1 /* Test the TGSI_SEMANTIC_FACE fragment shader input.
2 */
3
4 #include <stdio.h>
5
6 #include "graw_util.h"
7
8
9 static int width = 300;
10 static int height = 300;
11
12 static struct graw_info info;
13
14 struct vertex {
15 float position[4];
16 float color[4];
17 };
18
19 #define z0 0.2
20 #define z01 0.5
21 #define z1 0.4
22
23 static struct vertex vertices[] =
24 {
25 /* left quad: clock-wise, front-facing, red */
26 {
27 {-0.8, -0.9, z0, 1.0 },
28 { 0, 0, 0, 1 }
29 },
30
31 {
32 { -0.2, -0.9, z0, 1.0 },
33 { 0, 0, 0, 1 }
34 },
35
36 {
37 { 0.2, 0.9, z01, 1.0 },
38 { 0, 0, 0, 1 }
39 },
40
41 {
42 {-0.9, 0.9, z01, 1.0 },
43 { 0, 0, 0, 1 }
44 },
45
46 /* right quad : counter-clock-wise, back-facing, green */
47 {
48 { 0.2, -0.9, z1, 1.0 },
49 { 1, 1, 1, -1 }
50 },
51
52 {
53 { -0.2, 0.8, z1, 1.0 },
54 { 1, 1, 1, -1 }
55 },
56
57 {
58 { 0.9, 0.8, z1, 1.0 },
59 { 1, 1, 1, -1 }
60 },
61
62 {
63 { 0.8, -0.9, z1, 1.0 },
64 { 1, 1, 1, -1 }
65 },
66 };
67
68 #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0]))
69
70
71
72 static void
set_vertices(void)73 set_vertices(void)
74 {
75 struct pipe_vertex_element ve[2];
76 struct pipe_vertex_buffer vbuf;
77 void *handle;
78
79 memset(ve, 0, sizeof ve);
80
81 ve[0].src_offset = Offset(struct vertex, position);
82 ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
83 ve[1].src_offset = Offset(struct vertex, color);
84 ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
85
86 handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
87 info.ctx->bind_vertex_elements_state(info.ctx, handle);
88
89
90 vbuf.stride = sizeof(struct vertex);
91 vbuf.buffer_offset = 0;
92 vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
93 PIPE_BIND_VERTEX_BUFFER,
94 PIPE_USAGE_STATIC,
95 sizeof(vertices),
96 vertices);
97
98 info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
99 }
100
101
102 static void
set_vertex_shader(void)103 set_vertex_shader(void)
104 {
105 void *handle;
106 const char *text =
107 "VERT\n"
108 "DCL IN[0]\n"
109 "DCL IN[1]\n"
110 "DCL OUT[0], POSITION\n"
111 "DCL OUT[1], GENERIC[0]\n"
112 " 0: MOV OUT[0], IN[0]\n"
113 " 1: MOV OUT[1], IN[1]\n"
114 " 2: END\n";
115
116 handle = graw_parse_vertex_shader(info.ctx, text);
117 info.ctx->bind_vs_state(info.ctx, handle);
118 }
119
120
121 static void
set_fragment_shader(void)122 set_fragment_shader(void)
123 {
124 void *handle;
125 const char *text =
126 "FRAG\n"
127 "DCL IN[0], FACE, CONSTANT\n"
128 "DCL IN[1], GENERIC, CONSTANT\n"
129 "DCL OUT[0], COLOR\n"
130 "DCL TEMP[0]\n"
131 "IMM FLT32 { 1.0, 0.0, 0.0, 0.0 }\n"
132 "IMM FLT32 { 0.0, 1.0, 0.0, 0.0 }\n"
133 "IMM FLT32 { 0.5, 0.6, 0.0, 0.0 }\n"
134 " 0: SGT TEMP[0].x, IN[0].xxxx, IMM[1].xxxx\n" /* TMP[0].x = IN[0].x > 0.0 */
135 " 1: IF TEMP[0].xxxx :4\n"
136 " 2: MOV OUT[0], IMM[0]\n" /* front-facing: red */
137 " 3: ELSE :5\n"
138 " 4: MOV OUT[0], IMM[1]\n" /* back-facing: green */
139 " 5: ENDIF\n"
140 " 6: END\n";
141
142 handle = graw_parse_fragment_shader(info.ctx, text);
143 info.ctx->bind_fs_state(info.ctx, handle);
144 }
145
146
147 static void
draw(void)148 draw(void)
149 {
150 union pipe_color_union clear_color;
151
152 clear_color.f[0] = 0.25;
153 clear_color.f[1] = 0.25;
154 clear_color.f[2] = 0.25;
155 clear_color.f[3] = 1.00;
156
157 info.ctx->clear(info.ctx,
158 PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
159 &clear_color, 1.0, 0);
160 util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
161 info.ctx->flush(info.ctx, NULL);
162
163 graw_util_flush_front(&info);
164 }
165
166
167 #if 0
168 static void
169 resize(int w, int h)
170 {
171 width = w;
172 height = h;
173
174 set_viewport(0, 0, width, height, 30, 1000);
175 }
176 #endif
177
178
179 static void
init(void)180 init(void)
181 {
182 if (!graw_util_create_window(&info, width, height, 1, TRUE))
183 exit(1);
184
185 graw_util_default_state(&info, TRUE);
186
187 graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
188
189 set_vertices();
190 set_vertex_shader();
191 set_fragment_shader();
192 }
193
194
195 int
main(int argc,char * argv[])196 main(int argc, char *argv[])
197 {
198 init();
199
200 printf("Left quad: clock-wise, front-facing, red\n");
201 printf("Right quad: counter clock-wise, back-facing, green\n");
202
203 graw_set_display_func(draw);
204 /*graw_set_reshape_func(resize);*/
205 graw_main_loop();
206 return 0;
207 }
208