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 #include "util/macros.h"
  11
  12
  13 static int width = 300;
  14 static int height = 300;
  15
  16 static struct graw_info info;
  17
  18
  19 struct vertex {
  20    float position[4];
  21    float color[4];
  22 };
  23
  24 #define z0 0.2
  25 #define z01 0.5
  26 #define z1 0.4
  27
  28
  29 static struct vertex vertices[] =
  30 {
  31    /* left quad: clock-wise, front-facing, red */
  32    {
  33       {-0.8, -0.9, z0, 1.0 },
  34       { 1, 0, 0, 1 }
  35    },
  36
  37    {
  38       { -0.2, -0.9, z0, 1.0 },
  39       { 1, 0, 0, 1 }
  40    },
  41
  42    {
  43       { 0.2,  0.9, z01, 1.0 },
  44       { 1, 0, 0, 1 }
  45    },
  46
  47    {
  48       {-0.9,  0.9, z01, 1.0 },
  49       { 1, 0, 0, 1 }
  50    },
  51
  52    /* right quad : counter-clock-wise, back-facing, green */
  53    {
  54       { 0.2,  -0.9, z1, 1.0 },
  55       { 0, 0, 1, -1 }
  56    },
  57
  58    {
  59       { -0.2,  0.8, z1, 1.0 },
  60       { 0, 0, 1, -1 }
  61    },
  62
  63    {
  64       { 0.9,  0.8, z1, 1.0 },
  65       { 0, 0, 1, -1 }
  66    },
  67
  68    {
  69       { 0.8, -0.9, z1, 1.0 },
  70       { 0, 0, 1, -1 }
  71    },
  72 };
  73
  74 #define NUM_VERTS ARRAY_SIZE(vertices)
  75
  76
  77
  78 static void
  79 set_vertices(void)
  80 {
  81    struct pipe_vertex_element ve[2];
  82    struct pipe_vertex_buffer vbuf;
  83    void *handle;
  84
  85    memset(ve, 0, sizeof ve);
  86
  87    ve[0].src_offset = Offset(struct vertex, position);
  88    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  89    ve[1].src_offset = Offset(struct vertex, color);
  90    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  91
  92    handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
  93    info.ctx->bind_vertex_elements_state(info.ctx, handle);
  94
  95    memset(&vbuf, 0, sizeof vbuf);
  96
  97    vbuf.stride = sizeof(struct vertex);
  98    vbuf.buffer_offset = 0;
  99    vbuf.buffer.resource = pipe_buffer_create_with_data(info.ctx,
 100                                               PIPE_BIND_VERTEX_BUFFER,
 101                                               PIPE_USAGE_DEFAULT,
 102                                               sizeof(vertices),
 103                                               vertices);
 104
 105    info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf);
 106 }
 107
 108
 109 static void
 110 set_vertex_shader(void)
 111 {
 112    void *handle;
 113    const char *text =
 114       "VERT\n"
 115       "DCL IN[0]\n"
 116       "DCL IN[1]\n"
 117       "DCL OUT[0], POSITION\n"
 118       "DCL OUT[1], GENERIC[0]\n"
 119       "  0: MOV OUT[0], IN[0]\n"
 120       "  1: MOV OUT[1], IN[1]\n"
 121       "  2: END\n";
 122
 123    handle = graw_parse_vertex_shader(info.ctx, text);
 124    info.ctx->bind_vs_state(info.ctx, handle);
 125 }
 126
 127
 128 static void
 129 set_fragment_shader(void)
 130 {
 131    void *handle;
 132    const char *text =
 133       "FRAG\n"
 134       "DCL IN[0], GENERIC, CONSTANT\n"
 135       "DCL OUT[0], COLOR\n"
 136       "DCL OUT[1], POSITION\n"
 137       "DCL TEMP[0]\n"
 138       "IMM FLT32 {    1.0,     0.0,     0.0,     0.0 }\n"
 139       "IMM FLT32 {    0.0,     1.0,     0.0,     0.0 }\n"
 140       "IMM FLT32 {    0.5,     0.4,     0.0,     0.0 }\n"
 141       " 0: MOV OUT[0], IN[0]\n"    /* front-facing: red */
 142       " 1: IF IN[0].xxxx :3\n"
 143       " 2:   MOV OUT[1].z, IMM[2].yyyy\n"   /* red: Z = 0.4 */
 144       " 3: ELSE :5\n"
 145       " 4:   MOV OUT[1].z, IMM[2].xxxx\n"   /* blue: Z = 0.5 */
 146       " 5: ENDIF\n"
 147       " 6: END\n";
 148
 149    handle = graw_parse_fragment_shader(info.ctx, text);
 150    info.ctx->bind_fs_state(info.ctx, handle);
 151 }
 152
 153
 154
 155 static void
 156 draw(void)
 157 {
 158    union pipe_color_union clear_color;
 159
 160    clear_color.f[0] = 0.25;
 161    clear_color.f[1] = 0.25;
 162    clear_color.f[2] = 0.25;
 163    clear_color.f[3] = 1.00;
 164
 165    info.ctx->clear(info.ctx,
 166               PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
 167               &clear_color, 1.0, 0);
 168    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
 169    info.ctx->flush(info.ctx, NULL, 0);
 170
 171 #if 0
 172    /* At the moment, libgraw leaks out/makes available some of the
 173     * symbols from gallium/auxiliary, including these debug helpers.
 174     * Will eventually want to bless some of these paths, and lock the
 175     * others down so they aren't accessible from test programs.
 176     *
 177     * This currently just happens to work on debug builds - a release
 178     * build will probably fail to link here:
 179     */
 180    debug_dump_surface_bmp(info.ctx, "result.bmp", surf);
 181 #endif
 182
 183    graw_util_flush_front(&info);
 184 }
 185
 186
 187 #if 0
 188 static void
 189 resize(int w, int h)
 190 {
 191    width = w;
 192    height = h;
 193
 194    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 195 }
 196 #endif
 197
 198
 199 static void
 200 init(void)
 201 {
 202    if (!graw_util_create_window(&info, width, height, 1, TRUE))
 203       exit(1);
 204
 205    graw_util_default_state(&info, TRUE);
 206
 207    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 208
 209    set_vertices();
 210    set_vertex_shader();
 211    set_fragment_shader();
 212 }
 213
 214
 215 int
 216 main(int argc, char *argv[])
 217 {
 218    init();
 219
 220    printf("The red quad should be entirely in front of the blue quad.\n");
 221
 222    graw_set_display_func(draw);
 223    /*graw_set_reshape_func(resize);*/
 224    graw_main_loop();
 225    return 0;
 226 }