } else {
 199       faceTarget = target;
 200    }
 201
 202    _mesa_meta_begin(ctx, MESA_META_ALL & ~MESA_META_DRAW_BUFFERS);
 203
 204    /* Choose between glsl version and fixed function version of
 205     * GenerateMipmap function.
 206     */
 207    if (use_glsl_version) {
 208       _mesa_meta_setup_vertex_objects(ctx, &mipmap->VAO, &mipmap->buf_obj, true,
 209                                       2, 4, 0);
 210       _mesa_meta_setup_blit_shader(ctx, target, false, &mipmap->shaders);
 211    } else {
 212       _mesa_meta_setup_ff_tnl_for_blit(ctx, &mipmap->VAO, &mipmap->buf_obj, 3);
 213       _mesa_set_enable(ctx, target, GL_TRUE);
 214    }
 215
 216    samplerSave = ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler ?
 217       ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler->Name : 0;
 218
 219    /* We may have been called from glGenerateTextureMipmap with CurrentUnit
 220     * still set to 0, so we don't know when we can skip binding the texture.
 221     * Assume that _mesa_BindTexture will be fast if we're rebinding the same
 222     * texture.
 223     */
 224    _mesa_BindTexture(target, texObj->Name);
 225
 226    if (!mipmap->Sampler) {
 227       _mesa_GenSamplers(1, &mipmap->Sampler);
 228       _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
 229
 230       _mesa_SamplerParameteri(mipmap->Sampler,
 231                               GL_TEXTURE_MIN_FILTER,
 232                               GL_LINEAR_MIPMAP_LINEAR);
 233       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 234       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 235       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 236       _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 237
 238       /* We don't want to encode or decode sRGB values; treat them as linear.
 239        * This is not technically correct for GLES3 but we don't get any API
 240        * error at the moment.
 241        */
 242       if (ctx->Extensions.EXT_texture_sRGB_decode) {
 243          _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_SRGB_DECODE_EXT,
 244                GL_SKIP_DECODE_EXT);
 245       }
 246    } else {
 247       _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
 248    }
 249
 250    assert(mipmap->FBO != 0);
 251    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, mipmap->FBO);
 252
 253    _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, GL_FALSE);
 254
 255    if (texObj->_Swizzle != SWIZZLE_NOOP) {
 256       static const GLint swizzleNoop[4] = { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA };
 257       memcpy(swizzle, texObj->Swizzle, sizeof(swizzle));
 258       swizzleSaved = GL_TRUE;
 259       _mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzleNoop);
 260    }
 261
 262    /* Silence valgrind warnings about reading uninitialized stack. */
 263    memset(verts, 0, sizeof(verts));
 264
 265    /* setup vertex positions */
 266    verts[0].x = -1.0F;
 267    verts[0].y = -1.0F;
 268    verts[1].x =  1.0F;
 269    verts[1].y = -1.0F;
 270    verts[2].x =  1.0F;
 271    verts[2].y =  1.0F;
 272    verts[3].x = -1.0F;
 273    verts[3].y =  1.0F;
 274
 275    /* texture is already locked, unlock now */
 276    _mesa_unlock_texture(ctx, texObj);
 277
 278    for (dstLevel = baseLevel + 1; dstLevel <= maxLevel; dstLevel++) {
 279       const struct gl_texture_image *srcImage;
 280       struct gl_texture_image *dstImage;
 281       const GLuint srcLevel = dstLevel - 1;
 282       GLuint layer;
 283       GLsizei srcWidth, srcHeight, srcDepth;
 284       GLsizei dstWidth, dstHeight, dstDepth;
 285
 286       srcImage = _mesa_select_tex_image(texObj, faceTarget, srcLevel);
 287       assert(srcImage->Border == 0);
 288
 289       /* src size */
 290       srcWidth = srcImage->Width;
 291       if (target == GL_TEXTURE_1D_ARRAY) {
 292          srcHeight = 1;
 293          srcDepth = srcImage->Height;
 294       } else {
 295          srcHeight = srcImage->Height;
 296          srcDepth = srcImage->Depth;
 297       }
 298
 299       /* new dst size */
 300       dstWidth = minify(srcWidth, 1);
 301       dstHeight = minify(srcHeight, 1);
 302       dstDepth = target == GL_TEXTURE_3D ? minify(srcDepth, 1) : srcDepth;
 303
 304       if (dstWidth == srcWidth &&
 305           dstHeight == srcHeight &&
 306           dstDepth == srcDepth) {
 307          /* all done */
 308          break;
 309       }
 310
 311       /* Allocate storage for the destination mipmap image(s) */
 312
 313       /* Set MaxLevel large enough to hold the new level when we allocate it */
 314       _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, dstLevel);
 315
 316       if (!prepare_mipmap_level(ctx, texObj, dstLevel,
 317                                 dstWidth, dstHeight, dstDepth,
 318                                 srcImage->InternalFormat,
 319                                 srcImage->TexFormat)) {
 320          /* All done.  We either ran out of memory or we would go beyond the
 321           * last valid level of an immutable texture if we continued.
 322           */
 323          break;
 324       }
 325       dstImage = _mesa_select_tex_image(texObj, faceTarget, dstLevel);
 326
 327       /* limit minification to src level */
 328       _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, srcLevel);
 329
 330       /* setup viewport */
 331       _mesa_set_viewport(ctx, 0, 0, 0, dstWidth, dstHeight);
 332       _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0);
 333
 334       for (layer = 0; layer < dstDepth; ++layer) {
 335          /* Setup texture coordinates */
 336          _mesa_meta_setup_texture_coords(faceTarget,
 337                                          layer,
 338                                          0, 0, /* xoffset, yoffset */
 339                                          srcWidth, srcHeight, /* img size */
 340                                          srcWidth, srcHeight, srcDepth,
 341                                          verts[0].tex,
 342                                          verts[1].tex,
 343                                          verts[2].tex,
 344                                          verts[3].tex);
 345
 346          /* upload vertex data */
 347          _mesa_buffer_data(ctx, mipmap->buf_obj, GL_NONE, sizeof(verts), verts,
 348                            GL_DYNAMIC_DRAW, __func__);
 349
 350          _mesa_meta_bind_fbo_image(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, dstImage, layer);
 351
 352          /* sanity check */
 353          if (_mesa_CheckFramebufferStatus(GL_FRAMEBUFFER) !=
 354              GL_FRAMEBUFFER_COMPLETE) {
 355             _mesa_problem(ctx, "Unexpected incomplete framebuffer in "
 356                           "_mesa_meta_GenerateMipmap()");
 357             break;
 358          }
 359
 360          assert(dstWidth == ctx->DrawBuffer->Width);
 361          if (target == GL_TEXTURE_1D_ARRAY) {
 362             assert(dstHeight == 1);
 363          } else {
 364             assert(dstHeight == ctx->DrawBuffer->Height);
 365          }
 366
 367          _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 368       }
 369    }
 370
 371    _mesa_lock_texture(ctx, texObj); /* relock */
 372
 373    _mesa_BindSampler(ctx->Texture.CurrentUnit, samplerSave);
 374
 375    _mesa_meta_end(ctx);
 376
 377    _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevelSave);
 378    if (genMipmapSave)
 379       _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, genMipmapSave);
 380    if (swizzleSaved)
 381       _mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle);
 382 }