src/gallium/tests/graw/fs-write-z.c

   1 /* Test the writing Z in fragment shader.
   2  * The red quad should be entirely in front of the blue quad even
   3  * though the overlap and intersect in Z.
   4  */
   5
   6 #include <stdio.h>
   7
   8 #include "graw_util.h"
   9
  10
  11 static int width = 300;
  12 static int height = 300;
  13
  14 static struct graw_info info;
  15
  16
  17 struct vertex {
  18    float position[4];
  19    float color[4];
  20 };
  21
  22 #define z0 0.2
  23 #define z01 0.5
  24 #define z1 0.4
  25
  26
  27 static struct vertex vertices[] =
  28 {
  29    /* left quad: clock-wise, front-facing, red */
  30    {
  31       {-0.8, -0.9, z0, 1.0 },
  32       { 1, 0, 0, 1 }
  33    },
  34
  35    {
  36       { -0.2, -0.9, z0, 1.0 },
  37       { 1, 0, 0, 1 }
  38    },
  39
  40    {
  41       { 0.2,  0.9, z01, 1.0 },
  42       { 1, 0, 0, 1 }
  43    },
  44
  45    {
  46       {-0.9,  0.9, z01, 1.0 },
  47       { 1, 0, 0, 1 }
  48    },
  49
  50    /* right quad : counter-clock-wise, back-facing, green */
  51    {
  52       { 0.2,  -0.9, z1, 1.0 },
  53       { 0, 0, 1, -1 }
  54    },
  55
  56    {
  57       { -0.2,  0.8, z1, 1.0 },
  58       { 0, 0, 1, -1 }
  59    },
  60
  61    {
  62       { 0.9,  0.8, z1, 1.0 },
  63       { 0, 0, 1, -1 }
  64    },
  65
  66    {
  67       { 0.8, -0.9, z1, 1.0 },
  68       { 0, 0, 1, -1 }
  69    },
  70 };
  71
  72 #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0]))
  73
  74
  75
  76 static void
  77 set_vertices(void)
  78 {
  79    struct pipe_vertex_element ve[2];
  80    struct pipe_vertex_buffer vbuf;
  81    void *handle;
  82
  83    memset(ve, 0, sizeof ve);
  84
  85    ve[0].src_offset = Offset(struct vertex, position);
  86    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  87    ve[1].src_offset = Offset(struct vertex, color);
  88    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  89
  90    handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
  91    info.ctx->bind_vertex_elements_state(info.ctx, handle);
  92
  93
  94    vbuf.stride = sizeof(struct vertex);
  95    vbuf.buffer_offset = 0;
  96    vbuf.buffer = info.screen->user_buffer_create(info.screen,
  97                                                  vertices,
  98                                                  sizeof(vertices),
  99                                                  PIPE_BIND_VERTEX_BUFFER);
 100
 101    info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
 102 }
 103
 104
 105 static void
 106 set_vertex_shader(void)
 107 {
 108    void *handle;
 109    const char *text =
 110       "VERT\n"
 111       "DCL IN[0]\n"
 112       "DCL IN[1]\n"
 113       "DCL OUT[0], POSITION\n"
 114       "DCL OUT[1], GENERIC[0]\n"
 115       "  0: MOV OUT[0], IN[0]\n"
 116       "  1: MOV OUT[1], IN[1]\n"
 117       "  2: END\n";
 118
 119    handle = graw_parse_vertex_shader(info.ctx, text);
 120    info.ctx->bind_vs_state(info.ctx, handle);
 121 }
 122
 123
 124 static void
 125 set_fragment_shader(void)
 126 {
 127    void *handle;
 128    const char *text =
 129       "FRAG\n"
 130       "DCL IN[0], GENERIC, CONSTANT\n"
 131       "DCL OUT[0], COLOR\n"
 132       "DCL OUT[1], POSITION\n"
 133       "DCL TEMP[0]\n"
 134       "IMM FLT32 {    1.0,     0.0,     0.0,     0.0 }\n"
 135       "IMM FLT32 {    0.0,     1.0,     0.0,     0.0 }\n"
 136       "IMM FLT32 {    0.5,     0.4,     0.0,     0.0 }\n"
 137       " 0: MOV OUT[0], IN[0]\n"    /* front-facing: red */
 138       " 1: IF IN[0].xxxx :3\n"
 139       " 2:   MOV OUT[1].z, IMM[2].yyyy\n"   /* red: Z = 0.4 */
 140       " 3: ELSE :5\n"
 141       " 4:   MOV OUT[1].z, IMM[2].xxxx\n"   /* blue: Z = 0.5 */
 142       " 5: ENDIF\n"
 143       " 6: END\n";
 144
 145    handle = graw_parse_fragment_shader(info.ctx, text);
 146    info.ctx->bind_fs_state(info.ctx, handle);
 147 }
 148
 149
 150
 151 static void
 152 draw(void)
 153 {
 154    union pipe_color_union clear_color;
 155
 156    clear_color.f[0] = 0.25;
 157    clear_color.f[1] = 0.25;
 158    clear_color.f[2] = 0.25;
 159    clear_color.f[3] = 1.00;
 160
 161    info.ctx->clear(info.ctx,
 162               PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
 163               &clear_color, 1.0, 0);
 164    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
 165    info.ctx->flush(info.ctx, NULL);
 166
 167 #if 0
 168    /* At the moment, libgraw leaks out/makes available some of the
 169     * symbols from gallium/auxiliary, including these debug helpers.
 170     * Will eventually want to bless some of these paths, and lock the
 171     * others down so they aren't accessible from test programs.
 172     *
 173     * This currently just happens to work on debug builds - a release
 174     * build will probably fail to link here:
 175     */
 176    debug_dump_surface_bmp(info.ctx, "result.bmp", surf);
 177 #endif
 178
 179    graw_util_flush_front(&info);
 180 }
 181
 182
 183 #if 0
 184 static void
 185 resize(int w, int h)
 186 {
 187    width = w;
 188    height = h;
 189
 190    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 191 }
 192 #endif
 193
 194
 195 static void
 196 init(void)
 197 {
 198    if (!graw_util_create_window(&info, width, height, 1, TRUE))
 199       exit(1);
 200
 201    graw_util_default_state(&info, TRUE);
 202
 203    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 204
 205    set_vertices();
 206    set_vertex_shader();
 207    set_fragment_shader();
 208 }
 209
 210
 211 int
 212 main(int argc, char *argv[])
 213 {
 214    init();
 215
 216    printf("The red quad should be entirely in front of the blue quad.\n");
 217
 218    graw_set_display_func(draw);
 219    /*graw_set_reshape_func(resize);*/
 220    graw_main_loop();
 221    return 0;
 222 }