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_debug.h"       /* debug_dump_surface_bmp() */
  15 #include "util/u_memory.h"      /* Offset() */
  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 *indexBuffer = 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    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    indexBuffer = screen->user_buffer_create(screen,
 155                                             indices,
 156                                             sizeof(indices),
 157                                             PIPE_BIND_VERTEX_BUFFER);
 158
 159
 160 }
 161
 162 static void set_vertex_shader( void )
 163 {
 164    void *handle;
 165    const char *text =
 166       "VERT\n"
 167       "DCL IN[0]\n"
 168       "DCL IN[1]\n"
 169       "DCL IN[2]\n"
 170       "DCL OUT[0], POSITION\n"
 171       "DCL OUT[1], COLOR\n"
 172       "  0: MOV OUT[1], IN[1]\n"
 173       "  1: ADD OUT[0], IN[0], IN[2]\n"  /* add instance pos to vertex pos */
 174       "  2: END\n";
 175
 176    handle = graw_parse_vertex_shader(ctx, text);
 177    ctx->bind_vs_state(ctx, handle);
 178 }
 179
 180 static void set_fragment_shader( void )
 181 {
 182    void *handle;
 183    const char *text =
 184       "FRAG\n"
 185       "DCL IN[0], COLOR, LINEAR\n"
 186       "DCL OUT[0], COLOR\n"
 187       "  0: MOV OUT[0], IN[0]\n"
 188       "  1: END\n";
 189
 190    handle = graw_parse_fragment_shader(ctx, text);
 191    ctx->bind_fs_state(ctx, handle);
 192 }
 193
 194
 195 static void draw( void )
 196 {
 197    float clear_color[4] = {1,0,1,1};
 198
 199    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 200
 201    /* draw NUM_INST triangles */
 202    if (draw_elements)
 203       ctx->draw_elements_instanced(ctx, indexBuffer, 2,
 204                                    0, /* indexBias */
 205                                    PIPE_PRIM_TRIANGLES,
 206                                    0, 3, /* start, count */
 207                                    0, NUM_INST); /* startInst, instCount */
 208    else
 209       ctx->draw_arrays_instanced(ctx, PIPE_PRIM_TRIANGLES, 0, 3, 0, NUM_INST);
 210
 211    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 212
 213 #if 0
 214    /* At the moment, libgraw leaks out/makes available some of the
 215     * symbols from gallium/auxiliary, including these debug helpers.
 216     * Will eventually want to bless some of these paths, and lock the
 217     * others down so they aren't accessible from test programs.
 218     *
 219     * This currently just happens to work on debug builds - a release
 220     * build will probably fail to link here:
 221     */
 222    debug_dump_surface_bmp(ctx, "result.bmp", surf);
 223 #endif
 224
 225    screen->flush_frontbuffer(screen, surf, window);
 226 }
 227
 228
 229 static void init( void )
 230 {
 231    struct pipe_framebuffer_state fb;
 232    struct pipe_resource *tex, templat;
 233    int i;
 234
 235    /* It's hard to say whether window or screen should be created
 236     * first.  Different environments would prefer one or the other.
 237     *
 238     * Also, no easy way of querying supported formats if the screen
 239     * cannot be created first.
 240     */
 241    for (i = 0;
 242         window == NULL && formats[i] != PIPE_FORMAT_NONE;
 243         i++) {
 244
 245       screen = graw_create_window_and_screen(0,0,300,300,
 246                                              formats[i],
 247                                              &window);
 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.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 = screen->get_tex_surface(screen, tex, 0, 0, 0,
 270                                   PIPE_BIND_RENDER_TARGET |
 271                                   PIPE_BIND_DISPLAY_TARGET);
 272    if (surf == NULL)
 273       exit(5);
 274
 275    memset(&fb, 0, sizeof fb);
 276    fb.nr_cbufs = 1;
 277    fb.width = WIDTH;
 278    fb.height = HEIGHT;
 279    fb.cbufs[0] = surf;
 280
 281    ctx->set_framebuffer_state(ctx, &fb);
 282
 283    {
 284       struct pipe_blend_state blend;
 285       void *handle;
 286       memset(&blend, 0, sizeof blend);
 287       blend.rt[0].colormask = PIPE_MASK_RGBA;
 288       handle = ctx->create_blend_state(ctx, &blend);
 289       ctx->bind_blend_state(ctx, handle);
 290    }
 291
 292    {
 293       struct pipe_depth_stencil_alpha_state depthstencil;
 294       void *handle;
 295       memset(&depthstencil, 0, sizeof depthstencil);
 296       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 297       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 298    }
 299
 300    {
 301       struct pipe_rasterizer_state rasterizer;
 302       void *handle;
 303       memset(&rasterizer, 0, sizeof rasterizer);
 304       rasterizer.cull_face = PIPE_FACE_NONE;
 305       rasterizer.gl_rasterization_rules = 1;
 306       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 307       ctx->bind_rasterizer_state(ctx, handle);
 308    }
 309
 310    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 311    set_vertices();
 312    set_vertex_shader();
 313    set_fragment_shader();
 314 }
 315
 316
 317 static void options(int argc, char *argv[])
 318 {
 319    int i;
 320    for (i = 1; i < argc; i++) {
 321       if (strcmp(argv[i], "-e") == 0)
 322          draw_elements = 1;
 323    }
 324    if (draw_elements)
 325       printf("Using pipe_context::draw_elements_instanced()\n");
 326    else
 327       printf("Using pipe_context::draw_arrays_instanced()\n");
 328 }
 329
 330
 331 int main( int argc, char *argv[] )
 332 {
 333    options(argc, argv);
 334
 335    init();
 336
 337    graw_set_display_func( draw );
 338    graw_main_loop();
 339    return 0;
 340 }