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 #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 struct vertex {
  19    float position[4];
  20    float color[4];
  21 };
  22
  23 /* Note: the upper-left vertex is pushed to the left a bit to
  24  * make sure we can spot upside-down rendering.
  25  */
  26 static struct vertex vertices[] =
  27 {
  28    {
  29       {-0.95, -0.95, 0.5, 1.0 },
  30       { 0, 0, 0, 1 }
  31    },
  32
  33    {
  34       { 0.85, -0.95, 0.5, 1.0 },
  35       { 0, 0, 0, 1 }
  36    },
  37
  38    {
  39       { 0.95,  0.95, 0.5, 1.0 },
  40       { 0, 0, 0, 1 }
  41    },
  42
  43    {
  44       {-0.95,  0.95, 0.5, 1.0 },
  45       { 0, 0, 0, 1 }
  46    }
  47 };
  48
  49 #define NUM_VERTS ARRAY_SIZE(vertices)
  50
  51
  52 static void
  53 set_vertices(void)
  54 {
  55    struct pipe_vertex_element ve[2];
  56    struct pipe_vertex_buffer vbuf;
  57    void *handle;
  58
  59    memset(ve, 0, sizeof ve);
  60
  61    ve[0].src_offset = Offset(struct vertex, position);
  62    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  63    ve[1].src_offset = Offset(struct vertex, color);
  64    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  65
  66    handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
  67    info.ctx->bind_vertex_elements_state(info.ctx, handle);
  68
  69    memset(&vbuf, 0, sizeof vbuf);
  70
  71    vbuf.stride = sizeof(struct vertex);
  72    vbuf.buffer_offset = 0;
  73    vbuf.buffer.resource = pipe_buffer_create_with_data(info.ctx,
  74                                               PIPE_BIND_VERTEX_BUFFER,
  75                                               PIPE_USAGE_DEFAULT,
  76                                               sizeof(vertices),
  77                                               vertices);
  78
  79    info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf);
  80 }
  81
  82
  83 static void
  84 set_vertex_shader(void)
  85 {
  86    void *handle;
  87    const char *text =
  88       "VERT\n"
  89       "DCL IN[0]\n"
  90       "DCL IN[1]\n"
  91       "DCL OUT[0], POSITION\n"
  92       "DCL OUT[1], GENERIC[0]\n"
  93       "  0: MOV OUT[0], IN[0]\n"
  94       "  1: MOV OUT[1], IN[1]\n"
  95       "  2: END\n";
  96
  97    handle = graw_parse_vertex_shader(info.ctx, text);
  98    info.ctx->bind_vs_state(info.ctx, handle);
  99 }
 100
 101
 102 static void
 103 set_fragment_shader(int mode)
 104 {
 105    void *handle;
 106
 107    const char *origin_upper_left_text =
 108       "FRAG\n"
 109       "PROPERTY FS_COORD_ORIGIN UPPER_LEFT\n"  /* upper-left = black corner */
 110       "DCL IN[0], POSITION, LINEAR\n"
 111       "DCL OUT[0], COLOR\n"
 112       "DCL TEMP[0]\n"
 113       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
 114       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
 115       " 0: MOV TEMP[0], IN[0] \n"
 116       " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 117       " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
 118       " 3: END\n";
 119
 120    const char *origin_lower_left_text =
 121       "FRAG\n"
 122       "PROPERTY FS_COORD_ORIGIN LOWER_LEFT\n"  /* lower-left = black corner */
 123       "DCL IN[0], POSITION, LINEAR\n"
 124       "DCL OUT[0], COLOR\n"
 125       "DCL TEMP[0]\n"
 126       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
 127       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
 128       " 0: MOV TEMP[0], IN[0] \n"
 129       " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 130       " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
 131       " 3: END\n";
 132
 133    /* Test fragcoord center integer vs. half integer */
 134    const char *center_integer_text =
 135       "FRAG\n"
 136       "PROPERTY FS_COORD_PIXEL_CENTER INTEGER \n"       /* pixels are black */
 137       "DCL IN[0], POSITION, LINEAR \n"
 138       "DCL OUT[0], COLOR \n"
 139       "DCL TEMP[0] \n"
 140       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
 141       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
 142       "0: FRC TEMP[0], IN[0]  \n"
 143       "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 144       "2: MOV OUT[0], TEMP[0] \n"
 145       "3: END \n";
 146
 147    const char *center_half_integer_text =
 148       "FRAG\n"
 149       "PROPERTY FS_COORD_PIXEL_CENTER HALF_INTEGER \n"  /* pixels are olive colored */
 150       "DCL IN[0], POSITION, LINEAR \n"
 151       "DCL OUT[0], COLOR \n"
 152       "DCL TEMP[0] \n"
 153       "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
 154       "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
 155       "0: FRC TEMP[0], IN[0]  \n"
 156       "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
 157       "2: MOV OUT[0], TEMP[0] \n"
 158       "3: END \n";
 159
 160    const char *text;
 161
 162    if (mode == 0)
 163       text = origin_upper_left_text;
 164    else if (mode == 1)
 165       text = origin_lower_left_text;
 166    else if (mode == 2)
 167       text = center_integer_text;
 168    else
 169       text = center_half_integer_text;
 170
 171    handle = graw_parse_fragment_shader(info.ctx, text);
 172    info.ctx->bind_fs_state(info.ctx, handle);
 173 }
 174
 175
 176 static void
 177 draw(void)
 178 {
 179    union pipe_color_union clear_color;
 180
 181    clear_color.f[0] = 0.25;
 182    clear_color.f[1] = 0.25;
 183    clear_color.f[2] = 0.25;
 184    clear_color.f[3] = 1.0;
 185
 186    info.ctx->clear(info.ctx,
 187               PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
 188               &clear_color, 1.0, 0);
 189    util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
 190    info.ctx->flush(info.ctx, NULL, 0);
 191
 192 #if 0
 193    /* At the moment, libgraw leaks out/makes available some of the
 194     * symbols from gallium/auxiliary, including these debug helpers.
 195     * Will eventually want to bless some of these paths, and lock the
 196     * others down so they aren't accessible from test programs.
 197     *
 198     * This currently just happens to work on debug builds - a release
 199     * build will probably fail to link here:
 200     */
 201    debug_dump_surface_bmp(info.ctx, "result.bmp", surf);
 202 #endif
 203
 204    graw_util_flush_front(&info);
 205 }
 206
 207
 208 #if 0
 209 static void
 210 resize(int w, int h)
 211 {
 212    width = w;
 213    height = h;
 214
 215    set_viewport(0, 0, width, height, 30, 1000);
 216 }
 217 #endif
 218
 219
 220 static void
 221 init(int mode)
 222 {
 223    if (!graw_util_create_window(&info, width, height, 1, TRUE))
 224       exit(1);
 225
 226    graw_util_default_state(&info, TRUE);
 227
 228    graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
 229
 230    set_vertices();
 231    set_vertex_shader();
 232    set_fragment_shader(mode);
 233 }
 234
 235
 236 int
 237 main(int argc, char *argv[])
 238 {
 239    int mode = argc > 1 ? atoi(argv[1]) : 0;
 240
 241    switch (mode) {
 242    default:
 243    case 0:
 244       printf("frag coord origin upper-left (lower-left = black)\n");
 245       break;
 246    case 1:
 247       printf("frag coord origin lower-left (upper-left = black)\n");
 248       break;
 249    case 2:
 250       printf("frag coord center integer (all pixels black)\n");
 251       break;
 252    case 3:
 253       printf("frag coord center half-integer (all pixels olive color)\n");
 254       break;
 255    }
 256
 257    init(mode);
 258
 259    graw_set_display_func(draw);
 260    /*graw_set_reshape_func(resize);*/
 261    graw_main_loop();
 262    return 0;
 263 }