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
  39 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  40
  41 static struct intel_region *
  42 copypix_src_region(struct intel_context *intel, GLenum type)
  43 {
  44    switch (type) {
  45    case GL_COLOR:
  46       return intel_readbuf_region(intel);
  47    case GL_DEPTH:
  48       /* Don't think this is really possible execpt at 16bpp, when we have no stencil.
  49        */
  50       if (intel->depth_region && intel->depth_region->cpp == 2)
  51          return intel->depth_region;
  52    case GL_STENCIL:
  53       /* Don't think this is really possible.
  54        */
  55       break;
  56    case GL_DEPTH_STENCIL_EXT:
  57       /* Does it matter whether it is stencil/depth or depth/stencil?
  58        */
  59       return intel->depth_region;
  60    default:
  61       break;
  62    }
  63
  64    return NULL;
  65 }
  66
  67
  68 /**
  69  * Check if any fragment operations are in effect which might effect
  70  * glCopyPixels.  Differs from intel_check_blit_fragment_ops in that
  71  * we allow Scissor.
  72  */
  73 static GLboolean
  74 intel_check_copypixel_blit_fragment_ops(GLcontext * ctx)
  75 {
  76    if (ctx->NewState)
  77       _mesa_update_state(ctx);
  78
  79    /* Could do logicop with the blitter:
  80     */
  81    return !(ctx->_ImageTransferState ||
  82             ctx->Color.AlphaEnabled ||
  83             ctx->Depth.Test ||
  84             ctx->Fog.Enabled ||
  85             ctx->Stencil._Enabled ||
  86             !ctx->Color.ColorMask[0] ||
  87             !ctx->Color.ColorMask[1] ||
  88             !ctx->Color.ColorMask[2] ||
  89             !ctx->Color.ColorMask[3] ||
  90             ctx->Texture._EnabledUnits ||
  91             ctx->FragmentProgram._Enabled ||
  92             ctx->Color.BlendEnabled);
  93 }
  94
  95
  96 /**
  97  * CopyPixels with the blitter.  Don't support zooming, pixel transfer, etc.
  98  */
  99 static GLboolean
 100 do_blit_copypixels(GLcontext * ctx,
 101                    GLint srcx, GLint srcy,
 102                    GLsizei width, GLsizei height,
 103                    GLint dstx, GLint dsty, GLenum type)
 104 {
 105    struct intel_context *intel = intel_context(ctx);
 106    struct intel_region *dst = intel_drawbuf_region(intel);
 107    struct intel_region *src = copypix_src_region(intel, type);
 108    struct gl_framebuffer *fb = ctx->DrawBuffer;
 109    struct gl_framebuffer *read_fb = ctx->ReadBuffer;
 110    unsigned int num_cliprects;
 111    drm_clip_rect_t *cliprects;
 112    int x_off, y_off;
 113
 114    if (type == GL_DEPTH || type == GL_STENCIL) {
 115       if (INTEL_DEBUG & DEBUG_FALLBACKS)
 116          fprintf(stderr, "glCopyPixels() fallback: GL_DEPTH || GL_STENCIL\n");
 117       return GL_FALSE;
 118    }
 119
 120    /* Update draw buffer bounds */
 121    _mesa_update_state(ctx);
 122
 123    /* Copypixels can be more than a straight copy.  Ensure all the
 124     * extra operations are disabled:
 125     */
 126    if (!intel_check_copypixel_blit_fragment_ops(ctx) ||
 127        ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F)
 128       return GL_FALSE;
 129
 130    if (!src || !dst)
 131       return GL_FALSE;
 132
 133
 134
 135    intelFlush(&intel->ctx);
 136
 137    LOCK_HARDWARE(intel);
 138
 139    intel_get_cliprects(intel, &cliprects, &num_cliprects, &x_off, &y_off);
 140    if (num_cliprects != 0) {
 141       GLint delta_x;
 142       GLint delta_y;
 143       GLint orig_dstx;
 144       GLint orig_dsty;
 145       GLint orig_srcx;
 146       GLint orig_srcy;
 147       GLuint i;
 148
 149       /* XXX: We fail to handle different inversion between read and draw framebuffer. */
 150
 151       /* Clip to destination buffer. */
 152       orig_dstx = dstx;
 153       orig_dsty = dsty;
 154       if (!_mesa_clip_to_region(fb->_Xmin, fb->_Ymin,
 155                                 fb->_Xmax, fb->_Ymax,
 156                                 &dstx, &dsty, &width, &height))
 157          goto out;
 158       /* Adjust src coords for our post-clipped destination origin */
 159       srcx += dstx - orig_dstx;
 160       srcy += dsty - orig_dsty;
 161
 162       /* Clip to source buffer. */
 163       orig_srcx = srcx;
 164       orig_srcy = srcy;
 165       if (!_mesa_clip_to_region(0, 0,
 166                                 read_fb->Width, read_fb->Height,
 167                                 &srcx, &srcy, &width, &height))
 168          goto out;
 169       /* Adjust dst coords for our post-clipped source origin */
 170       dstx += srcx - orig_srcx;
 171       dsty += srcy - orig_srcy;
 172
 173       /* Convert from GL to hardware coordinates:
 174        */
 175       if (fb->Name == 0) {
 176          /* copypixels to a system framebuffer */
 177          dstx = x_off + dstx;
 178          dsty = y_off + (fb->Height - dsty - height);
 179       } else {
 180          /* copypixels to a user framebuffer object */
 181          dstx = x_off + dstx;
 182          dsty = y_off + dsty;
 183       }
 184
 185       /* Flip source Y if it's a system framebuffer. */
 186       if (read_fb->Name == 0) {
 187          srcx = intel->driReadDrawable->x + srcx;
 188          srcy = intel->driReadDrawable->y + (fb->Height - srcy - height);
 189       }
 190
 191       delta_x = srcx - dstx;
 192       delta_y = srcy - dsty;
 193       /* Could do slightly more clipping: Eg, take the intersection of
 194        * the destination cliprects and the read drawable cliprects
 195        *
 196        * This code will not overwrite other windows, but will
 197        * introduce garbage when copying from obscured window regions.
 198        */
 199       for (i = 0; i < num_cliprects; i++) {
 200          GLint clip_x = dstx;
 201          GLint clip_y = dsty;
 202          GLint clip_w = width;
 203          GLint clip_h = height;
 204
 205          if (!_mesa_clip_to_region(cliprects[i].x1, cliprects[i].y1,
 206                                    cliprects[i].x2, cliprects[i].y2,
 207                                    &clip_x, &clip_y, &clip_w, &clip_h))
 208             continue;
 209
 210          if (!intel_region_copy(intel,
 211                                 dst, 0, clip_x, clip_y,
 212                                 src, 0, clip_x + delta_x, clip_y + delta_y,
 213                                 clip_w, clip_h,
 214                                 ctx->Color.ColorLogicOpEnabled ?
 215                                 ctx->Color.LogicOp : GL_COPY)) {
 216             DBG("%s: blit failure\n", __FUNCTION__);
 217             UNLOCK_HARDWARE(intel);
 218             return GL_FALSE;
 219          }
 220       }
 221    }
 222 out:
 223    UNLOCK_HARDWARE(intel);
 224
 225    DBG("%s: success\n", __FUNCTION__);
 226    return GL_TRUE;
 227 }
 228
 229
 230 void
 231 intelCopyPixels(GLcontext * ctx,
 232                 GLint srcx, GLint srcy,
 233                 GLsizei width, GLsizei height,
 234                 GLint destx, GLint desty, GLenum type)
 235 {
 236    if (INTEL_DEBUG & DEBUG_PIXEL)
 237       fprintf(stderr, "%s\n", __FUNCTION__);
 238
 239    if (do_blit_copypixels(ctx, srcx, srcy, width, height, destx, desty, type))
 240       return;
 241
 242    /* this will use swrast if needed */
 243    _mesa_meta_CopyPixels(ctx, srcx, srcy, width, height, destx, desty, type);
 244 }