1/* Display a huge triangle on a 8192x8192 canvas.
2 * This demo has no dependencies on any utility code,
3 * just the graw interface and gallium.
4 */
5
6#include "graw_util.h"
7#include "util/u_debug.h"
8
9#include <stdio.h>
10
11static struct graw_info info;
12
13static const int WIDTH = 4*2048;
14static const int HEIGHT = 4*2048;
15
16
17struct vertex {
18   float position[4];
19   float color[4];
20};
21
22static boolean FlatShade = FALSE;
23
24
25static struct vertex vertices[3] =
26{
27   {
28      { -1.0f, -1.0f, 0.0f, 1.0f },
29      { 1.0f, 0.0f, 0.0f, 1.0f }
30   },
31   {
32      { -1.0f, 1.0f, 0.0f, 1.0f },
33      { 0.0f, 1.0f, 0.0f, 1.0f }
34   },
35   {
36      { 1.0f, 1.0f, 0.0f, 1.0f },
37      { 0.0f, 0.0f, 1.0f, 1.0f }
38   }
39};
40
41
42static void set_vertices( void )
43{
44   struct pipe_vertex_element ve[2];
45   struct pipe_vertex_buffer vbuf;
46   void *handle;
47
48   memset(ve, 0, sizeof ve);
49
50   ve[0].src_offset = Offset(struct vertex, position);
51   ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
52   ve[1].src_offset = Offset(struct vertex, color);
53   ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
54
55   handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
56   info.ctx->bind_vertex_elements_state(info.ctx, handle);
57
58   memset(&vbuf, 0, sizeof vbuf);
59
60   vbuf.stride = sizeof( struct vertex );
61   vbuf.buffer_offset = 0;
62   vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
63                                              PIPE_BIND_VERTEX_BUFFER,
64                                              PIPE_USAGE_DEFAULT,
65                                              sizeof(vertices),
66                                              vertices);
67
68   info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf);
69}
70
71
72static void set_vertex_shader( void )
73{
74   void *handle;
75   const char *text =
76      "VERT\n"
77      "DCL IN[0]\n"
78      "DCL IN[1]\n"
79      "DCL OUT[0], POSITION\n"
80      "DCL OUT[1], COLOR\n"
81      "  0: MOV OUT[1], IN[1]\n"
82      "  1: MOV OUT[0], IN[0]\n"
83      "  2: END\n";
84
85   handle = graw_parse_vertex_shader(info.ctx, text);
86   info.ctx->bind_vs_state(info.ctx, handle);
87}
88
89
90static void set_fragment_shader( void )
91{
92   void *handle;
93   const char *text =
94      "FRAG\n"
95      "DCL IN[0], COLOR, LINEAR\n"
96      "DCL OUT[0], COLOR\n"
97      "  0: MOV OUT[0], IN[0]\n"
98      "  1: END\n";
99
100   handle = graw_parse_fragment_shader(info.ctx, text);
101   info.ctx->bind_fs_state(info.ctx, handle);
102}
103
104
105static void draw( void )
106{
107   union pipe_color_union clear_color = { {1,0,1,1} };
108
109   info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
110   util_draw_arrays(info.ctx, PIPE_PRIM_TRIANGLES, 0, 3);
111   info.ctx->flush(info.ctx, NULL, 0);
112
113   graw_save_surface_to_file(info.ctx, info.color_surf[0], NULL);
114
115   graw_util_flush_front(&info);
116}
117
118
119static void init( void )
120{
121   if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
122      exit(1);
123
124   graw_util_default_state(&info, FALSE);
125
126   {
127      struct pipe_rasterizer_state rasterizer;
128      void *handle;
129      memset(&rasterizer, 0, sizeof rasterizer);
130      rasterizer.cull_face = PIPE_FACE_NONE;
131      rasterizer.half_pixel_center = 1;
132      rasterizer.bottom_edge_rule = 1;
133      rasterizer.flatshade = FlatShade;
134      rasterizer.depth_clip = 1;
135      handle = info.ctx->create_rasterizer_state(info.ctx, &rasterizer);
136      info.ctx->bind_rasterizer_state(info.ctx, handle);
137   }
138
139
140   graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 1000);
141
142   set_vertices();
143   set_vertex_shader();
144   set_fragment_shader();
145}
146
147static void args(int argc, char *argv[])
148{
149   int i;
150
151   for (i = 1; i < argc; ) {
152      if (graw_parse_args(&i, argc, argv)) {
153         /* ok */
154      }
155      else if (strcmp(argv[i], "-f") == 0) {
156         FlatShade = TRUE;
157         i++;
158      }
159      else {
160         printf("Invalid arg %s\n", argv[i]);
161         exit(1);
162      }
163   }
164}
165
166int main( int argc, char *argv[] )
167{
168   args(argc, argv);
169   init();
170
171   graw_set_display_func( draw );
172   graw_main_loop();
173   return 0;
174}
175