intel_buffers.c revision f34ec6169dc8b96e3958a42b51c9048c5f42ed80 
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
32#include "main/framebuffer.h"
33#include "main/renderbuffer.h"
34
35/**
36 * Return pointer to current color drawing region, or NULL.
37 */
38struct intel_region *
39intel_drawbuf_region(struct intel_context *intel)
40{
41   struct intel_renderbuffer *irbColor =
42      intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]);
43   if (irbColor)
44      return irbColor->region;
45   else
46      return NULL;
47}
48
49/**
50 * Return pointer to current color reading region, or NULL.
51 */
52struct intel_region *
53intel_readbuf_region(struct intel_context *intel)
54{
55   struct intel_renderbuffer *irb
56      = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
57   if (irb)
58      return irb->region;
59   else
60      return NULL;
61}
62
63/**
64 * Check if we're about to draw into the front color buffer.
65 * If so, set the intel->front_buffer_dirty field to true.
66 */
67void
68intel_check_front_buffer_rendering(struct intel_context *intel)
69{
70   const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
71   if (fb->Name == 0) {
72      /* drawing to window system buffer */
73      if (fb->_NumColorDrawBuffers > 0) {
74         if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
75	    intel->front_buffer_dirty = GL_TRUE;
76	 }
77      }
78   }
79}
80
81static void
82intelDrawBuffer(struct gl_context * ctx, GLenum mode)
83{
84   if ((ctx->DrawBuffer != NULL) && (ctx->DrawBuffer->Name == 0)) {
85      struct intel_context *const intel = intel_context(ctx);
86      const GLboolean was_front_buffer_rendering =
87	intel->is_front_buffer_rendering;
88
89      intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
90	|| (mode == GL_FRONT);
91
92      /* If we weren't front-buffer rendering before but we are now,
93       * invalidate our DRI drawable so we'll ask for new buffers
94       * (including the fake front) before we start rendering again.
95       */
96      if (!was_front_buffer_rendering && intel->is_front_buffer_rendering)
97	 dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
98   }
99
100   intel_draw_buffer(ctx, ctx->DrawBuffer);
101}
102
103
104static void
105intelReadBuffer(struct gl_context * ctx, GLenum mode)
106{
107   if ((ctx->DrawBuffer != NULL) && (ctx->DrawBuffer->Name == 0)) {
108      struct intel_context *const intel = intel_context(ctx);
109      const GLboolean was_front_buffer_reading =
110	intel->is_front_buffer_reading;
111
112      intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT)
113	|| (mode == GL_FRONT);
114
115      /* If we weren't front-buffer reading before but we are now,
116       * invalidate our DRI drawable so we'll ask for new buffers
117       * (including the fake front) before we start reading again.
118       */
119      if (!was_front_buffer_reading && intel->is_front_buffer_reading)
120	 dri2InvalidateDrawable(intel->driContext->driReadablePriv);
121   }
122}
123
124
125void
126intelInitBufferFuncs(struct dd_function_table *functions)
127{
128   functions->DrawBuffer = intelDrawBuffer;
129   functions->ReadBuffer = intelReadBuffer;
130}
131