1 /* Display a cleared blue window. This demo has no dependencies on
2 * any utility code, just the graw interface and gallium.
3 */
4
5 #include <stdio.h>
6 #include "graw_util.h"
7
8 static struct graw_info info;
9
10 static const int WIDTH = 300;
11 static const int HEIGHT = 300;
12
13
14 struct vertex {
15 float position[4];
16 float color[4];
17 };
18
19 static boolean FlatShade = FALSE;
20
21
22 static struct vertex vertices[3] =
23 {
24 {
25 { 0.0f, -0.9f, 0.0f, 1.0f },
26 { 1.0f, 0.0f, 0.0f, 1.0f }
27 },
28 {
29 { -0.9f, 0.9f, 0.0f, 1.0f },
30 { 0.0f, 1.0f, 0.0f, 1.0f }
31 },
32 {
33 { 0.9f, 0.9f, 0.0f, 1.0f },
34 { 0.0f, 0.0f, 1.0f, 1.0f }
35 }
36 };
37
38
set_vertices(void)39 static void set_vertices( void )
40 {
41 struct pipe_vertex_element ve[2];
42 struct pipe_vertex_buffer vbuf;
43 void *handle;
44
45 memset(ve, 0, sizeof ve);
46
47 ve[0].src_offset = Offset(struct vertex, position);
48 ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
49 ve[1].src_offset = Offset(struct vertex, color);
50 ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
51
52 handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
53 info.ctx->bind_vertex_elements_state(info.ctx, handle);
54
55 memset(&vbuf, 0, sizeof vbuf);
56
57 vbuf.stride = sizeof( struct vertex );
58 vbuf.buffer_offset = 0;
59 vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
60 PIPE_BIND_VERTEX_BUFFER,
61 PIPE_USAGE_DEFAULT,
62 sizeof(vertices),
63 vertices);
64
65 info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf);
66 }
67
68
set_vertex_shader(void)69 static void set_vertex_shader( void )
70 {
71 void *handle;
72 const char *text =
73 "VERT\n"
74 "DCL IN[0]\n"
75 "DCL IN[1]\n"
76 "DCL OUT[0], POSITION\n"
77 "DCL OUT[1], COLOR\n"
78 " 0: MOV OUT[1], IN[1]\n"
79 " 1: MOV OUT[0], IN[0]\n"
80 " 2: END\n";
81
82 handle = graw_parse_vertex_shader(info.ctx, text);
83 info.ctx->bind_vs_state(info.ctx, handle);
84 }
85
86
set_fragment_shader(void)87 static void set_fragment_shader( void )
88 {
89 void *handle;
90 const char *text =
91 "FRAG\n"
92 "DCL IN[0], COLOR, LINEAR\n"
93 "DCL OUT[0], COLOR\n"
94 " 0: MOV OUT[0], IN[0]\n"
95 " 1: END\n";
96
97 handle = graw_parse_fragment_shader(info.ctx, text);
98 info.ctx->bind_fs_state(info.ctx, handle);
99 }
100
101
draw(void)102 static void draw( void )
103 {
104 union pipe_color_union clear_color = { {1,0,1,1} };
105
106 info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
107 util_draw_arrays(info.ctx, PIPE_PRIM_TRIANGLES, 0, 3);
108 info.ctx->flush(info.ctx, NULL, 0);
109
110 graw_save_surface_to_file(info.ctx, info.color_surf[0], NULL);
111
112 graw_util_flush_front(&info);
113 }
114
115
init(void)116 static void init( void )
117 {
118 if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
119 exit(1);
120
121 graw_util_default_state(&info, FALSE);
122
123 {
124 struct pipe_rasterizer_state rasterizer;
125 void *handle;
126 memset(&rasterizer, 0, sizeof rasterizer);
127 rasterizer.cull_face = PIPE_FACE_NONE;
128 rasterizer.half_pixel_center = 1;
129 rasterizer.bottom_edge_rule = 1;
130 rasterizer.flatshade = FlatShade;
131 rasterizer.depth_clip = 1;
132 handle = info.ctx->create_rasterizer_state(info.ctx, &rasterizer);
133 info.ctx->bind_rasterizer_state(info.ctx, handle);
134 }
135
136
137 graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 1000);
138
139 set_vertices();
140 set_vertex_shader();
141 set_fragment_shader();
142 }
143
args(int argc,char * argv[])144 static void args(int argc, char *argv[])
145 {
146 int i;
147
148 for (i = 1; i < argc; ) {
149 if (graw_parse_args(&i, argc, argv)) {
150 /* ok */
151 }
152 else if (strcmp(argv[i], "-f") == 0) {
153 FlatShade = TRUE;
154 i++;
155 }
156 else {
157 printf("Invalid arg %s\n", argv[i]);
158 exit(1);
159 }
160 }
161 }
162
main(int argc,char * argv[])163 int main( int argc, char *argv[] )
164 {
165 args(argc, argv);
166 init();
167
168 graw_set_display_func( draw );
169 graw_main_loop();
170 return 0;
171 }
172