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