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 "main/fbobject.h"
34#include "drivers/common/meta.h"
35
36#include "intel_context.h"
37#include "intel_buffers.h"
38#include "intel_mipmap_tree.h"
39#include "intel_regions.h"
40#include "intel_pixel.h"
41#include "intel_fbo.h"
42
43#define FILE_DEBUG_FLAG DEBUG_PIXEL
44
45/**
46 * Check if any fragment operations are in effect which might effect
47 * glCopyPixels.  Differs from intel_check_blit_fragment_ops in that
48 * we allow Scissor.
49 */
50static bool
51intel_check_copypixel_blit_fragment_ops(struct gl_context * ctx)
52{
53   if (ctx->NewState)
54      _mesa_update_state(ctx);
55
56   /* Could do logicop with the blitter:
57    */
58   return !(ctx->_ImageTransferState ||
59            ctx->Color.AlphaEnabled ||
60            ctx->Depth.Test ||
61            ctx->Fog.Enabled ||
62            ctx->Stencil._Enabled ||
63            !ctx->Color.ColorMask[0][0] ||
64            !ctx->Color.ColorMask[0][1] ||
65            !ctx->Color.ColorMask[0][2] ||
66            !ctx->Color.ColorMask[0][3] ||
67            ctx->Texture._EnabledUnits ||
68	    ctx->FragmentProgram._Enabled ||
69	    ctx->Color.BlendEnabled);
70}
71
72
73/**
74 * CopyPixels with the blitter.  Don't support zooming, pixel transfer, etc.
75 */
76static bool
77do_blit_copypixels(struct gl_context * ctx,
78                   GLint srcx, GLint srcy,
79                   GLsizei width, GLsizei height,
80                   GLint dstx, GLint dsty, GLenum type)
81{
82   struct intel_context *intel = intel_context(ctx);
83   struct gl_framebuffer *fb = ctx->DrawBuffer;
84   struct gl_framebuffer *read_fb = ctx->ReadBuffer;
85   GLint orig_dstx;
86   GLint orig_dsty;
87   GLint orig_srcx;
88   GLint orig_srcy;
89   bool flip = false;
90   struct intel_renderbuffer *draw_irb = NULL;
91   struct intel_renderbuffer *read_irb = NULL;
92   gl_format read_format, draw_format;
93
94   /* Update draw buffer bounds */
95   _mesa_update_state(ctx);
96
97   switch (type) {
98   case GL_COLOR:
99      if (fb->_NumColorDrawBuffers != 1) {
100	 fallback_debug("glCopyPixels() fallback: MRT\n");
101	 return false;
102      }
103
104      draw_irb = intel_renderbuffer(fb->_ColorDrawBuffers[0]);
105      read_irb = intel_renderbuffer(read_fb->_ColorReadBuffer);
106      break;
107   case GL_DEPTH_STENCIL_EXT:
108      draw_irb = intel_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
109      read_irb =
110	 intel_renderbuffer(read_fb->Attachment[BUFFER_DEPTH].Renderbuffer);
111      break;
112   case GL_DEPTH:
113      fallback_debug("glCopyPixels() fallback: GL_DEPTH\n");
114      return false;
115   case GL_STENCIL:
116      fallback_debug("glCopyPixels() fallback: GL_STENCIL\n");
117      return false;
118   default:
119      fallback_debug("glCopyPixels(): Unknown type\n");
120      return false;
121   }
122
123   if (!draw_irb) {
124      fallback_debug("glCopyPixels() fallback: missing draw buffer\n");
125      return false;
126   }
127
128   if (!read_irb) {
129      fallback_debug("glCopyPixels() fallback: missing read buffer\n");
130      return false;
131   }
132
133   read_format = intel_rb_format(read_irb);
134   draw_format = intel_rb_format(draw_irb);
135
136   if (draw_format != read_format &&
137       !(draw_format == MESA_FORMAT_XRGB8888 &&
138	 read_format == MESA_FORMAT_ARGB8888)) {
139      fallback_debug("glCopyPixels() fallback: mismatched formats (%s -> %s\n",
140		     _mesa_get_format_name(read_format),
141                     _mesa_get_format_name(draw_format));
142      return false;
143   }
144
145   /* Copypixels can be more than a straight copy.  Ensure all the
146    * extra operations are disabled:
147    */
148   if (!intel_check_copypixel_blit_fragment_ops(ctx) ||
149       ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F)
150      return false;
151
152   intel_prepare_render(intel);
153
154   intel_flush(&intel->ctx);
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   /* Flip dest Y if it's a window system framebuffer. */
179   if (_mesa_is_winsys_fbo(fb)) {
180      /* copypixels to a window system framebuffer */
181      dsty = fb->Height - dsty - height;
182      flip = !flip;
183   }
184
185   /* Flip source Y if it's a window system framebuffer. */
186   if (_mesa_is_winsys_fbo(read_fb)) {
187      srcy = read_fb->Height - srcy - height;
188      flip = !flip;
189   }
190
191   srcx += read_irb->draw_x;
192   srcy += read_irb->draw_y;
193   dstx += draw_irb->draw_x;
194   dsty += draw_irb->draw_y;
195
196   if (!intel_region_copy(intel,
197			  draw_irb->mt->region, 0, dstx, dsty,
198			  read_irb->mt->region, 0, srcx, srcy,
199			  width, height, flip,
200			  ctx->Color.ColorLogicOpEnabled ?
201			  ctx->Color.LogicOp : GL_COPY)) {
202      DBG("%s: blit failure\n", __FUNCTION__);
203      return false;
204   }
205
206out:
207   intel_check_front_buffer_rendering(intel);
208
209   DBG("%s: success\n", __FUNCTION__);
210   return true;
211}
212
213
214void
215intelCopyPixels(struct gl_context * ctx,
216                GLint srcx, GLint srcy,
217                GLsizei width, GLsizei height,
218                GLint destx, GLint desty, GLenum type)
219{
220   DBG("%s\n", __FUNCTION__);
221
222   if (!_mesa_check_conditional_render(ctx))
223      return;
224
225   if (do_blit_copypixels(ctx, srcx, srcy, width, height, destx, desty, type))
226      return;
227
228   /* this will use swrast if needed */
229   _mesa_meta_CopyPixels(ctx, srcx, srcy, width, height, destx, desty, type);
230}
231