src/mesa/drivers/dri/intel/intel_generatemipmap.c

   1 /*
   2  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   3  * Copyright © 2009 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * 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 OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Eric Anholt <eric@anholt.net>
  26  *
  27  */
  28
  29 #include "main/glheader.h"
  30 #include "main/enums.h"
  31 #include "main/image.h"
  32 #include "main/mtypes.h"
  33 #include "main/macros.h"
  34 #include "main/bufferobj.h"
  35 #include "main/teximage.h"
  36 #include "main/texenv.h"
  37 #include "main/texobj.h"
  38 #include "main/texstate.h"
  39 #include "main/texparam.h"
  40 #include "main/varray.h"
  41 #include "main/attrib.h"
  42 #include "main/enable.h"
  43 #include "main/buffers.h"
  44 #include "main/fbobject.h"
  45 #include "main/framebuffer.h"
  46 #include "main/renderbuffer.h"
  47 #include "main/depth.h"
  48 #include "main/hash.h"
  49 #include "main/mipmap.h"
  50 #include "main/blend.h"
  51 #include "glapi/dispatch.h"
  52 #include "swrast/swrast.h"
  53
  54 #include "intel_screen.h"
  55 #include "intel_context.h"
  56 #include "intel_batchbuffer.h"
  57 #include "intel_pixel.h"
  58 #include "intel_tex.h"
  59 #include "intel_mipmap_tree.h"
  60
  61 static const char *intel_fp_tex2d =
  62       "!!ARBfp1.0\n"
  63       "TEX result.color, fragment.texcoord[0], texture[0], 2D;\n"
  64       "END\n";
  65
  66 static GLboolean
  67 intel_generate_mipmap_level(GLcontext *ctx, GLuint tex_name,
  68                             int level, int width, int height)
  69 {
  70    struct intel_context *intel = intel_context(ctx);
  71    GLfloat vertices[4][2];
  72    GLint status;
  73
  74    /* Set to source from the previous level */
  75    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, level - 1);
  76    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, level - 1);
  77
  78    /* Set to draw into the current level */
  79    _mesa_FramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  80                                  GL_COLOR_ATTACHMENT0_EXT,
  81                                  GL_TEXTURE_2D,
  82                                  tex_name,
  83                                  level);
  84    /* Choose to render to the color attachment. */
  85    _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
  86
  87    status = _mesa_CheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  88    if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
  89       return GL_FALSE;
  90
  91    meta_set_passthrough_transform(&intel->meta);
  92
  93    /* XXX: Doing it right would involve setting up the transformation to do
  94     * 0-1 mapping or something, and not changing the vertex data.
  95     */
  96    vertices[0][0] = 0;
  97    vertices[0][1] = 0;
  98    vertices[1][0] = width;
  99    vertices[1][1] = 0;
 100    vertices[2][0] = width;
 101    vertices[2][1] = height;
 102    vertices[3][0] = 0;
 103    vertices[3][1] = height;
 104
 105    _mesa_VertexPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &vertices);
 106    _mesa_Enable(GL_VERTEX_ARRAY);
 107    meta_set_default_texrect(&intel->meta);
 108
 109    _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 110
 111    meta_restore_texcoords(&intel->meta);
 112    meta_restore_transform(&intel->meta);
 113
 114    return GL_TRUE;
 115 }
 116
 117 static GLboolean
 118 intel_generate_mipmap_2d(GLcontext *ctx,
 119                          GLenum target,
 120                          struct gl_texture_object *texObj)
 121 {
 122    struct intel_context *intel = intel_context(ctx);
 123    GLint old_active_texture;
 124    int level, max_levels, start_level, end_level;
 125    GLuint fb_name;
 126    GLboolean success = GL_FALSE;
 127    struct gl_framebuffer *saved_fbo = NULL;
 128
 129    _mesa_PushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT |
 130                     GL_CURRENT_BIT | GL_COLOR_BUFFER_BIT |
 131                     GL_DEPTH_BUFFER_BIT);
 132    _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
 133    old_active_texture = ctx->Texture.CurrentUnit;
 134    _mesa_reference_framebuffer(&saved_fbo, ctx->DrawBuffer);
 135
 136    _mesa_Disable(GL_POLYGON_STIPPLE);
 137    _mesa_Disable(GL_DEPTH_TEST);
 138    _mesa_Disable(GL_STENCIL_TEST);
 139    _mesa_ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
 140    _mesa_DepthMask(GL_FALSE);
 141
 142    /* Bind the given texture to GL_TEXTURE_2D with linear filtering for our
 143     * minification.
 144     */
 145    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB);
 146    _mesa_Enable(GL_TEXTURE_2D);
 147    _mesa_BindTexture(GL_TEXTURE_2D, texObj->Name);
 148    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 149                        GL_LINEAR_MIPMAP_NEAREST);
 150    _mesa_TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 151
 152    /* Bind the new renderbuffer to the color attachment point. */
 153    _mesa_GenFramebuffersEXT(1, &fb_name);
 154    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb_name);
 155
 156    meta_set_fragment_program(&intel->meta, &intel->meta.tex2d_fp,
 157                              intel_fp_tex2d);
 158    meta_set_passthrough_vertex_program(&intel->meta);
 159
 160    max_levels = _mesa_max_texture_levels(ctx, texObj->Target);
 161    start_level = texObj->BaseLevel;
 162    end_level = texObj->MaxLevel;
 163
 164    /* Loop generating level+1 from level. */
 165    for (level = start_level; level < end_level && level < max_levels - 1; level++) {
 166       const struct gl_texture_image *srcImage;
 167       int width, height;
 168
 169       srcImage = _mesa_select_tex_image(ctx, texObj, target, level);
 170       if (srcImage->Border != 0)
 171          goto fail;
 172
 173       width = srcImage->Width / 2;
 174       if (width < 1)
 175          width = 1;
 176       height = srcImage->Height / 2;
 177       if (height < 1)
 178          height = 1;
 179
 180       if (width == srcImage->Width &&
 181           height == srcImage->Height) {
 182          /* Neither _mesa_max_texture_levels nor texObj->MaxLevel are the
 183           * maximum texture level for the object, so break out when we've gone
 184           * over the edge.
 185           */
 186          break;
 187       }
 188
 189       /* Make sure that there's space allocated for the target level.
 190        * We could skip this if there's already space allocated and save some
 191        * time.
 192        */
 193       _mesa_TexImage2D(GL_TEXTURE_2D, level + 1, srcImage->InternalFormat,
 194                        width, height, 0,
 195                        GL_RGBA, GL_UNSIGNED_INT, NULL);
 196
 197       if (!intel_generate_mipmap_level(ctx, texObj->Name, level + 1,
 198                                        width, height))
 199          goto fail;
 200    }
 201
 202    success = GL_TRUE;
 203
 204 fail:
 205    meta_restore_fragment_program(&intel->meta);
 206    meta_restore_vertex_program(&intel->meta);
 207
 208    _mesa_DeleteFramebuffersEXT(1, &fb_name);
 209    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + old_active_texture);
 210    if (saved_fbo)
 211       _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, saved_fbo->Name);
 212    _mesa_reference_framebuffer(&saved_fbo, NULL);
 213    _mesa_PopClientAttrib();
 214    _mesa_PopAttrib();
 215
 216    return success;
 217 }
 218
 219
 220 /**
 221  * Generate new mipmap data from BASE+1 to BASE+p (the minimally-sized mipmap
 222  * level).
 223  *
 224  * The texture object's miptree must be mapped.
 225  *
 226  * This function should also include an accelerated path.
 227  */
 228 void
 229 intel_generate_mipmap(GLcontext *ctx, GLenum target,
 230                       struct gl_texture_object *texObj)
 231 {
 232    struct intel_context *intel = intel_context(ctx);
 233    struct intel_texture_object *intelObj = intel_texture_object(texObj);
 234    GLuint nr_faces = (intelObj->base.Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 235    int face, i;
 236
 237    /* HW path */
 238    if (target == GL_TEXTURE_2D &&
 239        ctx->Extensions.EXT_framebuffer_object &&
 240        ctx->Extensions.ARB_fragment_program &&
 241        ctx->Extensions.ARB_vertex_program) {
 242       GLboolean success;
 243
 244       /* We'll be accessing this texture using GL entrypoints, which should
 245        * be resilient against other access to this texture.
 246        */
 247       _mesa_unlock_texture(ctx, texObj);
 248       success = intel_generate_mipmap_2d(ctx, target, texObj);
 249       _mesa_lock_texture(ctx, texObj);
 250
 251       if (success)
 252          return;
 253    }
 254
 255    /* SW path */
 256    intel_tex_map_level_images(intel, intelObj, texObj->BaseLevel);
 257    _mesa_generate_mipmap(ctx, target, texObj);
 258    intel_tex_unmap_level_images(intel, intelObj, texObj->BaseLevel);
 259
 260    /* Update the level information in our private data in the new images, since
 261     * it didn't get set as part of a normal TexImage path.
 262     */
 263    for (face = 0; face < nr_faces; face++) {
 264       for (i = texObj->BaseLevel + 1; i < texObj->MaxLevel; i++) {
 265          struct intel_texture_image *intelImage;
 266
 267          intelImage = intel_texture_image(texObj->Image[face][i]);
 268          if (intelImage == NULL)
 269             break;
 270
 271          intelImage->level = i;
 272          intelImage->face = face;
 273          /* Unreference the miptree to signal that the new Data is a bare
 274           * pointer from mesa.
 275           */
 276          intel_miptree_release(intel, &intelImage->mt);
 277       }
 278    }
 279 }