src/gallium/tests/graw/fs-frontface.c

   1 /* Test the TGSI_SEMANTIC_FACE fragment shader input.
   2  */
   3
   4 #include <stdio.h>
   5
   6 #include "graw_util.h"
   7
   8
   9 static int width = 300;
  10 static int height = 300;
  11
  12 static struct graw_info info;
  13
  14 struct vertex {
  15    float position[4];
  16    float color[4];
  17 };
  18
  19 #define z0 0.2
  20 #define z01 0.5
  21 #define z1 0.4
  22
  23 static struct vertex vertices[] =
  24 {
  25    /* left quad: clock-wise, front-facing, red */
  26    {
  27       {-0.8, -0.9, z0, 1.0 },
  28       { 0, 0, 0, 1 }
  29    },
  30
  31    {
  32       { -0.2, -0.9, z0, 1.0 },
  33       { 0, 0, 0, 1 }
  34    },
  35
  36    {
  37       { 0.2,  0.9, z01, 1.0 },
  38       { 0, 0, 0, 1 }
  39    },
  40
  41    {
  42       {-0.9,  0.9, z01, 1.0 },
  43       { 0, 0, 0, 1 }
  44    },
  45
  46    /* right quad : counter-clock-wise, back-facing, green */
  47    {
  48       { 0.2,  -0.9, z1, 1.0 },
  49       { 1, 1, 1, -1 }
  50    },
  51
  52    {
  53       { -0.2,  0.8, z1, 1.0 },
  54       { 1, 1, 1, -1 }
  55    },
  56
  57    {
  58       { 0.9,  0.8, z1, 1.0 },
  59       { 1, 1, 1, -1 }
  60    },
  61
  62    {
  63       { 0.8, -0.9, z1, 1.0 },
  64       { 1, 1, 1, -1 }
  65    },
  66 };
  67
  68 #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0]))
  69
  70
  71
  72 static void
  73 set_vertices(void)
  74 {
  75    struct pipe_vertex_element ve[2];
  76    struct pipe_vertex_buffer vbuf;
  77    void *handle;
  78
  79    memset(ve, 0, sizeof ve);
  80
  81    ve[0].src_offset = Offset(struct vertex, position);
  82    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  83    ve[1].src_offset = Offset(struct vertex, color);
  84    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  85
  86    handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
  87    info.ctx->bind_vertex_elements_state(info.ctx, handle);
  88
  89
  90    vbuf.stride = sizeof(struct vertex);
  91    vbuf.buffer_offset = 0;
  92    vbuf.buffer = info.screen->user_buffer_create(info.screen,
  93                                                  vertices,
  94                                                  sizeof(vertices),
  95                                                  PIPE_BIND_VERTEX_BUFFER);
  96
  97    info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
  98 }
  99
 100
 101 static void
 102 set_vertex_shader(void)
 103 {
 104    void *handle;
 105    const char *text =
 106       "VERT\n"
 107       "DCL IN[0]\n"
 108       "DCL IN[1]\n"
 109       "DCL OUT[0], POSITION\n"
 110       "DCL OUT[1], GENERIC[0]\n"
 111       "  0: MOV OUT[0], IN[0]\n"
 112       "  1: MOV OUT[1], IN[1]\n"
 113       "  2: END\n";
 114
 115    handle = graw_parse_vertex_shader(info.ctx, text);
 116    info.ctx->bind_vs_state(info.ctx, handle);
 117 }
 118
 119
 120 static void
 121 set_fragment_shader(void)
 122 {
 123    void *handle;
 124    const char *text =
 125       "FRAG\n"
 126       "DCL IN[0], FACE, CONSTANT\n"
 127       "DCL IN[1], GENERIC, CONSTANT\n"
 128       "DCL OUT[0], COLOR\n"
 129       "DCL TEMP[0]\n"
 130       "IMM FLT32 {    1.0,     0.0,     0.0,     0.0 }\n"
 131       "IMM FLT32 {    0.0,     1.0,     0.0,     0.0 }\n"
 132       "IMM FLT32 {    0.5,     0.6,     0.0,     0.0 }\n"
 133       " 0: SGT TEMP[0].x, IN[0].xxxx, IMM[1].xxxx\n"  /* TMP[0].x = IN[0].x > 0.0 */
 134       " 1: IF TEMP[0].xxxx :4\n"
 135       " 2:   MOV OUT[0], IMM[0]\n"    /* front-facing: red */
 136       " 3: ELSE :5\n"
 137       " 4:   MOV OUT[0], IMM[1]\n"    /* back-facing: green */
 138       " 5: ENDIF\n"
 139       " 6: END\n";
 140
 141    handle = graw_parse_fragment_shader(info.ctx, text);
 142    info.ctx->bind_fs_state(info.ctx, handle);
 143 }
 144
 145
 146 static void
 147 draw(void)
 148 {
 149    union pipe_color_union clear_color;
 150
 151    clear_color.f[0] = 0.25;
 152    clear_color.f[1] = 0.25;
 153    clear_color.f[2] = 0.25;
 154    clear_color.f[3] = 1.00;
 155
 156    info.ctx->clear(info.ctx,
 157               PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
 158               &clear_color, 1.0, 0);
 159    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
 160    info.ctx->flush(info.ctx, NULL);
 161
 162    graw_util_flush_front(&info);
 163 }
 164
 165
 166 #if 0
 167 static void
 168 resize(int w, int h)
 169 {
 170    width = w;
 171    height = h;
 172
 173    set_viewport(0, 0, width, height, 30, 1000);
 174 }
 175 #endif
 176
 177
 178 static void
 179 init(void)
 180 {
 181    if (!graw_util_create_window(&info, width, height, 1, TRUE))
 182       exit(1);
 183
 184    graw_util_default_state(&info, TRUE);
 185
 186    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 187
 188    set_vertices();
 189    set_vertex_shader();
 190    set_fragment_shader();
 191 }
 192
 193
 194 int
 195 main(int argc, char *argv[])
 196 {
 197    init();
 198
 199    printf("Left quad: clock-wise, front-facing, red\n");
 200    printf("Right quad: counter clock-wise, back-facing, green\n");
 201
 202    graw_set_display_func(draw);
 203    /*graw_set_reshape_func(resize);*/
 204    graw_main_loop();
 205    return 0;
 206 }