/**
 * Try to do a color or depth glBlitFramebuffer using texturing.
 *
 * We can do this when the src renderbuffer is actually a texture, or when the
 * driver exposes BindRenderbufferTexImage().
 */
static bool
blitframebuffer_texture(struct gl_context *ctx,
                        const struct gl_framebuffer *readFb,
                        const struct gl_framebuffer *drawFb,
                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
                        GLenum filter, GLint flipX, GLint flipY,
                        GLboolean glsl_version, GLboolean do_depth)
{
   int att_index = do_depth ? BUFFER_DEPTH : readFb->_ColorReadBufferIndex;
   const struct gl_renderbuffer_attachment *readAtt =
      &readFb->Attachment[att_index];
   struct blit_state *blit = &ctx->Meta->Blit;
   struct fb_tex_blit_state fb_tex_blit;
   const GLint dstX = MIN2(dstX0, dstX1);
   const GLint dstY = MIN2(dstY0, dstY1);
   const GLint dstW = abs(dstX1 - dstX0);
   const GLint dstH = abs(dstY1 - dstY0);
   const int srcW = abs(srcX1 - srcX0);
   const int srcH = abs(srcY1 - srcY0);
   bool scaled_blit = false;
   struct gl_texture_object *texObj;
   GLuint srcLevel;
   GLenum target;
   struct gl_renderbuffer *rb = readAtt->Renderbuffer;
   struct temp_texture *meta_temp_texture;

   if (rb->NumSamples && !ctx->Extensions.ARB_texture_multisample)
      return false;

   _mesa_meta_fb_tex_blit_begin(ctx, &fb_tex_blit);

   if (readAtt->Texture &&
       (readAtt->Texture->Target == GL_TEXTURE_2D ||
        readAtt->Texture->Target == GL_TEXTURE_RECTANGLE ||
        readAtt->Texture->Target == GL_TEXTURE_2D_MULTISAMPLE ||
        readAtt->Texture->Target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY)) {
      /* If there's a texture attached of a type we can handle, then just use
       * it directly.
       */
      srcLevel = readAtt->TextureLevel;
      texObj = readAtt->Texture;
      target = texObj->Target;
   } else if (!readAtt->Texture && ctx->Driver.BindRenderbufferTexImage) {
      if (!_mesa_meta_bind_rb_as_tex_image(ctx, rb, &fb_tex_blit.tempTex,
                                           &texObj, &target))
         return false;

      srcLevel = 0;
      if (_mesa_is_winsys_fbo(readFb)) {
         GLint temp = srcY0;
         srcY0 = rb->Height - srcY1;
         srcY1 = rb->Height - temp;
         flipY = -flipY;
      }
   } else {
      GLenum tex_base_format;
      /* Fall back to doing a CopyTexSubImage to get the destination
       * renderbuffer into a texture.
       */
      if (ctx->Meta->Blit.no_ctsi_fallback)
         return false;

      if (rb->NumSamples > 1)
         return false;

      if (do_depth) {
         meta_temp_texture = _mesa_meta_get_temp_depth_texture(ctx);
         tex_base_format = GL_DEPTH_COMPONENT;
      } else {
         meta_temp_texture = _mesa_meta_get_temp_texture(ctx);
         tex_base_format =
            _mesa_base_tex_format(ctx, rb->InternalFormat);
      }

      srcLevel = 0;
      target = meta_temp_texture->Target;
      texObj = _mesa_lookup_texture(ctx, meta_temp_texture->TexObj);
      if (texObj == NULL) {
         return false;
      }

      _mesa_meta_setup_copypix_texture(ctx, meta_temp_texture,
                                       srcX0, srcY0,
                                       srcW, srcH,
                                       tex_base_format,
                                       filter);


      srcX0 = 0;
      srcY0 = 0;
      srcX1 = srcW;
      srcY1 = srcH;
   }

   fb_tex_blit.baseLevelSave = texObj->BaseLevel;
   fb_tex_blit.maxLevelSave = texObj->MaxLevel;
   fb_tex_blit.stencilSamplingSave = texObj->StencilSampling;

   scaled_blit = dstW != srcW || dstH != srcH;

   if (glsl_version) {
      setup_glsl_blit_framebuffer(ctx, blit, drawFb, rb, target, filter, scaled_blit,
                                  do_depth);
   }
   else {
      _mesa_meta_setup_ff_tnl_for_blit(ctx,
                                       &ctx->Meta->Blit.VAO,
                                       &ctx->Meta->Blit.buf_obj,
                                       2);
   }

   /*
     printf("Blit from texture!\n");
     printf("  srcAtt %p  dstAtt %p\n", readAtt, drawAtt);
     printf("  srcTex %p  dstText %p\n", texObj, drawAtt->Texture);
   */

   fb_tex_blit.sampler = _mesa_meta_setup_sampler(ctx, texObj, target, filter,
                                                  srcLevel);

   /* Always do our blits with no net sRGB decode or encode.
    *
    * However, if both the src and dst can be srgb decode/encoded, enable them
    * so that we do any blending (from scaling or from MSAA resolves) in the
    * right colorspace.
    *
    * Our choice of not doing any net encode/decode is from the GL 3.0
    * specification:
    *
    *     "Blit operations bypass the fragment pipeline. The only fragment
    *      operations which affect a blit are the pixel ownership test and the
    *      scissor test."
    *
    * The GL 4.4 specification disagrees and says that the sRGB part of the
    * fragment pipeline applies, but this was found to break applications.
    */
   if (ctx->Extensions.EXT_texture_sRGB_decode) {
      if (_mesa_get_format_color_encoding(rb->Format) == GL_SRGB &&
          drawFb->Visual.sRGBCapable) {
         _mesa_SamplerParameteri(fb_tex_blit.sampler,
                                 GL_TEXTURE_SRGB_DECODE_EXT, GL_DECODE_EXT);
         _mesa_set_framebuffer_srgb(ctx, GL_TRUE);
      } else {
         _mesa_SamplerParameteri(fb_tex_blit.sampler,
                                 GL_TEXTURE_SRGB_DECODE_EXT,
                                 GL_SKIP_DECODE_EXT);
         /* set_framebuffer_srgb was set by _mesa_meta_begin(). */
      }
   }

   if (!glsl_version) {
      _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
      _mesa_set_enable(ctx, target, GL_TRUE);
   }

   /* Prepare vertex data (the VBO was previously created and bound) */
   {
      struct vertex verts[4];
      GLfloat s0, t0, s1, t1;

      if (target == GL_TEXTURE_2D) {
         const struct gl_texture_image *texImage
            = _mesa_select_tex_image(texObj, target, srcLevel);
         s0 = srcX0 / (float) texImage->Width;
         s1 = srcX1 / (float) texImage->Width;
         t0 = srcY0 / (float) texImage->Height;
         t1 = srcY1 / (float) texImage->Height;
      }
      else {
         assert(target == GL_TEXTURE_RECTANGLE_ARB ||
                target == GL_TEXTURE_2D_MULTISAMPLE ||
                target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY);
         s0 = (float) srcX0;
         s1 = (float) srcX1;
         t0 = (float) srcY0;
         t1 = (float) srcY1;
      }

      /* Silence valgrind warnings about reading uninitialized stack. */
      memset(verts, 0, sizeof(verts));

      /* setup vertex positions */
      verts[0].x = -1.0F * flipX;
      verts[0].y = -1.0F * flipY;
      verts[1].x =  1.0F * flipX;
      verts[1].y = -1.0F * flipY;
      verts[2].x =  1.0F * flipX;
      verts[2].y =  1.0F * flipY;
      verts[3].x = -1.0F * flipX;
      verts[3].y =  1.0F * flipY;

      verts[0].tex[0] = s0;
      verts[0].tex[1] = t0;
      verts[0].tex[2] = readAtt->Zoffset;
      verts[1].tex[0] = s1;
      verts[1].tex[1] = t0;
      verts[1].tex[2] = readAtt->Zoffset;
      verts[2].tex[0] = s1;
      verts[2].tex[1] = t1;
      verts[2].tex[2] = readAtt->Zoffset;
      verts[3].tex[0] = s0;
      verts[3].tex[1] = t1;
      verts[3].tex[2] = readAtt->Zoffset;

      _mesa_buffer_sub_data(ctx, blit->buf_obj, 0, sizeof(verts), verts,
                            __func__);
   }

   /* setup viewport */
   _mesa_set_viewport(ctx, 0, dstX, dstY, dstW, dstH);
   _mesa_ColorMask(!do_depth, !do_depth, !do_depth, !do_depth);
   _mesa_set_enable(ctx, GL_DEPTH_TEST, do_depth);
   _mesa_DepthMask(do_depth);
   _mesa_DepthFunc(GL_ALWAYS);

   _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
   _mesa_meta_fb_tex_blit_end(ctx, target, &fb_tex_blit);

   return true;
}
예제 #2
0
/**
 * Called via ctx->Driver.GenerateMipmap()
 * Note: We don't yet support 3D textures, or texture borders.
 */
void
_mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
                          struct gl_texture_object *texObj)
{
   struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
   struct vertex verts[4];
   const GLuint baseLevel = texObj->BaseLevel;
   const GLuint maxLevel = texObj->MaxLevel;
   const GLint maxLevelSave = texObj->MaxLevel;
   const GLboolean genMipmapSave = texObj->GenerateMipmap;
   const GLboolean use_glsl_version = ctx->Extensions.ARB_vertex_shader &&
                                      ctx->Extensions.ARB_fragment_shader;
   GLenum faceTarget;
   GLuint dstLevel;
   struct gl_sampler_object *samp_obj_save = NULL;
   GLint swizzle[4];
   GLboolean swizzleSaved = GL_FALSE;

   /* GLint so the compiler won't complain about type signedness mismatch in
    * the calls to _mesa_texture_parameteriv below.
    */
   static const GLint always_false = GL_FALSE;
   static const GLint always_true = GL_TRUE;

   if (fallback_required(ctx, target, texObj)) {
      _mesa_generate_mipmap(ctx, target, texObj);
      return;
   }

   if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
       target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
      faceTarget = target;
      target = GL_TEXTURE_CUBE_MAP;
   } else {
      faceTarget = target;
   }

   _mesa_meta_begin(ctx, MESA_META_ALL & ~MESA_META_DRAW_BUFFERS);
   _mesa_ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);

   /* Choose between glsl version and fixed function version of
    * GenerateMipmap function.
    */
   if (use_glsl_version) {
      _mesa_meta_setup_vertex_objects(ctx, &mipmap->VAO, &mipmap->buf_obj, true,
                                      2, 4, 0);
      _mesa_meta_setup_blit_shader(ctx, target, false, &mipmap->shaders);
   } else {
      _mesa_meta_setup_ff_tnl_for_blit(ctx, &mipmap->VAO, &mipmap->buf_obj, 3);
      _mesa_set_enable(ctx, target, GL_TRUE);
   }

   _mesa_reference_sampler_object(ctx, &samp_obj_save,
                                  ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler);

   /* We may have been called from glGenerateTextureMipmap with CurrentUnit
    * still set to 0, so we don't know when we can skip binding the texture.
    * Assume that _mesa_BindTexture will be fast if we're rebinding the same
    * texture.
    */
   _mesa_BindTexture(target, texObj->Name);

   if (mipmap->samp_obj == NULL) {
      mipmap->samp_obj =  ctx->Driver.NewSamplerObject(ctx, 0xDEADBEEF);
      if (mipmap->samp_obj == NULL) {
         /* This is a bit lazy.  Flag out of memory, and then don't bother to
          * clean up.  Once out of memory is flagged, the only realistic next
          * move is to destroy the context.  That will trigger all the right
          * clean up.
          */
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenerateMipmap");
         return;
      }

      _mesa_set_sampler_filters(ctx, mipmap->samp_obj, GL_LINEAR_MIPMAP_LINEAR,
                                GL_LINEAR);
      _mesa_set_sampler_wrap(ctx, mipmap->samp_obj, GL_CLAMP_TO_EDGE,
                             GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);

      /* We don't want to encode or decode sRGB values; treat them as linear. */
      _mesa_set_sampler_srgb_decode(ctx, mipmap->samp_obj, GL_SKIP_DECODE_EXT);
   }

   _mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, mipmap->samp_obj);

   assert(mipmap->fb != NULL);
   _mesa_bind_framebuffers(ctx, mipmap->fb, mipmap->fb);

   _mesa_texture_parameteriv(ctx, texObj, GL_GENERATE_MIPMAP, &always_false, false);

   if (texObj->_Swizzle != SWIZZLE_NOOP) {
      static const GLint swizzleNoop[4] = { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA };
      memcpy(swizzle, texObj->Swizzle, sizeof(swizzle));
      swizzleSaved = GL_TRUE;
      _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_SWIZZLE_RGBA,
                                swizzleNoop, false);
   }

   /* Silence valgrind warnings about reading uninitialized stack. */
   memset(verts, 0, sizeof(verts));

   /* setup vertex positions */
   verts[0].x = -1.0F;
   verts[0].y = -1.0F;
   verts[1].x =  1.0F;
   verts[1].y = -1.0F;
   verts[2].x =  1.0F;
   verts[2].y =  1.0F;
   verts[3].x = -1.0F;
   verts[3].y =  1.0F;

   /* texture is already locked, unlock now */
   _mesa_unlock_texture(ctx, texObj);

   _mesa_prepare_mipmap_levels(ctx, texObj, baseLevel, maxLevel);

   for (dstLevel = baseLevel + 1; dstLevel <= maxLevel; dstLevel++) {
      const struct gl_texture_image *srcImage;
      struct gl_texture_image *dstImage;
      const GLuint srcLevel = dstLevel - 1;
      GLuint layer;
      GLsizei srcWidth, srcHeight, srcDepth;
      GLsizei dstWidth, dstHeight, dstDepth;

      srcImage = _mesa_select_tex_image(texObj, faceTarget, srcLevel);
      assert(srcImage->Border == 0);

      /* src size */
      srcWidth = srcImage->Width;
      if (target == GL_TEXTURE_1D_ARRAY) {
         srcHeight = 1;
         srcDepth = srcImage->Height;
      } else {
         srcHeight = srcImage->Height;
         srcDepth = srcImage->Depth;
      }

      /* new dst size */
      dstWidth = minify(srcWidth, 1);
      dstHeight = minify(srcHeight, 1);
      dstDepth = target == GL_TEXTURE_3D ? minify(srcDepth, 1) : srcDepth;

      if (dstWidth == srcWidth &&
          dstHeight == srcHeight &&
          dstDepth == srcDepth) {
         /* all done */
         break;
      }

      /* Allocate storage for the destination mipmap image(s) */

      /* Set MaxLevel large enough to hold the new level when we allocate it */
      _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_MAX_LEVEL,
                                (GLint *) &dstLevel, false);

      dstImage = _mesa_select_tex_image(texObj, faceTarget, dstLevel);

      /* All done.  We either ran out of memory or we would go beyond the last
       * valid level of an immutable texture if we continued.
       */
      if (dstImage == NULL)
         break;

      /* limit minification to src level */
      _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_MAX_LEVEL,
                                (GLint *) &srcLevel, false);

      /* setup viewport */
      _mesa_set_viewport(ctx, 0, 0, 0, dstWidth, dstHeight);
      _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0);

      for (layer = 0; layer < dstDepth; ++layer) {
         /* Setup texture coordinates */
         _mesa_meta_setup_texture_coords(faceTarget,
                                         layer,
                                         0, 0, /* xoffset, yoffset */
                                         srcWidth, srcHeight, /* img size */
                                         srcWidth, srcHeight, srcDepth,
                                         verts[0].tex,
                                         verts[1].tex,
                                         verts[2].tex,
                                         verts[3].tex);

         /* upload vertex data */
         _mesa_buffer_data(ctx, mipmap->buf_obj, GL_NONE, sizeof(verts), verts,
                           GL_DYNAMIC_DRAW, __func__);

         _mesa_meta_framebuffer_texture_image(ctx, ctx->DrawBuffer,
                                              GL_COLOR_ATTACHMENT0, dstImage,
                                              layer);

         /* sanity check */
         if (_mesa_check_framebuffer_status(ctx, ctx->DrawBuffer) !=
             GL_FRAMEBUFFER_COMPLETE) {
            _mesa_problem(ctx, "Unexpected incomplete framebuffer in "
                          "_mesa_meta_GenerateMipmap()");
            break;
         }

         assert(dstWidth == ctx->DrawBuffer->Width);
         if (target == GL_TEXTURE_1D_ARRAY) {
            assert(dstHeight == 1);
         } else {
            assert(dstHeight == ctx->DrawBuffer->Height);
         }

         _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
      }
   }

   _mesa_lock_texture(ctx, texObj); /* relock */

   _mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, samp_obj_save);
   _mesa_reference_sampler_object(ctx, &samp_obj_save, NULL);

   _mesa_meta_end(ctx);

   _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_MAX_LEVEL, &maxLevelSave,
                             false);
   if (genMipmapSave)
      _mesa_texture_parameteriv(ctx, texObj, GL_GENERATE_MIPMAP, &always_true,
                                false);
   if (swizzleSaved)
      _mesa_texture_parameteriv(ctx, texObj, GL_TEXTURE_SWIZZLE_RGBA, swizzle,
                                false);
}
예제 #3
0
/**
 * Called via ctx->Driver.GenerateMipmap()
 * Note: We don't yet support 3D textures, 1D/2D array textures or texture
 * borders.
 */
void
_mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
                          struct gl_texture_object *texObj)
{
   struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
   struct vertex verts[4];
   const GLuint baseLevel = texObj->BaseLevel;
   const GLuint maxLevel = texObj->MaxLevel;
   const GLint maxLevelSave = texObj->MaxLevel;
   const GLboolean genMipmapSave = texObj->GenerateMipmap;
   const GLuint currentTexUnitSave = ctx->Texture.CurrentUnit;
   const GLboolean use_glsl_version = ctx->Extensions.ARB_vertex_shader &&
                                      ctx->Extensions.ARB_fragment_shader;
   GLenum faceTarget;
   GLuint dstLevel;
   GLuint samplerSave;
   GLint swizzle[4];
   GLboolean swizzleSaved = GL_FALSE;

   if (fallback_required(ctx, target, texObj)) {
      _mesa_generate_mipmap(ctx, target, texObj);
      return;
   }

   if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
       target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
      faceTarget = target;
      target = GL_TEXTURE_CUBE_MAP;
   } else {
      faceTarget = target;
   }

   _mesa_meta_begin(ctx, MESA_META_ALL & ~MESA_META_DRAW_BUFFERS);

   /* Choose between glsl version and fixed function version of
    * GenerateMipmap function.
    */
   if (use_glsl_version) {
      _mesa_meta_setup_vertex_objects(&mipmap->VAO, &mipmap->VBO, true,
                                      2, 4, 0);
      _mesa_meta_setup_blit_shader(ctx, target, false, &mipmap->shaders);
   } else {
      _mesa_meta_setup_ff_tnl_for_blit(&mipmap->VAO, &mipmap->VBO, 3);
      _mesa_set_enable(ctx, target, GL_TRUE);
   }

   samplerSave = ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler ?
      ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler->Name : 0;

   if (currentTexUnitSave != 0)
      _mesa_BindTexture(target, texObj->Name);

   if (!mipmap->Sampler) {
      _mesa_GenSamplers(1, &mipmap->Sampler);
      _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);

      _mesa_SamplerParameteri(mipmap->Sampler,
                              GL_TEXTURE_MIN_FILTER,
                              GL_LINEAR_MIPMAP_LINEAR);
      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

      /* We don't want to encode or decode sRGB values; treat them as linear.
       * This is not technically correct for GLES3 but we don't get any API
       * error at the moment.
       */
      if (ctx->Extensions.EXT_texture_sRGB_decode) {
         _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_SRGB_DECODE_EXT,
               GL_SKIP_DECODE_EXT);
      }
   } else {
      _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
   }

   assert(mipmap->FBO != 0);
   _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, mipmap->FBO);

   _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, GL_FALSE);

   if (texObj->_Swizzle != SWIZZLE_NOOP) {
      static const GLint swizzleNoop[4] = { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA };
      memcpy(swizzle, texObj->Swizzle, sizeof(swizzle));
      swizzleSaved = GL_TRUE;
      _mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzleNoop);
   }

   /* Silence valgrind warnings about reading uninitialized stack. */
   memset(verts, 0, sizeof(verts));

   /* setup vertex positions */
   verts[0].x = -1.0F;
   verts[0].y = -1.0F;
   verts[1].x =  1.0F;
   verts[1].y = -1.0F;
   verts[2].x =  1.0F;
   verts[2].y =  1.0F;
   verts[3].x = -1.0F;
   verts[3].y =  1.0F;

   /* texture is already locked, unlock now */
   _mesa_unlock_texture(ctx, texObj);

   for (dstLevel = baseLevel + 1; dstLevel <= maxLevel; dstLevel++) {
      const struct gl_texture_image *srcImage;
      struct gl_texture_image *dstImage;
      const GLuint srcLevel = dstLevel - 1;
      GLuint layer;
      GLsizei srcWidth, srcHeight, srcDepth;
      GLsizei dstWidth, dstHeight, dstDepth;

      srcImage = _mesa_select_tex_image(texObj, faceTarget, srcLevel);
      assert(srcImage->Border == 0);

      /* src size */
      srcWidth = srcImage->Width;
      if (target == GL_TEXTURE_1D_ARRAY) {
         srcHeight = 1;
         srcDepth = srcImage->Height;
      } else {
         srcHeight = srcImage->Height;
         srcDepth = srcImage->Depth;
      }

      /* new dst size */
      dstWidth = minify(srcWidth, 1);
      dstHeight = minify(srcHeight, 1);
      dstDepth = target == GL_TEXTURE_3D ? minify(srcDepth, 1) : srcDepth;

      if (dstWidth == srcWidth &&
          dstHeight == srcHeight &&
          dstDepth == srcDepth) {
         /* all done */
         break;
      }

      /* Allocate storage for the destination mipmap image(s) */

      /* Set MaxLevel large enough to hold the new level when we allocate it */
      _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, dstLevel);

      if (!prepare_mipmap_level(ctx, texObj, dstLevel,
                                dstWidth, dstHeight, dstDepth,
                                srcImage->InternalFormat,
                                srcImage->TexFormat)) {
         /* All done.  We either ran out of memory or we would go beyond the
          * last valid level of an immutable texture if we continued.
          */
         break;
      }
      dstImage = _mesa_select_tex_image(texObj, faceTarget, dstLevel);

      /* limit minification to src level */
      _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, srcLevel);

      /* setup viewport */
      _mesa_set_viewport(ctx, 0, 0, 0, dstWidth, dstHeight);
      _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0);

      for (layer = 0; layer < dstDepth; ++layer) {
         /* Setup texture coordinates */
         _mesa_meta_setup_texture_coords(faceTarget,
                                         layer,
                                         0, 0, 1, /* width, height never used here */
                                         verts[0].tex,
                                         verts[1].tex,
                                         verts[2].tex,
                                         verts[3].tex);

         /* upload vertex data */
         _mesa_BufferData(GL_ARRAY_BUFFER_ARB, sizeof(verts),
                          verts, GL_DYNAMIC_DRAW_ARB);

         _mesa_meta_bind_fbo_image(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, dstImage, layer);

         /* sanity check */
         if (_mesa_CheckFramebufferStatus(GL_FRAMEBUFFER) !=
             GL_FRAMEBUFFER_COMPLETE) {
            _mesa_problem(ctx, "Unexpected incomplete framebuffer in "
                          "_mesa_meta_GenerateMipmap()");
            break;
         }

         assert(dstWidth == ctx->DrawBuffer->Width);
         if (target == GL_TEXTURE_1D_ARRAY) {
            assert(dstHeight == 1);
         } else {
            assert(dstHeight == ctx->DrawBuffer->Height);
         }

         _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
      }
   }

   _mesa_lock_texture(ctx, texObj); /* relock */

   _mesa_BindSampler(ctx->Texture.CurrentUnit, samplerSave);

   _mesa_meta_end(ctx);

   _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevelSave);
   if (genMipmapSave)
      _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, genMipmapSave);
   if (swizzleSaved)
      _mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle);
}
예제 #4
0
/**
 * Perform glClear where mask contains only color, depth, and/or stencil.
 *
 * The implementation is based on calling into Mesa to set GL state and
 * performing normal triangle rendering.  The intent of this path is to
 * have as generic a path as possible, so that any driver could make use of
 * it.
 */
void
intel_clear_tris(GLcontext *ctx, GLbitfield mask)
{
   struct intel_context *intel = intel_context(ctx);
   GLfloat dst_z;
   struct gl_framebuffer *fb = ctx->DrawBuffer;
   int i;
   GLboolean saved_fp_enable = GL_FALSE, saved_vp_enable = GL_FALSE;
   GLuint saved_shader_program = 0;
   unsigned int saved_active_texture;
   struct gl_array_object *arraySave = NULL;

   if (!intel->clear.arrayObj)
      init_clear(ctx);

   assert((mask & ~(TRI_CLEAR_COLOR_BITS | BUFFER_BIT_DEPTH |
		    BUFFER_BIT_STENCIL)) == 0);

   _mesa_PushAttrib(GL_COLOR_BUFFER_BIT |
		    GL_CURRENT_BIT |
		    GL_DEPTH_BUFFER_BIT |
		    GL_ENABLE_BIT |
		    GL_POLYGON_BIT |
		    GL_STENCIL_BUFFER_BIT |
		    GL_TRANSFORM_BIT |
		    GL_CURRENT_BIT);
   saved_active_texture = ctx->Texture.CurrentUnit;

   /* Disable existing GL state we don't want to apply to a clear. */
   _mesa_Disable(GL_ALPHA_TEST);
   _mesa_Disable(GL_BLEND);
   _mesa_Disable(GL_CULL_FACE);
   _mesa_Disable(GL_FOG);
   _mesa_Disable(GL_POLYGON_SMOOTH);
   _mesa_Disable(GL_POLYGON_STIPPLE);
   _mesa_Disable(GL_POLYGON_OFFSET_FILL);
   _mesa_Disable(GL_LIGHTING);
   _mesa_Disable(GL_CLIP_PLANE0);
   _mesa_Disable(GL_CLIP_PLANE1);
   _mesa_Disable(GL_CLIP_PLANE2);
   _mesa_Disable(GL_CLIP_PLANE3);
   _mesa_Disable(GL_CLIP_PLANE4);
   _mesa_Disable(GL_CLIP_PLANE5);
   _mesa_PolygonMode(GL_FRONT_AND_BACK, GL_FILL);
   if (ctx->Extensions.ARB_fragment_program && ctx->FragmentProgram.Enabled) {
      saved_fp_enable = GL_TRUE;
      _mesa_Disable(GL_FRAGMENT_PROGRAM_ARB);
   }
   if (ctx->Extensions.ARB_vertex_program && ctx->VertexProgram.Enabled) {
      saved_vp_enable = GL_TRUE;
      _mesa_Disable(GL_VERTEX_PROGRAM_ARB);
   }
   if (ctx->Extensions.ARB_shader_objects && ctx->Shader.CurrentProgram) {
      saved_shader_program = ctx->Shader.CurrentProgram->Name;
      _mesa_UseProgramObjectARB(0);
   }

   if (ctx->Texture._EnabledUnits != 0) {
      int i;

      for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
	 _mesa_ActiveTextureARB(GL_TEXTURE0 + i);
	 _mesa_Disable(GL_TEXTURE_1D);
	 _mesa_Disable(GL_TEXTURE_2D);
	 _mesa_Disable(GL_TEXTURE_3D);
	 if (ctx->Extensions.ARB_texture_cube_map)
	    _mesa_Disable(GL_TEXTURE_CUBE_MAP_ARB);
	 if (ctx->Extensions.NV_texture_rectangle)
	    _mesa_Disable(GL_TEXTURE_RECTANGLE_NV);
	 if (ctx->Extensions.MESA_texture_array) {
	    _mesa_Disable(GL_TEXTURE_1D_ARRAY_EXT);
	    _mesa_Disable(GL_TEXTURE_2D_ARRAY_EXT);
	 }
      }
   }

   /* save current array object, bind our private one */
   _mesa_reference_array_object(ctx, &arraySave, ctx->Array.ArrayObj);
   _mesa_reference_array_object(ctx, &ctx->Array.ArrayObj, intel->clear.arrayObj);

   intel_meta_set_passthrough_transform(intel);

   for (i = 0; i < 4; i++) {
      COPY_4FV(intel->clear.color[i], ctx->Color.ClearColor);
   }

   /* convert clear Z from [0,1] to NDC coord in [-1,1] */
   dst_z = -1.0 + 2.0 * ctx->Depth.Clear;

   /* Prepare the vertices, which are the same regardless of which buffer we're
    * drawing to.
    */
   intel->clear.vertices[0][0] = fb->_Xmin;
   intel->clear.vertices[0][1] = fb->_Ymin;
   intel->clear.vertices[0][2] = dst_z;
   intel->clear.vertices[1][0] = fb->_Xmax;
   intel->clear.vertices[1][1] = fb->_Ymin;
   intel->clear.vertices[1][2] = dst_z;
   intel->clear.vertices[2][0] = fb->_Xmax;
   intel->clear.vertices[2][1] = fb->_Ymax;
   intel->clear.vertices[2][2] = dst_z;
   intel->clear.vertices[3][0] = fb->_Xmin;
   intel->clear.vertices[3][1] = fb->_Ymax;
   intel->clear.vertices[3][2] = dst_z;

   while (mask != 0) {
      GLuint this_mask = 0;
      GLuint color_bit;

      color_bit = _mesa_ffs(mask & TRI_CLEAR_COLOR_BITS);
      if (color_bit != 0)
	 this_mask |= (1 << (color_bit - 1));

      /* Clear depth/stencil in the same pass as color. */
      this_mask |= (mask & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL));

      /* Select the current color buffer and use the color write mask if
       * we have one, otherwise don't write any color channels.
       */
      if (this_mask & BUFFER_BIT_FRONT_LEFT)
	 _mesa_DrawBuffer(GL_FRONT_LEFT);
      else if (this_mask & BUFFER_BIT_BACK_LEFT)
	 _mesa_DrawBuffer(GL_BACK_LEFT);
      else if (color_bit != 0)
	 _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0 +
			  (color_bit - BUFFER_COLOR0 - 1));
      else
	 _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);

      /* Control writing of the depth clear value to depth. */
      if (this_mask & BUFFER_BIT_DEPTH) {
	 _mesa_DepthFunc(GL_ALWAYS);
	 _mesa_Enable(GL_DEPTH_TEST);
      } else {
	 _mesa_Disable(GL_DEPTH_TEST);
	 _mesa_DepthMask(GL_FALSE);
      }

      /* Control writing of the stencil clear value to stencil. */
      if (this_mask & BUFFER_BIT_STENCIL) {
	 _mesa_Enable(GL_STENCIL_TEST);
	 _mesa_StencilOpSeparate(GL_FRONT_AND_BACK,
				 GL_REPLACE, GL_REPLACE, GL_REPLACE);
	 _mesa_StencilFuncSeparate(GL_FRONT_AND_BACK, GL_ALWAYS,
				   ctx->Stencil.Clear,
				   ctx->Stencil.WriteMask[0]);
      } else {
	 _mesa_Disable(GL_STENCIL_TEST);
      }

      _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);

      mask &= ~this_mask;
   }

   intel_meta_restore_transform(intel);

   _mesa_ActiveTextureARB(GL_TEXTURE0 + saved_active_texture);
   if (saved_fp_enable)
      _mesa_Enable(GL_FRAGMENT_PROGRAM_ARB);
   if (saved_vp_enable)
      _mesa_Enable(GL_VERTEX_PROGRAM_ARB);

   if (saved_shader_program)
      _mesa_UseProgramObjectARB(saved_shader_program);

   _mesa_PopAttrib();

   /* restore current array object */
   _mesa_reference_array_object(ctx, &ctx->Array.ArrayObj, arraySave);
   _mesa_reference_array_object(ctx, &arraySave, NULL);
}