src/gallium/tests/graw/tri-instanced.c

   1 /*
   2  * Test draw instancing.
   3  */
   4
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 #include "state_tracker/graw.h"
   9 #include "pipe/p_screen.h"
  10 #include "pipe/p_context.h"
  11 #include "pipe/p_state.h"
  12 #include "pipe/p_defines.h"
  13
  14 #include "util/u_memory.h"      /* Offset() */
  15 #include "util/u_draw_quad.h"
  16
  17
  18 enum pipe_format formats[] = {
  19    PIPE_FORMAT_R8G8B8A8_UNORM,
  20    PIPE_FORMAT_B8G8R8A8_UNORM,
  21    PIPE_FORMAT_NONE
  22 };
  23
  24 static const int WIDTH = 300;
  25 static const int HEIGHT = 300;
  26
  27 static struct pipe_screen *screen = NULL;
  28 static struct pipe_context *ctx = NULL;
  29 static struct pipe_surface *surf = NULL;
  30 static struct pipe_resource *tex = NULL;
  31 static void *window = NULL;
  32
  33 struct vertex {
  34    float position[4];
  35    float color[4];
  36 };
  37
  38
  39 static int draw_elements = 0;
  40
  41
  42 /**
  43  * Vertex data.
  44  * Each vertex has three attributes: position, color and translation.
  45  * The translation attribute is a per-instance attribute.  See
  46  * "instance_divisor" below.
  47  */
  48 static struct vertex vertices[4] =
  49 {
  50    {
  51       { 0.0f, -0.3f, 0.0f, 1.0f },  /* pos */
  52       { 1.0f, 0.0f, 0.0f, 1.0f }    /* color */
  53    },
  54    {
  55       { -0.2f, 0.3f, 0.0f, 1.0f },
  56       { 0.0f, 1.0f, 0.0f, 1.0f }
  57    },
  58    {
  59       { 0.2f, 0.3f, 0.0f, 1.0f },
  60       { 0.0f, 0.0f, 1.0f, 1.0f }
  61    }
  62 };
  63
  64
  65 #define NUM_INST 5
  66
  67 static float inst_data[NUM_INST][4] =
  68 {
  69    { -0.50f, 0.4f, 0.0f, 0.0f },
  70    { -0.25f, 0.1f, 0.0f, 0.0f },
  71    { 0.00f, 0.2f, 0.0f, 0.0f },
  72    { 0.25f, 0.1f, 0.0f, 0.0f },
  73    { 0.50f, 0.3f, 0.0f, 0.0f }
  74 };
  75
  76
  77 static ushort indices[3] = { 0, 2, 1 };
  78
  79
  80 static void set_viewport( float x, float y,
  81                           float width, float height,
  82                           float near, float far)
  83 {
  84    float z = far;
  85    float half_width = (float)width / 2.0f;
  86    float half_height = (float)height / 2.0f;
  87    float half_depth = ((float)far - (float)near) / 2.0f;
  88    struct pipe_viewport_state vp;
  89
  90    vp.scale[0] = half_width;
  91    vp.scale[1] = half_height;
  92    vp.scale[2] = half_depth;
  93    vp.scale[3] = 1.0f;
  94
  95    vp.translate[0] = half_width + x;
  96    vp.translate[1] = half_height + y;
  97    vp.translate[2] = half_depth + z;
  98    vp.translate[3] = 0.0f;
  99
 100    ctx->set_viewport_state( ctx, &vp );
 101 }
 102
 103
 104 static void set_vertices( void )
 105 {
 106    struct pipe_vertex_element ve[3];
 107    struct pipe_vertex_buffer vbuf[2];
 108    struct pipe_index_buffer ibuf;
 109    void *handle;
 110
 111    memset(ve, 0, sizeof ve);
 112
 113    /* pos */
 114    ve[0].src_offset = Offset(struct vertex, position);
 115    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 116    ve[0].vertex_buffer_index = 0;
 117
 118    /* color */
 119    ve[1].src_offset = Offset(struct vertex, color);
 120    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 121    ve[1].vertex_buffer_index = 0;
 122
 123    /* per-instance info */
 124    ve[2].src_offset = 0;
 125    ve[2].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 126    ve[2].vertex_buffer_index = 1;
 127    ve[2].instance_divisor = 1;
 128
 129    handle = ctx->create_vertex_elements_state(ctx, 3, ve);
 130    ctx->bind_vertex_elements_state(ctx, handle);
 131
 132
 133    /* vertex data */
 134    vbuf[0].stride = sizeof( struct vertex );
 135    vbuf[0].max_index = sizeof(vertices) / vbuf[0].stride;
 136    vbuf[0].buffer_offset = 0;
 137    vbuf[0].buffer = screen->user_buffer_create(screen,
 138                                                vertices,
 139                                                sizeof(vertices),
 140                                                PIPE_BIND_VERTEX_BUFFER);
 141
 142    /* instance data */
 143    vbuf[1].stride = sizeof( inst_data[0] );
 144    vbuf[1].max_index = sizeof(inst_data) / vbuf[1].stride;
 145    vbuf[1].buffer_offset = 0;
 146    vbuf[1].buffer = screen->user_buffer_create(screen,
 147                                                inst_data,
 148                                                sizeof(inst_data),
 149                                                PIPE_BIND_VERTEX_BUFFER);
 150
 151
 152    ctx->set_vertex_buffers(ctx, 2, vbuf);
 153
 154    /* index data */
 155    ibuf.buffer = screen->user_buffer_create(screen,
 156                                             indices,
 157                                             sizeof(indices),
 158                                             PIPE_BIND_VERTEX_BUFFER);
 159    ibuf.offset = 0;
 160    ibuf.index_size = 2;
 161
 162    ctx->set_index_buffer(ctx, &ibuf);
 163
 164 }
 165
 166 static void set_vertex_shader( void )
 167 {
 168    void *handle;
 169    const char *text =
 170       "VERT\n"
 171       "DCL IN[0]\n"
 172       "DCL IN[1]\n"
 173       "DCL IN[2]\n"
 174       "DCL OUT[0], POSITION\n"
 175       "DCL OUT[1], COLOR\n"
 176       "  0: MOV OUT[1], IN[1]\n"
 177       "  1: ADD OUT[0], IN[0], IN[2]\n"  /* add instance pos to vertex pos */
 178       "  2: END\n";
 179
 180    handle = graw_parse_vertex_shader(ctx, text);
 181    ctx->bind_vs_state(ctx, handle);
 182 }
 183
 184 static void set_fragment_shader( void )
 185 {
 186    void *handle;
 187    const char *text =
 188       "FRAG\n"
 189       "DCL IN[0], COLOR, LINEAR\n"
 190       "DCL OUT[0], COLOR\n"
 191       "  0: MOV OUT[0], IN[0]\n"
 192       "  1: END\n";
 193
 194    handle = graw_parse_fragment_shader(ctx, text);
 195    ctx->bind_fs_state(ctx, handle);
 196 }
 197
 198
 199 static void draw( void )
 200 {
 201    float clear_color[4] = {1,0,1,1};
 202    struct pipe_draw_info info;
 203
 204    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 205
 206    util_draw_init_info(&info);
 207    info.indexed = (draw_elements != 0);
 208    info.mode = PIPE_PRIM_TRIANGLES;
 209    info.start = 0;
 210    info.count = 3;
 211    /* draw NUM_INST triangles */
 212    info.instance_count = NUM_INST;
 213
 214    ctx->draw_vbo(ctx, &info);
 215
 216    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 217
 218    graw_save_surface_to_file(ctx, surf, NULL);
 219
 220    screen->flush_frontbuffer(screen, tex, 0, 0, window);
 221 }
 222
 223
 224 static void init( void )
 225 {
 226    struct pipe_framebuffer_state fb;
 227    struct pipe_resource templat;
 228    struct pipe_surface surf_tmpl;
 229    int i;
 230
 231    /* It's hard to say whether window or screen should be created
 232     * first.  Different environments would prefer one or the other.
 233     *
 234     * Also, no easy way of querying supported formats if the screen
 235     * cannot be created first.
 236     */
 237    for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
 238       screen = graw_create_window_and_screen(0, 0, 300, 300,
 239                                              formats[i],
 240                                              &window);
 241       if (window && screen)
 242          break;
 243    }
 244    if (!screen || !window) {
 245       fprintf(stderr, "Unable to create window\n");
 246       exit(1);
 247    }
 248
 249    ctx = screen->context_create(screen, NULL);
 250    if (ctx == NULL)
 251       exit(3);
 252
 253    templat.target = PIPE_TEXTURE_2D;
 254    templat.format = formats[i];
 255    templat.width0 = WIDTH;
 256    templat.height0 = HEIGHT;
 257    templat.depth0 = 1;
 258    templat.array_size = 1;
 259    templat.last_level = 0;
 260    templat.nr_samples = 1;
 261    templat.bind = (PIPE_BIND_RENDER_TARGET |
 262                    PIPE_BIND_DISPLAY_TARGET);
 263
 264    tex = screen->resource_create(screen,
 265                                  &templat);
 266    if (tex == NULL)
 267       exit(4);
 268
 269    surf_tmpl.format = templat.format;
 270    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 271    surf_tmpl.u.tex.level = 0;
 272    surf_tmpl.u.tex.first_layer = 0;
 273    surf_tmpl.u.tex.last_layer = 0;
 274    surf = ctx->create_surface(ctx, tex, &surf_tmpl);
 275    if (surf == NULL)
 276       exit(5);
 277
 278    memset(&fb, 0, sizeof fb);
 279    fb.nr_cbufs = 1;
 280    fb.width = WIDTH;
 281    fb.height = HEIGHT;
 282    fb.cbufs[0] = surf;
 283
 284    ctx->set_framebuffer_state(ctx, &fb);
 285
 286    {
 287       struct pipe_blend_state blend;
 288       void *handle;
 289       memset(&blend, 0, sizeof blend);
 290       blend.rt[0].colormask = PIPE_MASK_RGBA;
 291       handle = ctx->create_blend_state(ctx, &blend);
 292       ctx->bind_blend_state(ctx, handle);
 293    }
 294
 295    {
 296       struct pipe_depth_stencil_alpha_state depthstencil;
 297       void *handle;
 298       memset(&depthstencil, 0, sizeof depthstencil);
 299       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 300       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 301    }
 302
 303    {
 304       struct pipe_rasterizer_state rasterizer;
 305       void *handle;
 306       memset(&rasterizer, 0, sizeof rasterizer);
 307       rasterizer.cull_face = PIPE_FACE_NONE;
 308       rasterizer.gl_rasterization_rules = 1;
 309       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 310       ctx->bind_rasterizer_state(ctx, handle);
 311    }
 312
 313    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 314    set_vertices();
 315    set_vertex_shader();
 316    set_fragment_shader();
 317 }
 318
 319
 320 static void options(int argc, char *argv[])
 321 {
 322    int i;
 323
 324    for (i = 1; i < argc;) {
 325       if (graw_parse_args(&i, argc, argv)) {
 326          continue;
 327       }
 328       if (strcmp(argv[i], "-e") == 0) {
 329          draw_elements = 1;
 330          i++;
 331       }
 332       else {
 333          i++;
 334       }
 335    }
 336    if (draw_elements)
 337       printf("Using pipe_context::draw_elements_instanced()\n");
 338    else
 339       printf("Using pipe_context::draw_arrays_instanced()\n");
 340 }
 341
 342
 343 int main( int argc, char *argv[] )
 344 {
 345    options(argc, argv);
 346
 347    init();
 348
 349    graw_set_display_func( draw );
 350    graw_main_loop();
 351    return 0;
 352 }