1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2006 Brian Paul 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 "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26 #include "glheader.h"
27 #include "imports.h"
28 #include "context.h"
29 #include "fbobject.h"
30 #include "formats.h"
31 #include "mtypes.h"
32 #include "renderbuffer.h"
33
34
35 /**
36 * Initialize the fields of a gl_renderbuffer to default values.
37 */
38 void
_mesa_init_renderbuffer(struct gl_renderbuffer * rb,GLuint name)39 _mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
40 {
41 GET_CURRENT_CONTEXT(ctx);
42
43 mtx_init(&rb->Mutex, mtx_plain);
44
45 rb->ClassID = 0;
46 rb->Name = name;
47 rb->RefCount = 0;
48 rb->Delete = _mesa_delete_renderbuffer;
49
50 /* The rest of these should be set later by the caller of this function or
51 * the AllocStorage method:
52 */
53 rb->AllocStorage = NULL;
54
55 rb->Width = 0;
56 rb->Height = 0;
57 rb->Depth = 0;
58
59 /* In GL 3, the initial format is GL_RGBA according to Table 6.26
60 * on page 302 of the GL 3.3 spec.
61 *
62 * In GLES 3, the initial format is GL_RGBA4 according to Table 6.15
63 * on page 258 of the GLES 3.0.4 spec.
64 *
65 * If the context is current, set the initial format based on the
66 * specs. If the context is not current, we cannot determine the
67 * API, so default to GL_RGBA.
68 */
69 if (ctx && _mesa_is_gles3(ctx)) {
70 rb->InternalFormat = GL_RGBA4;
71 } else {
72 rb->InternalFormat = GL_RGBA;
73 }
74
75 rb->Format = MESA_FORMAT_NONE;
76 }
77
78
79 /**
80 * Allocate a new gl_renderbuffer object. This can be used for user-created
81 * renderbuffers or window-system renderbuffers.
82 */
83 struct gl_renderbuffer *
_mesa_new_renderbuffer(struct gl_context * ctx,GLuint name)84 _mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)
85 {
86 struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
87 if (rb) {
88 _mesa_init_renderbuffer(rb, name);
89 }
90 return rb;
91 }
92
93
94 /**
95 * Delete a gl_framebuffer.
96 * This is the default function for renderbuffer->Delete().
97 * Drivers which subclass gl_renderbuffer should probably implement their
98 * own delete function. But the driver might also call this function to
99 * free the object in the end.
100 */
101 void
_mesa_delete_renderbuffer(struct gl_context * ctx,struct gl_renderbuffer * rb)102 _mesa_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
103 {
104 mtx_destroy(&rb->Mutex);
105 free(rb->Label);
106 free(rb);
107 }
108
109
110 /**
111 * Attach a renderbuffer to a framebuffer.
112 * \param bufferName one of the BUFFER_x tokens
113 */
114 void
_mesa_add_renderbuffer(struct gl_framebuffer * fb,gl_buffer_index bufferName,struct gl_renderbuffer * rb)115 _mesa_add_renderbuffer(struct gl_framebuffer *fb,
116 gl_buffer_index bufferName, struct gl_renderbuffer *rb)
117 {
118 assert(fb);
119 assert(rb);
120 assert(bufferName < BUFFER_COUNT);
121
122 /* There should be no previous renderbuffer on this attachment point,
123 * with the exception of depth/stencil since the same renderbuffer may
124 * be used for both.
125 */
126 assert(bufferName == BUFFER_DEPTH ||
127 bufferName == BUFFER_STENCIL ||
128 fb->Attachment[bufferName].Renderbuffer == NULL);
129
130 /* winsys vs. user-created buffer cross check */
131 if (_mesa_is_user_fbo(fb)) {
132 assert(rb->Name);
133 }
134 else {
135 assert(!rb->Name);
136 }
137
138 fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
139 fb->Attachment[bufferName].Complete = GL_TRUE;
140 _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
141 }
142
143
144 /**
145 * Remove the named renderbuffer from the given framebuffer.
146 * \param bufferName one of the BUFFER_x tokens
147 */
148 void
_mesa_remove_renderbuffer(struct gl_framebuffer * fb,gl_buffer_index bufferName)149 _mesa_remove_renderbuffer(struct gl_framebuffer *fb,
150 gl_buffer_index bufferName)
151 {
152 assert(bufferName < BUFFER_COUNT);
153 _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
154 NULL);
155 }
156
157
158 /**
159 * Set *ptr to point to rb. If *ptr points to another renderbuffer,
160 * dereference that buffer first. The new renderbuffer's refcount will
161 * be incremented. The old renderbuffer's refcount will be decremented.
162 * This is normally only called from the _mesa_reference_renderbuffer() macro
163 * when there's a real pointer change.
164 */
165 void
_mesa_reference_renderbuffer_(struct gl_renderbuffer ** ptr,struct gl_renderbuffer * rb)166 _mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
167 struct gl_renderbuffer *rb)
168 {
169 if (*ptr) {
170 /* Unreference the old renderbuffer */
171 GLboolean deleteFlag = GL_FALSE;
172 struct gl_renderbuffer *oldRb = *ptr;
173
174 mtx_lock(&oldRb->Mutex);
175 assert(oldRb->RefCount > 0);
176 oldRb->RefCount--;
177 deleteFlag = (oldRb->RefCount == 0);
178 mtx_unlock(&oldRb->Mutex);
179
180 if (deleteFlag) {
181 GET_CURRENT_CONTEXT(ctx);
182 oldRb->Delete(ctx, oldRb);
183 }
184
185 *ptr = NULL;
186 }
187 assert(!*ptr);
188
189 if (rb) {
190 /* reference new renderbuffer */
191 mtx_lock(&rb->Mutex);
192 rb->RefCount++;
193 mtx_unlock(&rb->Mutex);
194 *ptr = rb;
195 }
196 }
197