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 simple_mtx_init(&rb->Mutex, mtx_plain);
44
45 rb->ClassID = 0;
46 rb->Name = name;
47 rb->RefCount = 1;
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_gles(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 simple_mtx_destroy(&rb->Mutex);
105 free(rb->Label);
106 free(rb);
107 }
108
109 static void
validate_and_init_renderbuffer_attachment(struct gl_framebuffer * fb,gl_buffer_index bufferName,struct gl_renderbuffer * rb)110 validate_and_init_renderbuffer_attachment(struct gl_framebuffer *fb,
111 gl_buffer_index bufferName,
112 struct gl_renderbuffer *rb)
113 {
114 assert(fb);
115 assert(rb);
116 assert(bufferName < BUFFER_COUNT);
117
118 /* There should be no previous renderbuffer on this attachment point,
119 * with the exception of depth/stencil since the same renderbuffer may
120 * be used for both.
121 */
122 assert(bufferName == BUFFER_DEPTH ||
123 bufferName == BUFFER_STENCIL ||
124 fb->Attachment[bufferName].Renderbuffer == NULL);
125
126 /* winsys vs. user-created buffer cross check */
127 if (_mesa_is_user_fbo(fb)) {
128 assert(rb->Name);
129 }
130 else {
131 assert(!rb->Name);
132 }
133
134 fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
135 fb->Attachment[bufferName].Complete = GL_TRUE;
136 }
137
138
139 /**
140 * Attach a renderbuffer to a framebuffer.
141 * \param bufferName one of the BUFFER_x tokens
142 *
143 * This function avoids adding a reference and is therefore intended to be
144 * used with a freshly created renderbuffer.
145 */
146 void
_mesa_attach_and_own_rb(struct gl_framebuffer * fb,gl_buffer_index bufferName,struct gl_renderbuffer * rb)147 _mesa_attach_and_own_rb(struct gl_framebuffer *fb,
148 gl_buffer_index bufferName,
149 struct gl_renderbuffer *rb)
150 {
151 assert(rb->RefCount == 1);
152
153 validate_and_init_renderbuffer_attachment(fb, bufferName, rb);
154
155 _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
156 NULL);
157 fb->Attachment[bufferName].Renderbuffer = rb;
158 }
159
160 /**
161 * Attach a renderbuffer to a framebuffer.
162 * \param bufferName one of the BUFFER_x tokens
163 */
164 void
_mesa_attach_and_reference_rb(struct gl_framebuffer * fb,gl_buffer_index bufferName,struct gl_renderbuffer * rb)165 _mesa_attach_and_reference_rb(struct gl_framebuffer *fb,
166 gl_buffer_index bufferName,
167 struct gl_renderbuffer *rb)
168 {
169 validate_and_init_renderbuffer_attachment(fb, bufferName, rb);
170 _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
171 }
172
173
174 /**
175 * Remove the named renderbuffer from the given framebuffer.
176 * \param bufferName one of the BUFFER_x tokens
177 */
178 void
_mesa_remove_renderbuffer(struct gl_framebuffer * fb,gl_buffer_index bufferName)179 _mesa_remove_renderbuffer(struct gl_framebuffer *fb,
180 gl_buffer_index bufferName)
181 {
182 assert(bufferName < BUFFER_COUNT);
183 _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer,
184 NULL);
185 }
186
187
188 /**
189 * Set *ptr to point to rb. If *ptr points to another renderbuffer,
190 * dereference that buffer first. The new renderbuffer's refcount will
191 * be incremented. The old renderbuffer's refcount will be decremented.
192 * This is normally only called from the _mesa_reference_renderbuffer() macro
193 * when there's a real pointer change.
194 */
195 void
_mesa_reference_renderbuffer_(struct gl_renderbuffer ** ptr,struct gl_renderbuffer * rb)196 _mesa_reference_renderbuffer_(struct gl_renderbuffer **ptr,
197 struct gl_renderbuffer *rb)
198 {
199 if (*ptr) {
200 /* Unreference the old renderbuffer */
201 GLboolean deleteFlag = GL_FALSE;
202 struct gl_renderbuffer *oldRb = *ptr;
203
204 simple_mtx_lock(&oldRb->Mutex);
205 assert(oldRb->RefCount > 0);
206 oldRb->RefCount--;
207 deleteFlag = (oldRb->RefCount == 0);
208 simple_mtx_unlock(&oldRb->Mutex);
209
210 if (deleteFlag) {
211 GET_CURRENT_CONTEXT(ctx);
212 oldRb->Delete(ctx, oldRb);
213 }
214
215 *ptr = NULL;
216 }
217 assert(!*ptr);
218
219 if (rb) {
220 /* reference new renderbuffer */
221 simple_mtx_lock(&rb->Mutex);
222 rb->RefCount++;
223 simple_mtx_unlock(&rb->Mutex);
224 *ptr = rb;
225 }
226 }
227