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/enums.h"
  30 #include "main/image.h"
  31 #include "main/state.h"
  32 #include "main/mtypes.h"
  33 #include "main/macros.h"
  34 #include "drivers/common/meta.h"
  35
  36 #include "intel_screen.h"
  37 #include "intel_context.h"
  38 #include "intel_batchbuffer.h"
  39 #include "intel_buffers.h"
  40 #include "intel_blit.h"
  41 #include "intel_regions.h"
  42 #include "intel_pixel.h"
  43
  44 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  45
  46 static struct intel_region *
  47 copypix_src_region(struct intel_context *intel, GLenum type)
  48 {
  49    switch (type) {
  50    case GL_COLOR:
  51       return intel_readbuf_region(intel);
  52    case GL_DEPTH:
  53       /* Don't think this is really possible execpt at 16bpp, when we have no stencil.
  54        */
  55       if (intel->depth_region && intel->depth_region->cpp == 2)
  56          return intel->depth_region;
  57    case GL_STENCIL:
  58       /* Don't think this is really possible.
  59        */
  60       break;
  61    case GL_DEPTH_STENCIL_EXT:
  62       /* Does it matter whether it is stencil/depth or depth/stencil?
  63        */
  64       return intel->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] ||
  92             !ctx->Color.ColorMask[1] ||
  93             !ctx->Color.ColorMask[2] ||
  94             !ctx->Color.ColorMask[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    unsigned int num_cliprects;
 116    drm_clip_rect_t *cliprects;
 117    int x_off, y_off;
 118
 119    if (type == GL_DEPTH || type == GL_STENCIL) {
 120       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 121          fprintf(stderr, "glCopyPixels() fallback: GL_DEPTH || GL_STENCIL\n");
 122       return GL_FALSE;
 123    }
 124
 125    /* Update draw buffer bounds */
 126    _mesa_update_state(ctx);
 127
 128    /* Copypixels can be more than a straight copy.  Ensure all the
 129     * extra operations are disabled:
 130     */
 131    if (!intel_check_copypixel_blit_fragment_ops(ctx) ||
 132        ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F)
 133       return GL_FALSE;
 134
 135    if (!src || !dst)
 136       return GL_FALSE;
 137
 138
 139
 140    intelFlush(&intel->ctx);
 141
 142    LOCK_HARDWARE(intel);
 143
 144    intel_get_cliprects(intel, &cliprects, &num_cliprects, &x_off, &y_off);
 145    if (num_cliprects != 0) {
 146       GLint delta_x;
 147       GLint delta_y;
 148       GLint orig_dstx;
 149       GLint orig_dsty;
 150       GLint orig_srcx;
 151       GLint orig_srcy;
 152       GLuint i;
 153
 154       /* XXX: We fail to handle different inversion between read and draw framebuffer. */
 155
 156       /* Clip to destination buffer. */
 157       orig_dstx = dstx;
 158       orig_dsty = dsty;
 159       if (!_mesa_clip_to_region(fb->_Xmin, fb->_Ymin,
 160                                 fb->_Xmax, fb->_Ymax,
 161                                 &dstx, &dsty, &width, &height))
 162          goto out;
 163       /* Adjust src coords for our post-clipped destination origin */
 164       srcx += dstx - orig_dstx;
 165       srcy += dsty - orig_dsty;
 166
 167       /* Clip to source buffer. */
 168       orig_srcx = srcx;
 169       orig_srcy = srcy;
 170       if (!_mesa_clip_to_region(0, 0,
 171                                 read_fb->Width, read_fb->Height,
 172                                 &srcx, &srcy, &width, &height))
 173          goto out;
 174       /* Adjust dst coords for our post-clipped source origin */
 175       dstx += srcx - orig_srcx;
 176       dsty += srcy - orig_srcy;
 177
 178       /* Convert from GL to hardware coordinates:
 179        */
 180       if (fb->Name == 0) {
 181          /* copypixels to a system framebuffer */
 182          dstx = x_off + dstx;
 183          dsty = y_off + (fb->Height - dsty - height);
 184       } else {
 185          /* copypixels to a user framebuffer object */
 186          dstx = x_off + dstx;
 187          dsty = y_off + dsty;
 188       }
 189
 190       /* Flip source Y if it's a system framebuffer. */
 191       if (read_fb->Name == 0) {
 192          srcx = intel->driReadDrawable->x + srcx;
 193          srcy = intel->driReadDrawable->y + (fb->Height - srcy - height);
 194       }
 195
 196       delta_x = srcx - dstx;
 197       delta_y = srcy - dsty;
 198       /* Could do slightly more clipping: Eg, take the intersection of
 199        * the destination cliprects and the read drawable cliprects
 200        *
 201        * This code will not overwrite other windows, but will
 202        * introduce garbage when copying from obscured window regions.
 203        */
 204       for (i = 0; i < num_cliprects; i++) {
 205          GLint clip_x = dstx;
 206          GLint clip_y = dsty;
 207          GLint clip_w = width;
 208          GLint clip_h = height;
 209
 210          if (!_mesa_clip_to_region(cliprects[i].x1, cliprects[i].y1,
 211                                    cliprects[i].x2, cliprects[i].y2,
 212                                    &clip_x, &clip_y, &clip_w, &clip_h))
 213             continue;
 214
 215          if (!intel_region_copy(intel,
 216                                 dst, 0, clip_x, clip_y,
 217                                 src, 0, clip_x + delta_x, clip_y + delta_y,
 218                                 clip_w, clip_h,
 219                                 ctx->Color.ColorLogicOpEnabled ?
 220                                 ctx->Color.LogicOp : GL_COPY)) {
 221             DBG("%s: blit failure\n", __FUNCTION__);
 222             UNLOCK_HARDWARE(intel);
 223             return GL_FALSE;
 224          }
 225       }
 226    }
 227 out:
 228    UNLOCK_HARDWARE(intel);
 229
 230    DBG("%s: success\n", __FUNCTION__);
 231    return GL_TRUE;
 232 }
 233
 234
 235 void
 236 intelCopyPixels(GLcontext * ctx,
 237                 GLint srcx, GLint srcy,
 238                 GLsizei width, GLsizei height,
 239                 GLint destx, GLint desty, GLenum type)
 240 {
 241    if (INTEL_DEBUG & DEBUG_PIXEL)
 242       fprintf(stderr, "%s\n", __FUNCTION__);
 243
 244    if (do_blit_copypixels(ctx, srcx, srcy, width, height, destx, desty, type))
 245       return;
 246
 247    _mesa_meta_copy_pixels(ctx, srcx, srcy, width, height, destx, desty, type);
 248 }