src/gallium/tests/graw/tri.c

   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
  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
  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
  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
 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
 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
 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
 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 }