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
8static struct graw_info info;
9
10static const int WIDTH = 300;
11static const int HEIGHT = 300;
12
13
14struct vertex {
15   float position[4];
16   float color[4];
17};
18
19static boolean FlatShade = FALSE;
20
21
22static 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
39static 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
68static 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
86static 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
101static 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
115static 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
142static 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
161int 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