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
|
/* Test texture swizzles */
#include <stdio.h>
#include "graw_util.h"
static struct graw_info info;
static struct pipe_resource *texture = NULL;
static struct pipe_sampler_view *sv = NULL;
static void *sampler = NULL;
static const int WIDTH = 300;
static const int HEIGHT = 300;
struct vertex {
float position[4];
float color[4];
};
static struct vertex vertices[] =
{
{ { 0.9, -0.9, 0.0, 1.0 },
{ 1, 0, 0, 1 } },
{ { 0.9, 0.9, 0.0, 1.0 },
{ 1, 1, 0, 1 } },
{ {-0.9, 0.9, 0.0, 1.0 },
{ 0, 1, 0, 1 } },
{ {-0.9, -0.9, 0.0, 1.0 },
{ 0, 0, 0, 1 } },
};
static void set_vertices(void)
{
struct pipe_vertex_element ve[2];
struct pipe_vertex_buffer vbuf;
void *handle;
memset(ve, 0, sizeof ve);
ve[0].src_offset = Offset(struct vertex, position);
ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
ve[1].src_offset = Offset(struct vertex, color);
ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
info.ctx->bind_vertex_elements_state(info.ctx, handle);
memset(&vbuf, 0, sizeof vbuf);
vbuf.stride = sizeof(struct vertex);
vbuf.buffer_offset = 0;
vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
PIPE_BIND_VERTEX_BUFFER,
PIPE_USAGE_DEFAULT,
sizeof(vertices),
vertices);
info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf);
}
static void set_vertex_shader(void)
{
void *handle;
const char *text =
"VERT\n"
"DCL IN[0]\n"
"DCL IN[1]\n"
"DCL OUT[0], POSITION\n"
"DCL OUT[1], GENERIC[0]\n"
" 0: MOV OUT[1], IN[1]\n"
" 1: MOV OUT[0], IN[0]\n"
" 2: END\n";
handle = graw_parse_vertex_shader(info.ctx, text);
info.ctx->bind_vs_state(info.ctx, handle);
}
static void set_fragment_shader(void)
{
void *handle;
const char *text =
"FRAG\n"
"DCL IN[0], GENERIC[0], PERSPECTIVE\n"
"DCL OUT[0], COLOR\n"
"DCL SAMP[0]\n"
"DCL SVIEW[0], 2D, FLOAT\n"
" 0: TXP OUT[0], IN[0], SAMP[0], 2D\n"
" 2: END\n";
handle = graw_parse_fragment_shader(info.ctx, text);
info.ctx->bind_fs_state(info.ctx, handle);
}
static void draw(void)
{
union pipe_color_union clear_color;
clear_color.f[0] = 0.5;
clear_color.f[1] = 0.5;
clear_color.f[2] = 0.5;
clear_color.f[3] = 1.0;
info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, 4);
info.ctx->flush(info.ctx, NULL, 0);
graw_util_flush_front(&info);
}
static void
init_tex(const unsigned swizzle[4])
{
#define SIZE 256
struct pipe_sampler_view sv_template;
ubyte tex2d[SIZE][SIZE][4];
int s, t;
for (s = 0; s < SIZE; s++) {
for (t = 0; t < SIZE; t++) {
tex2d[t][s][0] = 0; /*B*/
tex2d[t][s][1] = t; /*G*/
tex2d[t][s][2] = s; /*R*/
tex2d[t][s][3] = 1; /*A*/
}
}
texture = graw_util_create_tex2d(&info, SIZE, SIZE,
PIPE_FORMAT_B8G8R8A8_UNORM, tex2d);
memset(&sv_template, 0, sizeof sv_template);
sv_template.format = texture->format;
sv_template.texture = texture;
sv_template.swizzle_r = swizzle[0];
sv_template.swizzle_g = swizzle[1];
sv_template.swizzle_b = swizzle[2];
sv_template.swizzle_a = swizzle[3];
sv = info.ctx->create_sampler_view(info.ctx, texture, &sv_template);
if (sv == NULL)
exit(5);
info.ctx->set_sampler_views(info.ctx, PIPE_SHADER_FRAGMENT, 0, 1, &sv);
sampler = graw_util_create_simple_sampler(&info,
PIPE_TEX_WRAP_REPEAT,
PIPE_TEX_FILTER_NEAREST);
info.ctx->bind_sampler_states(info.ctx, PIPE_SHADER_FRAGMENT,
0, 1, &sampler);
#undef SIZE
}
static void
init(const unsigned swizzle[4])
{
if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
exit(1);
graw_util_default_state(&info, FALSE);
graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 10000);
init_tex(swizzle);
set_vertices();
set_vertex_shader();
set_fragment_shader();
}
static unsigned
char_to_swizzle(char c)
{
switch (c) {
case 'r':
return PIPE_SWIZZLE_RED;
case 'g':
return PIPE_SWIZZLE_GREEN;
case 'b':
return PIPE_SWIZZLE_BLUE;
case 'a':
return PIPE_SWIZZLE_ALPHA;
case '0':
return PIPE_SWIZZLE_ZERO;
case '1':
return PIPE_SWIZZLE_ONE;
default:
return PIPE_SWIZZLE_RED;
}
}
int main(int argc, char *argv[])
{
const char swizzle_names[] = "rgba01";
uint swizzle[4];
int i;
swizzle[0] = PIPE_SWIZZLE_RED;
swizzle[1] = PIPE_SWIZZLE_GREEN;
swizzle[2] = PIPE_SWIZZLE_BLUE;
swizzle[3] = PIPE_SWIZZLE_ALPHA;
for (i = 1; i < argc; i++) {
swizzle[i-1] = char_to_swizzle(argv[i][0]);
}
printf("Example:\n");
printf(" tex-swizzle r 0 g 1\n");
printf("Current swizzle = ");
for (i = 0; i < 4; i++) {
printf("%c", swizzle_names[swizzle[i]]);
}
printf("\n");
init(swizzle);
graw_set_display_func(draw);
graw_main_loop();
return 0;
}
|
