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 "intel_context.h"
29#include "intel_buffers.h"
30#include "intel_fbo.h"
31#include "intel_mipmap_tree.h"
32
33#include "main/fbobject.h"
34#include "main/framebuffer.h"
35#include "main/renderbuffer.h"
36
37/**
38 * Return pointer to current color drawing region, or NULL.
39 */
40struct intel_region *
41intel_drawbuf_region(struct intel_context *intel)
42{
43   struct intel_renderbuffer *irbColor =
44      intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]);
45   if (irbColor && irbColor->mt)
46      return irbColor->mt->region;
47   else
48      return NULL;
49}
50
51/**
52 * Return pointer to current color reading region, or NULL.
53 */
54struct intel_region *
55intel_readbuf_region(struct intel_context *intel)
56{
57   struct intel_renderbuffer *irb
58      = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
59   if (irb && irb->mt)
60      return irb->mt->region;
61   else
62      return NULL;
63}
64
65/**
66 * Check if we're about to draw into the front color buffer.
67 * If so, set the intel->front_buffer_dirty field to true.
68 */
69void
70intel_check_front_buffer_rendering(struct intel_context *intel)
71{
72   const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
73   if (_mesa_is_winsys_fbo(fb)) {
74      /* drawing to window system buffer */
75      if (fb->_NumColorDrawBuffers > 0) {
76         if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
77	    intel->front_buffer_dirty = true;
78	 }
79      }
80   }
81}
82
83static void
84intelDrawBuffer(struct gl_context * ctx, GLenum mode)
85{
86   if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
87      struct intel_context *const intel = intel_context(ctx);
88      const bool was_front_buffer_rendering =
89	intel->is_front_buffer_rendering;
90
91      intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
92	|| (mode == GL_FRONT) || (mode == GL_FRONT_AND_BACK);
93
94      /* If we weren't front-buffer rendering before but we are now,
95       * invalidate our DRI drawable so we'll ask for new buffers
96       * (including the fake front) before we start rendering again.
97       */
98      if (!was_front_buffer_rendering && intel->is_front_buffer_rendering)
99	 dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
100   }
101
102   intel_draw_buffer(ctx);
103}
104
105
106static void
107intelReadBuffer(struct gl_context * ctx, GLenum mode)
108{
109   if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
110      struct intel_context *const intel = intel_context(ctx);
111      const bool was_front_buffer_reading =
112	intel->is_front_buffer_reading;
113
114      intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT)
115	|| (mode == GL_FRONT);
116
117      /* If we weren't front-buffer reading before but we are now,
118       * invalidate our DRI drawable so we'll ask for new buffers
119       * (including the fake front) before we start reading again.
120       */
121      if (!was_front_buffer_reading && intel->is_front_buffer_reading)
122	 dri2InvalidateDrawable(intel->driContext->driReadablePriv);
123   }
124}
125
126
127void
128intelInitBufferFuncs(struct dd_function_table *functions)
129{
130   functions->DrawBuffer = intelDrawBuffer;
131   functions->ReadBuffer = intelReadBuffer;
132}
133