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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* glReadPixels interface to pipe
*
* \author Brian Paul
*/
#include "main/imports.h"
#include "main/context.h"
#include "main/image.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "st_context.h"
#include "st_cb_readpixels.h"
#include "st_cb_fbo.h"
#include "st_format.h"
#include "st_public.h"
/**
* Special case for reading stencil buffer.
* For color/depth we use get_tile(). For stencil, map the stencil buffer.
*/
void
st_read_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height, GLenum type,
const struct gl_pixelstore_attrib *packing,
GLvoid *pixels)
{
struct st_context *st = ctx->st;
struct pipe_context *pipe = st->pipe;
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
struct pipe_surface *ps = strb->surface;
ubyte *stmap;
GLint j;
/* map the stencil buffer */
stmap = pipe->region_map(pipe, ps->region);
/* width should never be > MAX_WIDTH since we did clipping earlier */
ASSERT(width <= MAX_WIDTH);
/* process image row by row */
for (j = 0; j < height; j++, y++) {
GLvoid *dest;
GLstencil values[MAX_WIDTH];
GLint srcY;
if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
srcY = ctx->DrawBuffer->Height - y - 1;
}
else {
srcY = y;
}
/* get stencil values */
switch (ps->format) {
case PIPE_FORMAT_U_S8:
{
const ubyte *src = stmap + srcY * ps->region->pitch + x;
memcpy(values, src, width);
}
break;
case PIPE_FORMAT_S8_Z24:
{
const uint *src = (uint *) stmap + srcY * ps->region->pitch + x;
GLint k;
for (k = 0; k < width; k++) {
values[k] = src[k] >> 24;
}
}
break;
default:
assert(0);
}
/* store */
dest = _mesa_image_address2d(packing, pixels, width, height,
GL_STENCIL_INDEX, type, j, 0);
_mesa_pack_stencil_span(ctx, width, type, dest, values, packing);
}
/* unmap the stencil buffer */
pipe->region_unmap(pipe, ps->region);
}
/**
* Do glReadPixels by getting rows from the framebuffer surface with
* get_tile(). Convert to requested format/type with Mesa image routines.
* Image transfer ops are done in software too.
*/
static void
st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *pack,
GLvoid *dest)
{
struct pipe_context *pipe = ctx->st->pipe;
GLfloat temp[MAX_WIDTH][4];
const GLbitfield transferOps = ctx->_ImageTransferState;
GLint i, yStep, dfStride;
GLfloat *df;
struct st_renderbuffer *strb;
struct gl_pixelstore_attrib clippedPacking = *pack;
/* XXX convolution not done yet */
assert((transferOps & IMAGE_CONVOLUTION_BIT) == 0);
/* Do all needed clipping here, so that we can forget about it later */
if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
/* The ReadPixels region is totally outside the window bounds */
return;
}
/* make sure rendering has completed */
pipe->flush(pipe, 0x0);
if (pack->BufferObj && pack->BufferObj->Name) {
/* reading into a PBO */
}
else {
/* reading into user memory/buffer */
}
if (format == GL_STENCIL_INDEX) {
st_read_stencil_pixels(ctx, x, y, width, height, type, pack, dest);
return;
}
else if (format == GL_DEPTH_COMPONENT) {
strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
}
else {
strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
}
if (!strb)
return;
pipe->region_map(pipe, strb->surface->region);
if (format == GL_RGBA && type == GL_FLOAT) {
/* write tile(row) directly into user's buffer */
df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, 0, 0);
dfStride = width * 4;
}
#if 0
else if (format == GL_DEPTH_COMPONENT && type == GL_FLOAT) {
/* write tile(row) directly into user's buffer */
df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, 0, 0);
dfStride = width;
}
#endif
else {
/* write tile(row) into temp row buffer */
df = (GLfloat *) temp;
dfStride = 0;
}
/* determine bottom-to-top vs. top-to-bottom order */
if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
y = strb->Base.Height - 1 - y;
yStep = -1;
}
else {
yStep = 1;
}
/* Do a row at a time to flip image data vertically */
for (i = 0; i < height; i++) {
pipe->get_tile_rgba(pipe, strb->surface, x, y, width, 1, df);
y += yStep;
df += dfStride;
if (!dfStride) {
/* convert GLfloat to user's format/type */
GLvoid *dst = _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, i, 0);
if (format == GL_DEPTH_COMPONENT) {
_mesa_pack_depth_span(ctx, width, dst, type,
(GLfloat *) temp, &clippedPacking);
}
else {
_mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
&clippedPacking, transferOps);
}
}
}
pipe->region_unmap(pipe, strb->surface->region);
}
void st_init_readpixels_functions(struct dd_function_table *functions)
{
functions->ReadPixels = st_readpixels;
}
|
