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

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * 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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "main/glheader.h"
  29 #include "main/image.h"
  30 #include "main/state.h"
  31 #include "main/mtypes.h"
  32 #include "drivers/common/meta.h"
  33
  34 #include "intel_context.h"
  35 #include "intel_buffers.h"
  36 #include "intel_regions.h"
  37 #include "intel_pixel.h"
  38 #include "intel_fbo.h"
  39
  40 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  41
  42 static struct intel_region *
  43 copypix_src_region(struct intel_context *intel, GLenum type)
  44 {
  45    struct intel_renderbuffer *depth;
  46
  47    depth = (struct intel_renderbuffer *)
  48       &intel->ctx.DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
  49
  50    switch (type) {
  51    case GL_COLOR:
  52       return intel_readbuf_region(intel);
  53    case GL_DEPTH:
  54       /* Don't think this is really possible execpt at 16bpp, when we
  55        * have no stencil. */
  56       if (depth && depth->region->cpp == 2)
  57          return depth->region;
  58    case GL_STENCIL:
  59       /* Don't think this is really possible. */
  60       break;
  61    case GL_DEPTH_STENCIL_EXT:
  62       /* Does it matter whether it is stencil/depth or depth/stencil?
  63        */
  64       return depth->region;
  65    default:
  66       break;
  67    }
  68
  69    return NULL;
  70 }
  71
  72
  73 /**
  74  * Check if any fragment operations are in effect which might effect
  75  * glCopyPixels.  Differs from intel_check_blit_fragment_ops in that
  76  * we allow Scissor.
  77  */
  78 static GLboolean
  79 intel_check_copypixel_blit_fragment_ops(GLcontext * ctx)
  80 {
  81    if (ctx->NewState)
  82       _mesa_update_state(ctx);
  83
  84    /* Could do logicop with the blitter:
  85     */
  86    return !(ctx->_ImageTransferState ||
  87             ctx->Color.AlphaEnabled ||
  88             ctx->Depth.Test ||
  89             ctx->Fog.Enabled ||
  90             ctx->Stencil._Enabled ||
  91             !ctx->Color.ColorMask[0][0] ||
  92             !ctx->Color.ColorMask[0][1] ||
  93             !ctx->Color.ColorMask[0][2] ||
  94             !ctx->Color.ColorMask[0][3] ||
  95             ctx->Texture._EnabledUnits ||
  96             ctx->FragmentProgram._Enabled ||
  97             ctx->Color.BlendEnabled);
  98 }
  99
 100
 101 /**
 102  * CopyPixels with the blitter.  Don't support zooming, pixel transfer, etc.
 103  */
 104 static GLboolean
 105 do_blit_copypixels(GLcontext * ctx,
 106                    GLint srcx, GLint srcy,
 107                    GLsizei width, GLsizei height,
 108                    GLint dstx, GLint dsty, GLenum type)
 109 {
 110    struct intel_context *intel = intel_context(ctx);
 111    struct intel_region *dst = intel_drawbuf_region(intel);
 112    struct intel_region *src = copypix_src_region(intel, type);
 113    struct gl_framebuffer *fb = ctx->DrawBuffer;
 114    struct gl_framebuffer *read_fb = ctx->ReadBuffer;
 115    GLint orig_dstx;
 116    GLint orig_dsty;
 117    GLint orig_srcx;
 118    GLint orig_srcy;
 119
 120    if (type == GL_DEPTH || type == GL_STENCIL) {
 121       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 122          fprintf(stderr, "glCopyPixels() fallback: GL_DEPTH || GL_STENCIL\n");
 123       return GL_FALSE;
 124    }
 125
 126    /* Update draw buffer bounds */
 127    _mesa_update_state(ctx);
 128
 129    /* Copypixels can be more than a straight copy.  Ensure all the
 130     * extra operations are disabled:
 131     */
 132    if (!intel_check_copypixel_blit_fragment_ops(ctx) ||
 133        ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F)
 134       return GL_FALSE;
 135
 136    if (!src || !dst)
 137       return GL_FALSE;
 138
 139    intelFlush(&intel->ctx);
 140
 141    /* XXX: We fail to handle different inversion between read and draw framebuffer. */
 142
 143    /* Clip to destination buffer. */
 144    orig_dstx = dstx;
 145    orig_dsty = dsty;
 146    if (!_mesa_clip_to_region(fb->_Xmin, fb->_Ymin,
 147                              fb->_Xmax, fb->_Ymax,
 148                              &dstx, &dsty, &width, &height))
 149       goto out;
 150    /* Adjust src coords for our post-clipped destination origin */
 151    srcx += dstx - orig_dstx;
 152    srcy += dsty - orig_dsty;
 153
 154    /* Clip to source buffer. */
 155    orig_srcx = srcx;
 156    orig_srcy = srcy;
 157    if (!_mesa_clip_to_region(0, 0,
 158                              read_fb->Width, read_fb->Height,
 159                              &srcx, &srcy, &width, &height))
 160       goto out;
 161    /* Adjust dst coords for our post-clipped source origin */
 162    dstx += srcx - orig_srcx;
 163    dsty += srcy - orig_srcy;
 164
 165    /* Convert from GL to hardware coordinates: */
 166    if (fb->Name == 0) {
 167       /* copypixels to a system framebuffer */
 168       dsty = fb->Height - dsty - height;
 169    } else {
 170       /* copypixels to a user framebuffer object */
 171       dsty = dsty;
 172    }
 173
 174    /* Flip source Y if it's a system framebuffer. */
 175    if (read_fb->Name == 0)
 176       srcy = fb->Height - srcy - height;
 177
 178    if (!intel_region_copy(intel,
 179                           dst, 0, dstx, dsty,
 180                           src, 0, srcx, srcy,
 181                           width, height,
 182                           ctx->Color.ColorLogicOpEnabled ?
 183                           ctx->Color.LogicOp : GL_COPY)) {
 184       DBG("%s: blit failure\n", __FUNCTION__);
 185       return GL_FALSE;
 186    }
 187
 188 out:
 189    intel_check_front_buffer_rendering(intel);
 190
 191    DBG("%s: success\n", __FUNCTION__);
 192    return GL_TRUE;
 193 }
 194
 195
 196 void
 197 intelCopyPixels(GLcontext * ctx,
 198                 GLint srcx, GLint srcy,
 199                 GLsizei width, GLsizei height,
 200                 GLint destx, GLint desty, GLenum type)
 201 {
 202    if (INTEL_DEBUG & DEBUG_PIXEL)
 203       fprintf(stderr, "%s\n", __FUNCTION__);
 204
 205    if (do_blit_copypixels(ctx, srcx, srcy, width, height, destx, desty, type))
 206       return;
 207
 208    /* this will use swrast if needed */
 209    _mesa_meta_CopyPixels(ctx, srcx, srcy, width, height, destx, desty, type);
 210 }