1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
#include "mtypes.h"
#include "drirenderbuffer.h"
#include "renderbuffer.h"
#include "imports.h"
/**
* This will get called when a window is resized.
* Just update width, height and internal format fields for now.
* There's usually no memory allocation above because the present
* DRI drivers use statically-allocated full-screen buffers.
*/
static GLboolean
driRenderbufferStorage(GLcontext *ctx, struct gl_renderbuffer *rb,
GLenum internalFormat, GLuint width, GLuint height)
{
rb->Width = width;
rb->Height = height;
rb->InternalFormat = internalFormat;
return GL_TRUE;
}
/**
* Allocate a new driRenderbuffer object.
* Individual drivers are free to implement different versions of
* this function.
* \param format Either GL_RGBA, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24,
* GL_DEPTH_COMPONENT32, or GL_STENCIL_INDEX8_EXT (for now).
* \param cpp chars or bytes per pixel
* \param offset start of buffer with respect to framebuffer address
* \param pitch pixels per row
*/
driRenderbuffer *
driNewRenderbuffer(GLenum format, GLint cpp, GLint offset, GLint pitch)
{
driRenderbuffer *drb;
assert(format == GL_RGBA ||
format == GL_DEPTH_COMPONENT16 ||
format == GL_DEPTH_COMPONENT24 ||
format == GL_DEPTH_COMPONENT32 ||
format == GL_STENCIL_INDEX8_EXT);
assert(cpp > 0);
assert(pitch > 0);
drb = _mesa_calloc(sizeof(driRenderbuffer));
if (drb) {
const GLuint name = 0;
_mesa_init_renderbuffer(&drb->Base, name);
/* Make sure we're using a null-valued GetPointer routine */
assert(drb->Base.GetPointer(NULL, &drb->Base, 0, 0) == NULL);
drb->Base.InternalFormat = format;
if (format == GL_RGBA) {
/* Color */
drb->Base._BaseFormat = GL_RGBA;
drb->Base.DataType = GL_UNSIGNED_BYTE;
}
else if (format == GL_DEPTH_COMPONENT16) {
/* Depth */
drb->Base._BaseFormat = GL_DEPTH_COMPONENT;
/* we always Get/Put 32-bit Z values */
drb->Base.DataType = GL_UNSIGNED_INT;
}
else if (format == GL_DEPTH_COMPONENT24) {
/* Depth */
drb->Base._BaseFormat = GL_DEPTH_COMPONENT;
/* we always Get/Put 32-bit Z values */
drb->Base.DataType = GL_UNSIGNED_INT;
}
else {
/* Stencil */
ASSERT(format == GL_STENCIL_INDEX8);
drb->Base._BaseFormat = GL_STENCIL_INDEX;
drb->Base.DataType = GL_UNSIGNED_BYTE;
}
/* XXX if we were allocating a user-created renderbuffer, we'd have
* to fill in the ComponentSizes[] array too.
*/
drb->Base.AllocStorage = driRenderbufferStorage;
/* using default Delete function */
/* DRI renderbuffer-specific fields: */
drb->offset = offset;
drb->pitch = pitch;
drb->cpp = cpp;
/* may be changed if page flipping is active: */
drb->flippedOffset = offset;
drb->flippedPitch = pitch;
}
return drb;
}
/**
* Update the front and back renderbuffers' flippedPitch/Offset fields.
* This is used when we do double buffering via page flipping.
*/
void
driFlipRenderbuffers(struct gl_framebuffer *fb, GLenum flipped)
{
driRenderbuffer *front_drb
= (driRenderbuffer *) fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer;
driRenderbuffer *back_drb
= (driRenderbuffer *) fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer;
/* If this fails, it means we're trying to do page flipping for a
* single-buffered window!
*/
assert(back_drb);
if (flipped) {
front_drb->flippedOffset = back_drb->offset;
front_drb->flippedPitch = back_drb->pitch;
back_drb->flippedOffset = front_drb->offset;
back_drb->flippedPitch = front_drb->pitch;
}
else {
front_drb->flippedOffset = front_drb->offset;
front_drb->flippedPitch = front_drb->pitch;
back_drb->flippedOffset = back_drb->offset;
back_drb->flippedPitch = back_drb->pitch;
}
}
|
