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
56 vbuf.stride = sizeof( struct vertex );
57 vbuf.buffer_offset = 0;
58 vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
59 PIPE_BIND_VERTEX_BUFFER,
60 PIPE_USAGE_STATIC,
61 sizeof(vertices),
62 vertices);
63
64 info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
65 }
66
67
set_vertex_shader(void)68 static void set_vertex_shader( void )
69 {
70 void *handle;
71 const char *text =
72 "VERT\n"
73 "DCL IN[0]\n"
74 "DCL IN[1]\n"
75 "DCL OUT[0], POSITION\n"
76 "DCL OUT[1], COLOR\n"
77 " 0: MOV OUT[1], IN[1]\n"
78 " 1: MOV OUT[0], IN[0]\n"
79 " 2: END\n";
80
81 handle = graw_parse_vertex_shader(info.ctx, text);
82 info.ctx->bind_vs_state(info.ctx, handle);
83 }
84
85
set_fragment_shader(void)86 static void set_fragment_shader( void )
87 {
88 void *handle;
89 const char *text =
90 "FRAG\n"
91 "DCL IN[0], COLOR, LINEAR\n"
92 "DCL OUT[0], COLOR\n"
93 " 0: MOV OUT[0], IN[0]\n"
94 " 1: END\n";
95
96 handle = graw_parse_fragment_shader(info.ctx, text);
97 info.ctx->bind_fs_state(info.ctx, handle);
98 }
99
100
draw(void)101 static void draw( void )
102 {
103 union pipe_color_union clear_color = { {1,0,1,1} };
104
105 info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
106 util_draw_arrays(info.ctx, PIPE_PRIM_TRIANGLES, 0, 3);
107 info.ctx->flush(info.ctx, NULL);
108
109 graw_save_surface_to_file(info.ctx, info.color_surf[0], NULL);
110
111 graw_util_flush_front(&info);
112 }
113
114
init(void)115 static void init( void )
116 {
117 if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
118 exit(1);
119
120 graw_util_default_state(&info, FALSE);
121
122 {
123 struct pipe_rasterizer_state rasterizer;
124 void *handle;
125 memset(&rasterizer, 0, sizeof rasterizer);
126 rasterizer.cull_face = PIPE_FACE_NONE;
127 rasterizer.gl_rasterization_rules = 1;
128 rasterizer.flatshade = FlatShade;
129 rasterizer.depth_clip = 1;
130 handle = info.ctx->create_rasterizer_state(info.ctx, &rasterizer);
131 info.ctx->bind_rasterizer_state(info.ctx, handle);
132 }
133
134
135 graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 1000);
136
137 set_vertices();
138 set_vertex_shader();
139 set_fragment_shader();
140 }
141
args(int argc,char * argv[])142 static void args(int argc, char *argv[])
143 {
144 int i;
145
146 for (i = 1; i < argc; ) {
147 if (graw_parse_args(&i, argc, argv)) {
148 /* ok */
149 }
150 else if (strcmp(argv[i], "-f") == 0) {
151 FlatShade = TRUE;
152 i++;
153 }
154 else {
155 printf("Invalid arg %s\n", argv[i]);
156 exit(1);
157 }
158 }
159 }
160
main(int argc,char * argv[])161 int main( int argc, char *argv[] )
162 {
163 args(argc, argv);
164 init();
165
166 graw_set_display_func( draw );
167 graw_main_loop();
168 return 0;
169 }
170