1 /**************************************************************************
2 *
3 * Copyright 2003 VMware, Inc.
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 VMWARE 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 * Check if we're about to draw into the front color buffer.
39 * If so, set the intel->front_buffer_dirty field to true.
40 */
41 void
intel_check_front_buffer_rendering(struct intel_context * intel)42 intel_check_front_buffer_rendering(struct intel_context *intel)
43 {
44 const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
45 if (_mesa_is_winsys_fbo(fb)) {
46 /* drawing to window system buffer */
47 if (fb->_NumColorDrawBuffers > 0) {
48 if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
49 intel->front_buffer_dirty = true;
50 }
51 }
52 }
53 }
54
55 static void
intelDrawBuffer(struct gl_context * ctx,GLenum mode)56 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
57 {
58 if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer)) {
59 struct intel_context *const intel = intel_context(ctx);
60
61 /* If we might be front-buffer rendering on this buffer for the first
62 * time, invalidate our DRI drawable so we'll ask for new buffers
63 * (including the fake front) before we start rendering again.
64 */
65 dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
66 }
67
68 intel_draw_buffer(ctx);
69 }
70
71
72 static void
intelReadBuffer(struct gl_context * ctx,GLenum mode)73 intelReadBuffer(struct gl_context * ctx, GLenum mode)
74 {
75 if (_mesa_is_front_buffer_reading(ctx->ReadBuffer)) {
76 struct intel_context *const intel = intel_context(ctx);
77
78 /* If we might be front-buffer reading on this buffer for the first
79 * time, invalidate our DRI drawable so we'll ask for new buffers
80 * (including the fake front) before we start reading again.
81 */
82 dri2InvalidateDrawable(intel->driContext->driReadablePriv);
83 }
84 }
85
86
87 void
intelInitBufferFuncs(struct dd_function_table * functions)88 intelInitBufferFuncs(struct dd_function_table *functions)
89 {
90 functions->DrawBuffer = intelDrawBuffer;
91 functions->ReadBuffer = intelReadBuffer;
92 }
93