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    memset(&vbuf, 0, sizeof vbuf);
  68
  69    vbuf.stride = sizeof(struct vertex);
  70    vbuf.buffer_offset = 0;
  71    vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
  72                                               PIPE_BIND_VERTEX_BUFFER,
  73                                               PIPE_USAGE_DEFAULT,
  74                                               sizeof(vertices),
  75                                               vertices);
  76
  77    info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf);
  78 }
  79
  80
  81 static void
  82 set_vertex_shader(void)
  83 {
  84    void *handle;
  85    const char *text =
  86       "VERT\n"
  87       "DCL IN[0]\n"
  88       "DCL IN[1]\n"
  89       "DCL OUT[0], POSITION\n"
  90       "DCL OUT[1], GENERIC[0]\n"
  91       "  0: MOV OUT[0], IN[0]\n"
  92       "  1: MOV OUT[1], IN[1]\n"
  93       "  2: END\n";
  94
  95    handle = graw_parse_vertex_shader(info.ctx, text);
  96    info.ctx->bind_vs_state(info.ctx, handle);
  97 }
  98
  99
 100 static void
 101 set_fragment_shader(int mode)
 102 {
 103    void *handle;
 104
 105    const char *origin_upper_left_text =
 106       "FRAG\n"
 107       "PROPERTY FS_COORD_ORIGIN UPPER_LEFT\n"  /* upper-left = black corner */
 108       "DCL IN[0], POSITION, LINEAR\n"
 109       "DCL OUT[0], COLOR\n"
 110       "DCL TEMP[0]\n"
 111       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
 112       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
 113       " 0: MOV TEMP[0], IN[0] \n"
 114       " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 115       " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
 116       " 3: END\n";
 117
 118    const char *origin_lower_left_text =
 119       "FRAG\n"
 120       "PROPERTY FS_COORD_ORIGIN LOWER_LEFT\n"  /* lower-left = black corner */
 121       "DCL IN[0], POSITION, LINEAR\n"
 122       "DCL OUT[0], COLOR\n"
 123       "DCL TEMP[0]\n"
 124       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
 125       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
 126       " 0: MOV TEMP[0], IN[0] \n"
 127       " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 128       " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
 129       " 3: END\n";
 130
 131    /* Test fragcoord center integer vs. half integer */
 132    const char *center_integer_text =
 133       "FRAG\n"
 134       "PROPERTY FS_COORD_PIXEL_CENTER INTEGER \n"       /* pixels are black */
 135       "DCL IN[0], POSITION, LINEAR \n"
 136       "DCL OUT[0], COLOR \n"
 137       "DCL TEMP[0] \n"
 138       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
 139       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
 140       "0: FRC TEMP[0], IN[0]  \n"
 141       "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 142       "2: MOV OUT[0], TEMP[0] \n"
 143       "3: END \n";
 144
 145    const char *center_half_integer_text =
 146       "FRAG\n"
 147       "PROPERTY FS_COORD_PIXEL_CENTER HALF_INTEGER \n"  /* pixels are olive colored */
 148       "DCL IN[0], POSITION, LINEAR \n"
 149       "DCL OUT[0], COLOR \n"
 150       "DCL TEMP[0] \n"
 151       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
 152       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
 153       "0: FRC TEMP[0], IN[0]  \n"
 154       "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 155       "2: MOV OUT[0], TEMP[0] \n"
 156       "3: END \n";
 157
 158    const char *text;
 159
 160    if (mode == 0)
 161       text = origin_upper_left_text;
 162    else if (mode == 1)
 163       text = origin_lower_left_text;
 164    else if (mode == 2)
 165       text = center_integer_text;
 166    else
 167       text = center_half_integer_text;
 168
 169    handle = graw_parse_fragment_shader(info.ctx, text);
 170    info.ctx->bind_fs_state(info.ctx, handle);
 171 }
 172
 173
 174 static void
 175 draw(void)
 176 {
 177    union pipe_color_union clear_color;
 178
 179    clear_color.f[0] = 0.25;
 180    clear_color.f[1] = 0.25;
 181    clear_color.f[2] = 0.25;
 182    clear_color.f[3] = 1.0;
 183
 184    info.ctx->clear(info.ctx,
 185               PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
 186               &clear_color, 1.0, 0);
 187    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
 188    info.ctx->flush(info.ctx, NULL, 0);
 189
 190 #if 0
 191    /* At the moment, libgraw leaks out/makes available some of the
 192     * symbols from gallium/auxiliary, including these debug helpers.
 193     * Will eventually want to bless some of these paths, and lock the
 194     * others down so they aren't accessible from test programs.
 195     *
 196     * This currently just happens to work on debug builds - a release
 197     * build will probably fail to link here:
 198     */
 199    debug_dump_surface_bmp(info.ctx, "result.bmp", surf);
 200 #endif
 201
 202    graw_util_flush_front(&info);
 203 }
 204
 205
 206 #if 0
 207 static void
 208 resize(int w, int h)
 209 {
 210    width = w;
 211    height = h;
 212
 213    set_viewport(0, 0, width, height, 30, 1000);
 214 }
 215 #endif
 216
 217
 218 static void
 219 init(int mode)
 220 {
 221    if (!graw_util_create_window(&info, width, height, 1, TRUE))
 222       exit(1);
 223
 224    graw_util_default_state(&info, TRUE);
 225
 226    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 227
 228    set_vertices();
 229    set_vertex_shader();
 230    set_fragment_shader(mode);
 231 }
 232
 233
 234 int
 235 main(int argc, char *argv[])
 236 {
 237    int mode = argc > 1 ? atoi(argv[1]) : 0;
 238
 239    switch (mode) {
 240    default:
 241    case 0:
 242       printf("frag coord origin upper-left (lower-left = black)\n");
 243       break;
 244    case 1:
 245       printf("frag coord origin lower-left (upper-left = black)\n");
 246       break;
 247    case 2:
 248       printf("frag coord center integer (all pixels black)\n");
 249       break;
 250    case 3:
 251       printf("frag coord center half-integer (all pixels olive color)\n");
 252       break;
 253    }
 254
 255    init(mode);
 256
 257    graw_set_display_func(draw);
 258    /*graw_set_reshape_func(resize);*/
 259    graw_main_loop();
 260    return 0;
 261 }