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 #include "util/u_inlines.h"
  17
  18
  19 enum pipe_format formats[] = {
  20    PIPE_FORMAT_R8G8B8A8_UNORM,
  21    PIPE_FORMAT_B8G8R8A8_UNORM,
  22    PIPE_FORMAT_NONE
  23 };
  24
  25 static const int WIDTH = 300;
  26 static const int HEIGHT = 300;
  27
  28 static struct pipe_screen *screen = NULL;
  29 static struct pipe_context *ctx = NULL;
  30 static struct pipe_surface *surf = NULL;
  31 static struct pipe_resource *tex = NULL;
  32 static void *window = NULL;
  33
  34 struct vertex {
  35    float position[4];
  36    float color[4];
  37 };
  38
  39
  40 static int draw_elements = 0;
  41
  42
  43 /**
  44  * Vertex data.
  45  * Each vertex has three attributes: position, color and translation.
  46  * The translation attribute is a per-instance attribute.  See
  47  * "instance_divisor" below.
  48  */
  49 static struct vertex vertices[4] =
  50 {
  51    {
  52       { 0.0f, -0.3f, 0.0f, 1.0f },  /* pos */
  53       { 1.0f, 0.0f, 0.0f, 1.0f }    /* color */
  54    },
  55    {
  56       { -0.2f, 0.3f, 0.0f, 1.0f },
  57       { 0.0f, 1.0f, 0.0f, 1.0f }
  58    },
  59    {
  60       { 0.2f, 0.3f, 0.0f, 1.0f },
  61       { 0.0f, 0.0f, 1.0f, 1.0f }
  62    }
  63 };
  64
  65
  66 #define NUM_INST 5
  67
  68 static float inst_data[NUM_INST][4] =
  69 {
  70    { -0.50f, 0.4f, 0.0f, 0.0f },
  71    { -0.25f, 0.1f, 0.0f, 0.0f },
  72    { 0.00f, 0.2f, 0.0f, 0.0f },
  73    { 0.25f, 0.1f, 0.0f, 0.0f },
  74    { 0.50f, 0.3f, 0.0f, 0.0f }
  75 };
  76
  77
  78 static ushort indices[3] = { 0, 2, 1 };
  79
  80
  81 static void set_viewport( float x, float y,
  82                           float width, float height,
  83                           float near, float far)
  84 {
  85    float z = far;
  86    float half_width = (float)width / 2.0f;
  87    float half_height = (float)height / 2.0f;
  88    float half_depth = ((float)far - (float)near) / 2.0f;
  89    struct pipe_viewport_state vp;
  90
  91    vp.scale[0] = half_width;
  92    vp.scale[1] = half_height;
  93    vp.scale[2] = half_depth;
  94    vp.scale[3] = 1.0f;
  95
  96    vp.translate[0] = half_width + x;
  97    vp.translate[1] = half_height + y;
  98    vp.translate[2] = half_depth + z;
  99    vp.translate[3] = 0.0f;
 100
 101    ctx->set_viewport_state( ctx, &vp );
 102 }
 103
 104
 105 static void set_vertices( void )
 106 {
 107    struct pipe_vertex_element ve[3];
 108    struct pipe_vertex_buffer vbuf[2];
 109    struct pipe_index_buffer ibuf;
 110    void *handle;
 111
 112    memset(ve, 0, sizeof ve);
 113
 114    /* pos */
 115    ve[0].src_offset = Offset(struct vertex, position);
 116    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 117    ve[0].vertex_buffer_index = 0;
 118
 119    /* color */
 120    ve[1].src_offset = Offset(struct vertex, color);
 121    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 122    ve[1].vertex_buffer_index = 0;
 123
 124    /* per-instance info */
 125    ve[2].src_offset = 0;
 126    ve[2].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 127    ve[2].vertex_buffer_index = 1;
 128    ve[2].instance_divisor = 1;
 129
 130    handle = ctx->create_vertex_elements_state(ctx, 3, ve);
 131    ctx->bind_vertex_elements_state(ctx, handle);
 132
 133
 134    /* vertex data */
 135    vbuf[0].stride = sizeof( struct vertex );
 136    vbuf[0].buffer_offset = 0;
 137    vbuf[0].buffer = pipe_buffer_create_with_data(ctx,
 138                                                  PIPE_BIND_VERTEX_BUFFER,
 139                                                  PIPE_USAGE_STATIC,
 140                                                  sizeof(vertices),
 141                                                  vertices);
 142
 143    /* instance data */
 144    vbuf[1].stride = sizeof( inst_data[0] );
 145    vbuf[1].buffer_offset = 0;
 146    vbuf[1].buffer = pipe_buffer_create_with_data(ctx,
 147                                                  PIPE_BIND_VERTEX_BUFFER,
 148                                                  PIPE_USAGE_STATIC,
 149                                                  sizeof(inst_data),
 150                                                  inst_data);
 151
 152    ctx->set_vertex_buffers(ctx, 2, vbuf);
 153
 154    /* index data */
 155    ibuf.buffer = pipe_buffer_create_with_data(ctx,
 156                                               PIPE_BIND_INDEX_BUFFER,
 157                                               PIPE_USAGE_STATIC,
 158                                               sizeof(indices),
 159                                               indices);
 160    ibuf.offset = 0;
 161    ibuf.index_size = 2;
 162
 163    ctx->set_index_buffer(ctx, &ibuf);
 164
 165 }
 166
 167 static void set_vertex_shader( void )
 168 {
 169    void *handle;
 170    const char *text =
 171       "VERT\n"
 172       "DCL IN[0]\n"
 173       "DCL IN[1]\n"
 174       "DCL IN[2]\n"
 175       "DCL OUT[0], POSITION\n"
 176       "DCL OUT[1], COLOR\n"
 177       "  0: MOV OUT[1], IN[1]\n"
 178       "  1: ADD OUT[0], IN[0], IN[2]\n"  /* add instance pos to vertex pos */
 179       "  2: END\n";
 180
 181    handle = graw_parse_vertex_shader(ctx, text);
 182    ctx->bind_vs_state(ctx, handle);
 183 }
 184
 185 static void set_fragment_shader( void )
 186 {
 187    void *handle;
 188    const char *text =
 189       "FRAG\n"
 190       "DCL IN[0], COLOR, LINEAR\n"
 191       "DCL OUT[0], COLOR\n"
 192       "  0: MOV OUT[0], IN[0]\n"
 193       "  1: END\n";
 194
 195    handle = graw_parse_fragment_shader(ctx, text);
 196    ctx->bind_fs_state(ctx, handle);
 197 }
 198
 199
 200 static void draw( void )
 201 {
 202    union pipe_color_union clear_color = { {1,0,1,1} };
 203    struct pipe_draw_info info;
 204
 205    ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
 206
 207    util_draw_init_info(&info);
 208    info.indexed = (draw_elements != 0);
 209    info.mode = PIPE_PRIM_TRIANGLES;
 210    info.start = 0;
 211    info.count = 3;
 212    /* draw NUM_INST triangles */
 213    info.instance_count = NUM_INST;
 214
 215    ctx->draw_vbo(ctx, &info);
 216
 217    ctx->flush(ctx, NULL);
 218
 219    graw_save_surface_to_file(ctx, surf, NULL);
 220
 221    screen->flush_frontbuffer(screen, tex, 0, 0, window);
 222 }
 223
 224
 225 static void init( void )
 226 {
 227    struct pipe_framebuffer_state fb;
 228    struct pipe_resource templat;
 229    struct pipe_surface surf_tmpl;
 230    int i;
 231
 232    /* It's hard to say whether window or screen should be created
 233     * first.  Different environments would prefer one or the other.
 234     *
 235     * Also, no easy way of querying supported formats if the screen
 236     * cannot be created first.
 237     */
 238    for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
 239       screen = graw_create_window_and_screen(0, 0, 300, 300,
 240                                              formats[i],
 241                                              &window);
 242       if (window && screen)
 243          break;
 244    }
 245    if (!screen || !window) {
 246       fprintf(stderr, "Unable to create window\n");
 247       exit(1);
 248    }
 249
 250    ctx = screen->context_create(screen, NULL);
 251    if (ctx == NULL)
 252       exit(3);
 253
 254    templat.target = PIPE_TEXTURE_2D;
 255    templat.format = formats[i];
 256    templat.width0 = WIDTH;
 257    templat.height0 = HEIGHT;
 258    templat.depth0 = 1;
 259    templat.array_size = 1;
 260    templat.last_level = 0;
 261    templat.nr_samples = 1;
 262    templat.bind = (PIPE_BIND_RENDER_TARGET |
 263                    PIPE_BIND_DISPLAY_TARGET);
 264
 265    tex = screen->resource_create(screen,
 266                                  &templat);
 267    if (tex == NULL)
 268       exit(4);
 269
 270    surf_tmpl.format = templat.format;
 271    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 272    surf_tmpl.u.tex.level = 0;
 273    surf_tmpl.u.tex.first_layer = 0;
 274    surf_tmpl.u.tex.last_layer = 0;
 275    surf = ctx->create_surface(ctx, tex, &surf_tmpl);
 276    if (surf == NULL)
 277       exit(5);
 278
 279    memset(&fb, 0, sizeof fb);
 280    fb.nr_cbufs = 1;
 281    fb.width = WIDTH;
 282    fb.height = HEIGHT;
 283    fb.cbufs[0] = surf;
 284
 285    ctx->set_framebuffer_state(ctx, &fb);
 286
 287    {
 288       struct pipe_blend_state blend;
 289       void *handle;
 290       memset(&blend, 0, sizeof blend);
 291       blend.rt[0].colormask = PIPE_MASK_RGBA;
 292       handle = ctx->create_blend_state(ctx, &blend);
 293       ctx->bind_blend_state(ctx, handle);
 294    }
 295
 296    {
 297       struct pipe_depth_stencil_alpha_state depthstencil;
 298       void *handle;
 299       memset(&depthstencil, 0, sizeof depthstencil);
 300       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 301       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 302    }
 303
 304    {
 305       struct pipe_rasterizer_state rasterizer;
 306       void *handle;
 307       memset(&rasterizer, 0, sizeof rasterizer);
 308       rasterizer.cull_face = PIPE_FACE_NONE;
 309       rasterizer.gl_rasterization_rules = 1;
 310       rasterizer.depth_clip = 1;
 311       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 312       ctx->bind_rasterizer_state(ctx, handle);
 313    }
 314
 315    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 316    set_vertices();
 317    set_vertex_shader();
 318    set_fragment_shader();
 319 }
 320
 321
 322 static void options(int argc, char *argv[])
 323 {
 324    int i;
 325
 326    for (i = 1; i < argc;) {
 327       if (graw_parse_args(&i, argc, argv)) {
 328          continue;
 329       }
 330       if (strcmp(argv[i], "-e") == 0) {
 331          draw_elements = 1;
 332          i++;
 333       }
 334       else {
 335          i++;
 336       }
 337    }
 338    if (draw_elements)
 339       printf("Using pipe_context::draw_elements_instanced()\n");
 340    else
 341       printf("Using pipe_context::draw_arrays_instanced()\n");
 342 }
 343
 344
 345 int main( int argc, char *argv[] )
 346 {
 347    options(argc, argv);
 348
 349    init();
 350
 351    graw_set_display_func( draw );
 352    graw_main_loop();
 353    return 0;
 354 }