1 /**************************************************************************
3 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
28 #include "intel_context.h"
29 #include "intel_buffers.h"
30 #include "intel_fbo.h"
32 #include "main/framebuffer.h"
33 #include "main/renderbuffer.h"
36 * Return pointer to current color drawing region, or NULL.
39 intel_drawbuf_region(struct intel_context *intel)
41 struct intel_renderbuffer *irbColor =
42 intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]);
44 return irbColor->region;
50 * Return pointer to current color reading region, or NULL.
53 intel_readbuf_region(struct intel_context *intel)
55 struct intel_renderbuffer *irb
56 = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
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.
68 intel_check_front_buffer_rendering(struct intel_context *intel)
70 const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
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;
82 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
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;
89 intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
90 || (mode == GL_FRONT);
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.
96 if (!was_front_buffer_rendering && intel->is_front_buffer_rendering)
97 dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
100 intel_draw_buffer(ctx, ctx->DrawBuffer);
105 intelReadBuffer(struct gl_context * ctx, GLenum mode)
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;
112 intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT)
113 || (mode == GL_FRONT);
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.
119 if (!was_front_buffer_reading && intel->is_front_buffer_reading)
120 dri2InvalidateDrawable(intel->driContext->driReadablePriv);
126 intelInitBufferFuncs(struct dd_function_table *functions)
128 functions->DrawBuffer = intelDrawBuffer;
129 functions->ReadBuffer = intelReadBuffer;