2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
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.
32 #include "renderbuffer.h"
36 * Initialize the fields of a gl_renderbuffer to default values.
39 _mesa_init_renderbuffer(struct gl_renderbuffer
*rb
, GLuint name
)
41 GET_CURRENT_CONTEXT(ctx
);
43 simple_mtx_init(&rb
->Mutex
, mtx_plain
);
48 rb
->Delete
= _mesa_delete_renderbuffer
;
50 /* The rest of these should be set later by the caller of this function or
51 * the AllocStorage method:
53 rb
->AllocStorage
= NULL
;
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.
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.
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.
69 if (ctx
&& _mesa_is_gles(ctx
)) {
70 rb
->InternalFormat
= GL_RGBA4
;
72 rb
->InternalFormat
= GL_RGBA
;
75 rb
->Format
= MESA_FORMAT_NONE
;
80 * Allocate a new gl_renderbuffer object. This can be used for user-created
81 * renderbuffers or window-system renderbuffers.
83 struct gl_renderbuffer
*
84 _mesa_new_renderbuffer(struct gl_context
*ctx
, GLuint name
)
86 struct gl_renderbuffer
*rb
= CALLOC_STRUCT(gl_renderbuffer
);
88 _mesa_init_renderbuffer(rb
, name
);
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.
102 _mesa_delete_renderbuffer(struct gl_context
*ctx
, struct gl_renderbuffer
*rb
)
104 simple_mtx_destroy(&rb
->Mutex
);
110 validate_and_init_renderbuffer_attachment(struct gl_framebuffer
*fb
,
111 gl_buffer_index bufferName
,
112 struct gl_renderbuffer
*rb
)
116 assert(bufferName
< BUFFER_COUNT
);
118 /* There should be no previous renderbuffer on this attachment point,
119 * with the exception of depth/stencil since the same renderbuffer may
122 assert(bufferName
== BUFFER_DEPTH
||
123 bufferName
== BUFFER_STENCIL
||
124 fb
->Attachment
[bufferName
].Renderbuffer
== NULL
);
126 /* winsys vs. user-created buffer cross check */
127 if (_mesa_is_user_fbo(fb
)) {
134 fb
->Attachment
[bufferName
].Type
= GL_RENDERBUFFER_EXT
;
135 fb
->Attachment
[bufferName
].Complete
= GL_TRUE
;
140 * Attach a renderbuffer to a framebuffer.
141 * \param bufferName one of the BUFFER_x tokens
143 * This function avoids adding a reference and is therefore intended to be
144 * used with a freshly created renderbuffer.
147 _mesa_attach_and_own_rb(struct gl_framebuffer
*fb
,
148 gl_buffer_index bufferName
,
149 struct gl_renderbuffer
*rb
)
151 assert(rb
->RefCount
== 1);
153 validate_and_init_renderbuffer_attachment(fb
, bufferName
, rb
);
155 _mesa_reference_renderbuffer(&fb
->Attachment
[bufferName
].Renderbuffer
,
157 fb
->Attachment
[bufferName
].Renderbuffer
= rb
;
161 * Attach a renderbuffer to a framebuffer.
162 * \param bufferName one of the BUFFER_x tokens
165 _mesa_attach_and_reference_rb(struct gl_framebuffer
*fb
,
166 gl_buffer_index bufferName
,
167 struct gl_renderbuffer
*rb
)
169 validate_and_init_renderbuffer_attachment(fb
, bufferName
, rb
);
170 _mesa_reference_renderbuffer(&fb
->Attachment
[bufferName
].Renderbuffer
, rb
);
175 * Remove the named renderbuffer from the given framebuffer.
176 * \param bufferName one of the BUFFER_x tokens
179 _mesa_remove_renderbuffer(struct gl_framebuffer
*fb
,
180 gl_buffer_index bufferName
)
182 assert(bufferName
< BUFFER_COUNT
);
183 _mesa_reference_renderbuffer(&fb
->Attachment
[bufferName
].Renderbuffer
,
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.
196 _mesa_reference_renderbuffer_(struct gl_renderbuffer
**ptr
,
197 struct gl_renderbuffer
*rb
)
200 /* Unreference the old renderbuffer */
201 GLboolean deleteFlag
= GL_FALSE
;
202 struct gl_renderbuffer
*oldRb
= *ptr
;
204 simple_mtx_lock(&oldRb
->Mutex
);
205 assert(oldRb
->RefCount
> 0);
207 deleteFlag
= (oldRb
->RefCount
== 0);
208 simple_mtx_unlock(&oldRb
->Mutex
);
211 GET_CURRENT_CONTEXT(ctx
);
212 oldRb
->Delete(ctx
, oldRb
);
220 /* reference new renderbuffer */
221 simple_mtx_lock(&rb
->Mutex
);
223 simple_mtx_unlock(&rb
->Mutex
);