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

   1 /* Test the TGSI_SEMANTIC_POSITION fragment shader input.
   2  * Plus properties for upper-left vs. lower-left origin and
   3  * center integer vs. half-integer;
   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 struct vertex {
  17    float position[4];
  18    float color[4];
  19 };
  20
  21 /* Note: the upper-left vertex is pushed to the left a bit to
  22  * make sure we can spot upside-down rendering.
  23  */
  24 static struct vertex vertices[] =
  25 {
  26    {
  27       {-0.95, -0.95, 0.5, 1.0 },
  28       { 0, 0, 0, 1 }
  29    },
  30
  31    {
  32       { 0.85, -0.95, 0.5, 1.0 },
  33       { 0, 0, 0, 1 }
  34    },
  35
  36    {
  37       { 0.95,  0.95, 0.5, 1.0 },
  38       { 0, 0, 0, 1 }
  39    },
  40
  41    {
  42       {-0.95,  0.95, 0.5, 1.0 },
  43       { 0, 0, 0, 1 }
  44    }
  45 };
  46
  47 #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0]))
  48
  49
  50 static void
  51 set_vertices(void)
  52 {
  53    struct pipe_vertex_element ve[2];
  54    struct pipe_vertex_buffer vbuf;
  55    void *handle;
  56
  57    memset(ve, 0, sizeof ve);
  58
  59    ve[0].src_offset = Offset(struct vertex, position);
  60    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  61    ve[1].src_offset = Offset(struct vertex, color);
  62    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  63
  64    handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
  65    info.ctx->bind_vertex_elements_state(info.ctx, handle);
  66
  67
  68    vbuf.stride = sizeof(struct vertex);
  69    vbuf.buffer_offset = 0;
  70    vbuf.buffer = info.screen->user_buffer_create(info.screen,
  71                                             vertices,
  72                                             sizeof(vertices),
  73                                             PIPE_BIND_VERTEX_BUFFER);
  74
  75    info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
  76 }
  77
  78
  79 static void
  80 set_vertex_shader(void)
  81 {
  82    void *handle;
  83    const char *text =
  84       "VERT\n"
  85       "DCL IN[0]\n"
  86       "DCL IN[1]\n"
  87       "DCL OUT[0], POSITION\n"
  88       "DCL OUT[1], GENERIC[0]\n"
  89       "  0: MOV OUT[0], IN[0]\n"
  90       "  1: MOV OUT[1], IN[1]\n"
  91       "  2: END\n";
  92
  93    handle = graw_parse_vertex_shader(info.ctx, text);
  94    info.ctx->bind_vs_state(info.ctx, handle);
  95 }
  96
  97
  98 static void
  99 set_fragment_shader(int mode)
 100 {
 101    void *handle;
 102
 103    const char *origin_upper_left_text =
 104       "FRAG\n"
 105       "PROPERTY FS_COORD_ORIGIN UPPER_LEFT\n"  /* upper-left = black corner */
 106       "DCL IN[0], POSITION, LINEAR\n"
 107       "DCL OUT[0], COLOR\n"
 108       "DCL TEMP[0]\n"
 109       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
 110       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
 111       " 0: MOV TEMP[0], IN[0] \n"
 112       " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 113       " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
 114       " 3: END\n";
 115
 116    const char *origin_lower_left_text =
 117       "FRAG\n"
 118       "PROPERTY FS_COORD_ORIGIN LOWER_LEFT\n"  /* lower-left = black corner */
 119       "DCL IN[0], POSITION, LINEAR\n"
 120       "DCL OUT[0], COLOR\n"
 121       "DCL TEMP[0]\n"
 122       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
 123       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
 124       " 0: MOV TEMP[0], IN[0] \n"
 125       " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 126       " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
 127       " 3: END\n";
 128
 129    /* Test fragcoord center integer vs. half integer */
 130    const char *center_integer_text =
 131       "FRAG\n"
 132       "PROPERTY FS_COORD_PIXEL_CENTER INTEGER \n"       /* pixels are black */
 133       "DCL IN[0], POSITION, LINEAR \n"
 134       "DCL OUT[0], COLOR \n"
 135       "DCL TEMP[0] \n"
 136       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
 137       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
 138       "0: FRC TEMP[0], IN[0]  \n"
 139       "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 140       "2: MOV OUT[0], TEMP[0] \n"
 141       "3: END \n";
 142
 143    const char *center_half_integer_text =
 144       "FRAG\n"
 145       "PROPERTY FS_COORD_PIXEL_CENTER HALF_INTEGER \n"  /* pixels are olive colored */
 146       "DCL IN[0], POSITION, LINEAR \n"
 147       "DCL OUT[0], COLOR \n"
 148       "DCL TEMP[0] \n"
 149       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
 150       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
 151       "0: FRC TEMP[0], IN[0]  \n"
 152       "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 153       "2: MOV OUT[0], TEMP[0] \n"
 154       "3: END \n";
 155
 156    const char *text;
 157
 158    if (mode == 0)
 159       text = origin_upper_left_text;
 160    else if (mode == 1)
 161       text = origin_lower_left_text;
 162    else if (mode == 2)
 163       text = center_integer_text;
 164    else
 165       text = center_half_integer_text;
 166
 167    handle = graw_parse_fragment_shader(info.ctx, text);
 168    info.ctx->bind_fs_state(info.ctx, handle);
 169 }
 170
 171
 172 static void
 173 draw(void)
 174 {
 175    union pipe_color_union clear_color;
 176
 177    clear_color.f[0] = 0.25;
 178    clear_color.f[1] = 0.25;
 179    clear_color.f[2] = 0.25;
 180    clear_color.f[3] = 1.0;
 181
 182    info.ctx->clear(info.ctx,
 183               PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
 184               &clear_color, 1.0, 0);
 185    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
 186    info.ctx->flush(info.ctx, NULL);
 187
 188 #if 0
 189    /* At the moment, libgraw leaks out/makes available some of the
 190     * symbols from gallium/auxiliary, including these debug helpers.
 191     * Will eventually want to bless some of these paths, and lock the
 192     * others down so they aren't accessible from test programs.
 193     *
 194     * This currently just happens to work on debug builds - a release
 195     * build will probably fail to link here:
 196     */
 197    debug_dump_surface_bmp(info.ctx, "result.bmp", surf);
 198 #endif
 199
 200    graw_util_flush_front(&info);
 201 }
 202
 203
 204 #if 0
 205 static void
 206 resize(int w, int h)
 207 {
 208    width = w;
 209    height = h;
 210
 211    set_viewport(0, 0, width, height, 30, 1000);
 212 }
 213 #endif
 214
 215
 216 static void
 217 init(int mode)
 218 {
 219    if (!graw_util_create_window(&info, width, height, 1, TRUE))
 220       exit(1);
 221
 222    graw_util_default_state(&info, TRUE);
 223
 224    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 225
 226    set_vertices();
 227    set_vertex_shader();
 228    set_fragment_shader(mode);
 229 }
 230
 231
 232 int
 233 main(int argc, char *argv[])
 234 {
 235    int mode = argc > 1 ? atoi(argv[1]) : 0;
 236
 237    switch (mode) {
 238    default:
 239    case 0:
 240       printf("frag coord origin upper-left (lower-left = black)\n");
 241       break;
 242    case 1:
 243       printf("frag coord origin lower-left (upper-left = black)\n");
 244       break;
 245    case 2:
 246       printf("frag coord center integer (all pixels black)\n");
 247       break;
 248    case 3:
 249       printf("frag coord center half-integer (all pixels olive color)\n");
 250       break;
 251    }
 252
 253    init(mode);
 254
 255    graw_set_display_func(draw);
 256    /*graw_set_reshape_func(resize);*/
 257    graw_main_loop();
 258    return 0;
 259 }