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 "main/condrender.h"
  33 #include "drivers/common/meta.h"
  34
  35 #include "intel_context.h"
  36 #include "intel_buffers.h"
  37 #include "intel_regions.h"
  38 #include "intel_pixel.h"
  39 #include "intel_fbo.h"
  40
  41 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  42
  43 static struct intel_region *
  44 copypix_src_region(struct intel_context *intel, GLenum type)
  45 {
  46    struct intel_renderbuffer *depth;
  47
  48    depth = (struct intel_renderbuffer *)
  49       &intel->ctx.DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
  50
  51    switch (type) {
  52    case GL_COLOR:
  53       return intel_readbuf_region(intel);
  54    case GL_DEPTH:
  55       /* Don't think this is really possible execpt at 16bpp, when we
  56        * have no stencil. */
  57       if (depth && depth->region->cpp == 2)
  58          return depth->region;
  59    case GL_STENCIL:
  60       /* Don't think this is really possible. */
  61       break;
  62    case GL_DEPTH_STENCIL_EXT:
  63       /* Does it matter whether it is stencil/depth or depth/stencil?
  64        */
  65       return depth->region;
  66    default:
  67       break;
  68    }
  69
  70    return NULL;
  71 }
  72
  73
  74 /**
  75  * Check if any fragment operations are in effect which might effect
  76  * glCopyPixels.  Differs from intel_check_blit_fragment_ops in that
  77  * we allow Scissor.
  78  */
  79 static GLboolean
  80 intel_check_copypixel_blit_fragment_ops(struct gl_context * ctx)
  81 {
  82    if (ctx->NewState)
  83       _mesa_update_state(ctx);
  84
  85    /* Could do logicop with the blitter:
  86     */
  87    return !(ctx->_ImageTransferState ||
  88             ctx->Color.AlphaEnabled ||
  89             ctx->Depth.Test ||
  90             ctx->Fog.Enabled ||
  91             ctx->Stencil._Enabled ||
  92             !ctx->Color.ColorMask[0][0] ||
  93             !ctx->Color.ColorMask[0][1] ||
  94             !ctx->Color.ColorMask[0][2] ||
  95             !ctx->Color.ColorMask[0][3] ||
  96             ctx->Texture._EnabledUnits ||
  97             ctx->FragmentProgram._Enabled ||
  98             ctx->Color.BlendEnabled);
  99 }
 100
 101
 102 /**
 103  * CopyPixels with the blitter.  Don't support zooming, pixel transfer, etc.
 104  */
 105 static GLboolean
 106 do_blit_copypixels(struct gl_context * ctx,
 107                    GLint srcx, GLint srcy,
 108                    GLsizei width, GLsizei height,
 109                    GLint dstx, GLint dsty, GLenum type)
 110 {
 111    struct intel_context *intel = intel_context(ctx);
 112    struct intel_region *dst;
 113    struct intel_region *src;
 114    struct gl_framebuffer *fb = ctx->DrawBuffer;
 115    struct gl_framebuffer *read_fb = ctx->ReadBuffer;
 116    GLint orig_dstx;
 117    GLint orig_dsty;
 118    GLint orig_srcx;
 119    GLint orig_srcy;
 120    GLboolean flip = GL_FALSE;
 121
 122    if (type == GL_DEPTH || type == GL_STENCIL) {
 123       fallback_debug("glCopyPixels() fallback: GL_DEPTH || GL_STENCIL\n");
 124       return GL_FALSE;
 125    }
 126
 127    /* Update draw buffer bounds */
 128    _mesa_update_state(ctx);
 129
 130    /* Copypixels can be more than a straight copy.  Ensure all the
 131     * extra operations are disabled:
 132     */
 133    if (!intel_check_copypixel_blit_fragment_ops(ctx) ||
 134        ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F)
 135       return GL_FALSE;
 136
 137    intel_prepare_render(intel);
 138
 139    dst = intel_drawbuf_region(intel);
 140    src = copypix_src_region(intel, type);
 141
 142    if (!src || !dst)
 143       return GL_FALSE;
 144
 145    intel_flush(&intel->ctx);
 146
 147    /* Clip to destination buffer. */
 148    orig_dstx = dstx;
 149    orig_dsty = dsty;
 150    if (!_mesa_clip_to_region(fb->_Xmin, fb->_Ymin,
 151                              fb->_Xmax, fb->_Ymax,
 152                              &dstx, &dsty, &width, &height))
 153       goto out;
 154    /* Adjust src coords for our post-clipped destination origin */
 155    srcx += dstx - orig_dstx;
 156    srcy += dsty - orig_dsty;
 157
 158    /* Clip to source buffer. */
 159    orig_srcx = srcx;
 160    orig_srcy = srcy;
 161    if (!_mesa_clip_to_region(0, 0,
 162                              read_fb->Width, read_fb->Height,
 163                              &srcx, &srcy, &width, &height))
 164       goto out;
 165    /* Adjust dst coords for our post-clipped source origin */
 166    dstx += srcx - orig_srcx;
 167    dsty += srcy - orig_srcy;
 168
 169    /* Flip dest Y if it's a window system framebuffer. */
 170    if (fb->Name == 0) {
 171       /* copypixels to a window system framebuffer */
 172       dsty = fb->Height - dsty - height;
 173       flip = !flip;
 174    }
 175
 176    /* Flip source Y if it's a window system framebuffer. */
 177    if (read_fb->Name == 0) {
 178       srcy = read_fb->Height - srcy - height;
 179       flip = !flip;
 180    }
 181
 182    if (!intel_region_copy(intel,
 183                           dst, 0, dstx, dsty,
 184                           src, 0, srcx, srcy,
 185                           width, height, flip,
 186                           ctx->Color.ColorLogicOpEnabled ?
 187                           ctx->Color.LogicOp : GL_COPY)) {
 188       DBG("%s: blit failure\n", __FUNCTION__);
 189       return GL_FALSE;
 190    }
 191
 192 out:
 193    intel_check_front_buffer_rendering(intel);
 194
 195    DBG("%s: success\n", __FUNCTION__);
 196    return GL_TRUE;
 197 }
 198
 199
 200 void
 201 intelCopyPixels(struct gl_context * ctx,
 202                 GLint srcx, GLint srcy,
 203                 GLsizei width, GLsizei height,
 204                 GLint destx, GLint desty, GLenum type)
 205 {
 206    DBG("%s\n", __FUNCTION__);
 207
 208    if (!_mesa_check_conditional_render(ctx))
 209       return;
 210
 211    if (do_blit_copypixels(ctx, srcx, srcy, width, height, destx, desty, type))
 212       return;
 213
 214    /* this will use swrast if needed */
 215    _mesa_meta_CopyPixels(ctx, srcx, srcy, width, height, destx, desty, type);
 216 }