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1 /* Test texture swizzles */
2 
3 #include <stdio.h>
4 
5 #include "graw_util.h"
6 
7 
8 static struct graw_info info;
9 
10 static struct pipe_resource *texture = NULL;
11 static struct pipe_sampler_view *sv = NULL;
12 static void *sampler = NULL;
13 
14 static const int WIDTH = 300;
15 static const int HEIGHT = 300;
16 
17 struct vertex {
18    float position[4];
19    float color[4];
20 };
21 
22 static struct vertex vertices[] =
23 {
24    { { 0.9, -0.9, 0.0, 1.0 },
25      { 1, 0, 0, 1 } },
26 
27    { { 0.9,  0.9, 0.0, 1.0 },
28      { 1, 1, 0, 1 } },
29 
30    { {-0.9,  0.9, 0.0, 1.0 },
31      { 0, 1, 0, 1 } },
32 
33    { {-0.9,  -0.9, 0.0, 1.0 },
34      { 0, 0, 0, 1 } },
35 };
36 
37 
set_vertices(void)38 static void set_vertices(void)
39 {
40    struct pipe_vertex_element ve[2];
41    struct pipe_vertex_buffer vbuf;
42    void *handle;
43 
44    memset(ve, 0, sizeof ve);
45 
46    ve[0].src_offset = Offset(struct vertex, position);
47    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
48    ve[1].src_offset = Offset(struct vertex, color);
49    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
50 
51    handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
52    info.ctx->bind_vertex_elements_state(info.ctx, handle);
53 
54 
55    vbuf.stride = sizeof(struct vertex);
56    vbuf.buffer_offset = 0;
57    vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
58                                               PIPE_BIND_VERTEX_BUFFER,
59                                               PIPE_USAGE_STATIC,
60                                               sizeof(vertices),
61                                               vertices);
62 
63    info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
64 }
65 
set_vertex_shader(void)66 static void set_vertex_shader(void)
67 {
68    void *handle;
69    const char *text =
70       "VERT\n"
71       "DCL IN[0]\n"
72       "DCL IN[1]\n"
73       "DCL OUT[0], POSITION\n"
74       "DCL OUT[1], GENERIC[0]\n"
75       "  0: MOV OUT[1], IN[1]\n"
76       "  1: MOV OUT[0], IN[0]\n"
77       "  2: END\n";
78 
79    handle = graw_parse_vertex_shader(info.ctx, text);
80    info.ctx->bind_vs_state(info.ctx, handle);
81 }
82 
set_fragment_shader(void)83 static void set_fragment_shader(void)
84 {
85    void *handle;
86    const char *text =
87       "FRAG\n"
88       "DCL IN[0], GENERIC[0], PERSPECTIVE\n"
89       "DCL OUT[0], COLOR\n"
90       "DCL SAMP[0]\n"
91       "  0: TXP OUT[0], IN[0], SAMP[0], 2D\n"
92       "  2: END\n";
93 
94    handle = graw_parse_fragment_shader(info.ctx, text);
95    info.ctx->bind_fs_state(info.ctx, handle);
96 }
97 
98 
draw(void)99 static void draw(void)
100 {
101    union pipe_color_union clear_color;
102 
103    clear_color.f[0] = 0.5;
104    clear_color.f[1] = 0.5;
105    clear_color.f[2] = 0.5;
106    clear_color.f[3] = 1.0;
107 
108    info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
109    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, 4);
110    info.ctx->flush(info.ctx, NULL);
111 
112    graw_util_flush_front(&info);
113 }
114 
115 
116 
117 static void
init_tex(const unsigned swizzle[4])118 init_tex(const unsigned swizzle[4])
119 {
120 #define SIZE 256
121    struct pipe_sampler_view sv_template;
122    ubyte tex2d[SIZE][SIZE][4];
123    int s, t;
124 
125    for (s = 0; s < SIZE; s++) {
126       for (t = 0; t < SIZE; t++) {
127          tex2d[t][s][0] = 0;  /*B*/
128          tex2d[t][s][1] = t;  /*G*/
129          tex2d[t][s][2] = s;  /*R*/
130          tex2d[t][s][3] = 1;  /*A*/
131       }
132    }
133 
134    texture = graw_util_create_tex2d(&info, SIZE, SIZE,
135                                     PIPE_FORMAT_B8G8R8A8_UNORM, tex2d);
136 
137    memset(&sv_template, 0, sizeof sv_template);
138    sv_template.format = texture->format;
139    sv_template.texture = texture;
140    sv_template.swizzle_r = swizzle[0];
141    sv_template.swizzle_g = swizzle[1];
142    sv_template.swizzle_b = swizzle[2];
143    sv_template.swizzle_a = swizzle[3];
144    sv = info.ctx->create_sampler_view(info.ctx, texture, &sv_template);
145    if (sv == NULL)
146       exit(5);
147 
148    info.ctx->set_fragment_sampler_views(info.ctx, 1, &sv);
149 
150    sampler = graw_util_create_simple_sampler(&info,
151                                              PIPE_TEX_WRAP_REPEAT,
152                                              PIPE_TEX_FILTER_NEAREST);
153 
154    info.ctx->bind_fragment_sampler_states(info.ctx, 1, &sampler);
155 #undef SIZE
156 }
157 
158 
159 static void
init(const unsigned swizzle[4])160 init(const unsigned swizzle[4])
161 {
162    if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
163       exit(1);
164 
165    graw_util_default_state(&info, FALSE);
166 
167    graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 10000);
168 
169    init_tex(swizzle);
170 
171    set_vertices();
172    set_vertex_shader();
173    set_fragment_shader();
174 }
175 
176 
177 static unsigned
char_to_swizzle(char c)178 char_to_swizzle(char c)
179 {
180    switch (c) {
181    case 'r':
182       return PIPE_SWIZZLE_RED;
183    case 'g':
184       return PIPE_SWIZZLE_GREEN;
185    case 'b':
186       return PIPE_SWIZZLE_BLUE;
187    case 'a':
188       return PIPE_SWIZZLE_ALPHA;
189    case '0':
190       return PIPE_SWIZZLE_ZERO;
191    case '1':
192       return PIPE_SWIZZLE_ONE;
193    default:
194       return PIPE_SWIZZLE_RED;
195    }
196 }
197 
198 
main(int argc,char * argv[])199 int main(int argc, char *argv[])
200 {
201    const char swizzle_names[] = "rgba01";
202    uint swizzle[4];
203    int i;
204 
205    swizzle[0] = PIPE_SWIZZLE_RED;
206    swizzle[1] = PIPE_SWIZZLE_GREEN;
207    swizzle[2] = PIPE_SWIZZLE_BLUE;
208    swizzle[3] = PIPE_SWIZZLE_ALPHA;
209 
210    for (i = 1; i < argc; i++) {
211       swizzle[i-1] = char_to_swizzle(argv[i][0]);
212    }
213 
214    printf("Example:\n");
215    printf("  tex-swizzle r 0 g 1\n");
216    printf("Current swizzle = ");
217    for (i = 0; i < 4; i++) {
218       printf("%c", swizzle_names[swizzle[i]]);
219    }
220    printf("\n");
221 
222    init(swizzle);
223 
224    graw_set_display_func(draw);
225    graw_main_loop();
226    return 0;
227 }
228