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

   1 /*
   2  * Test draw instancing.
   3  */
   4
   5 #include "state_tracker/graw.h"
   6 #include "pipe/p_screen.h"
   7 #include "pipe/p_context.h"
   8 #include "pipe/p_state.h"
   9 #include "pipe/p_defines.h"
  10
  11 #include "util/u_debug.h"       /* debug_dump_surface_bmp() */
  12 #include "util/u_memory.h"      /* Offset() */
  13
  14 enum pipe_format formats[] = {
  15    PIPE_FORMAT_R8G8B8A8_UNORM,
  16    PIPE_FORMAT_B8G8R8A8_UNORM,
  17    PIPE_FORMAT_NONE
  18 };
  19
  20 static const int WIDTH = 300;
  21 static const int HEIGHT = 300;
  22
  23 static struct pipe_screen *screen = NULL;
  24 static struct pipe_context *ctx = NULL;
  25 static struct pipe_surface *surf = NULL;
  26 static void *window = NULL;
  27
  28 struct vertex {
  29    float position[4];
  30    float color[4];
  31 };
  32
  33
  34 /**
  35  * Vertex data.
  36  * Each vertex has three attributes: position, color and translation.
  37  * The translation attribute is a per-instance attribute.  See
  38  * "instance_divisor" below.
  39  */
  40 static struct vertex vertices[4] =
  41 {
  42    {
  43       { 0.0f, -0.3f, 0.0f, 1.0f },  /* pos */
  44       { 1.0f, 0.0f, 0.0f, 1.0f }    /* color */
  45    },
  46    {
  47       { -0.2f, 0.3f, 0.0f, 1.0f },
  48       { 0.0f, 1.0f, 0.0f, 1.0f }
  49    },
  50    {
  51       { 0.2f, 0.3f, 0.0f, 1.0f },
  52       { 0.0f, 0.0f, 1.0f, 1.0f }
  53    }
  54 };
  55
  56
  57 #define NUM_INST 5
  58
  59 static float inst_data[NUM_INST][4] =
  60 {
  61    { -0.50f, 0.4f, 0.0f, 0.0f },
  62    { -0.25f, 0.1f, 0.0f, 0.0f },
  63    { 0.00f, 0.2f, 0.0f, 0.0f },
  64    { 0.25f, 0.1f, 0.0f, 0.0f },
  65    { 0.50f, 0.3f, 0.0f, 0.0f }
  66 };
  67
  68
  69 static void set_viewport( float x, float y,
  70                           float width, float height,
  71                           float near, float far)
  72 {
  73    float z = far;
  74    float half_width = (float)width / 2.0f;
  75    float half_height = (float)height / 2.0f;
  76    float half_depth = ((float)far - (float)near) / 2.0f;
  77    struct pipe_viewport_state vp;
  78
  79    vp.scale[0] = half_width;
  80    vp.scale[1] = half_height;
  81    vp.scale[2] = half_depth;
  82    vp.scale[3] = 1.0f;
  83
  84    vp.translate[0] = half_width + x;
  85    vp.translate[1] = half_height + y;
  86    vp.translate[2] = half_depth + z;
  87    vp.translate[3] = 0.0f;
  88
  89    ctx->set_viewport_state( ctx, &vp );
  90 }
  91
  92
  93 static void set_vertices( void )
  94 {
  95    struct pipe_vertex_element ve[3];
  96    struct pipe_vertex_buffer vbuf[2];
  97    void *handle;
  98
  99    memset(ve, 0, sizeof ve);
 100
 101    /* pos */
 102    ve[0].src_offset = Offset(struct vertex, position);
 103    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 104    ve[0].vertex_buffer_index = 0;
 105
 106    /* color */
 107    ve[1].src_offset = Offset(struct vertex, color);
 108    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 109    ve[1].vertex_buffer_index = 0;
 110
 111    /* per-instance info */
 112    ve[2].src_offset = 0;
 113    ve[2].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 114    ve[2].vertex_buffer_index = 1;
 115    ve[2].instance_divisor = 1;
 116
 117    handle = ctx->create_vertex_elements_state(ctx, 3, ve);
 118    ctx->bind_vertex_elements_state(ctx, handle);
 119
 120
 121    /* vertex data */
 122    vbuf[0].stride = sizeof( struct vertex );
 123    vbuf[0].max_index = sizeof(vertices) / vbuf[0].stride;
 124    vbuf[0].buffer_offset = 0;
 125    vbuf[0].buffer = screen->user_buffer_create(screen,
 126                                                vertices,
 127                                                sizeof(vertices),
 128                                                PIPE_BIND_VERTEX_BUFFER);
 129
 130    /* instance data */
 131    vbuf[1].stride = sizeof( inst_data[0] );
 132    vbuf[1].max_index = sizeof(inst_data) / vbuf[1].stride;
 133    vbuf[1].buffer_offset = 0;
 134    vbuf[1].buffer = screen->user_buffer_create(screen,
 135                                                inst_data,
 136                                                sizeof(inst_data),
 137                                                PIPE_BIND_VERTEX_BUFFER);
 138
 139
 140    ctx->set_vertex_buffers(ctx, 2, vbuf);
 141 }
 142
 143 static void set_vertex_shader( void )
 144 {
 145    void *handle;
 146    const char *text =
 147       "VERT\n"
 148       "DCL IN[0]\n"
 149       "DCL IN[1]\n"
 150       "DCL IN[2]\n"
 151       "DCL OUT[0], POSITION\n"
 152       "DCL OUT[1], COLOR\n"
 153       "  0: MOV OUT[1], IN[1]\n"
 154       "  1: ADD OUT[0], IN[0], IN[2]\n"  /* add instance pos to vertex pos */
 155       "  2: END\n";
 156
 157    handle = graw_parse_vertex_shader(ctx, text);
 158    ctx->bind_vs_state(ctx, handle);
 159 }
 160
 161 static void set_fragment_shader( void )
 162 {
 163    void *handle;
 164    const char *text =
 165       "FRAG\n"
 166       "DCL IN[0], COLOR, LINEAR\n"
 167       "DCL OUT[0], COLOR\n"
 168       "  0: MOV OUT[0], IN[0]\n"
 169       "  1: END\n";
 170
 171    handle = graw_parse_fragment_shader(ctx, text);
 172    ctx->bind_fs_state(ctx, handle);
 173 }
 174
 175
 176 static void draw( void )
 177 {
 178    float clear_color[4] = {1,0,1,1};
 179
 180    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 181    /* draw NUM_INST triangles */
 182    ctx->draw_arrays_instanced(ctx, PIPE_PRIM_TRIANGLES, 0, 3, 0, NUM_INST);
 183    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 184
 185 #if 0
 186    /* At the moment, libgraw leaks out/makes available some of the
 187     * symbols from gallium/auxiliary, including these debug helpers.
 188     * Will eventually want to bless some of these paths, and lock the
 189     * others down so they aren't accessible from test programs.
 190     *
 191     * This currently just happens to work on debug builds - a release
 192     * build will probably fail to link here:
 193     */
 194    debug_dump_surface_bmp(ctx, "result.bmp", surf);
 195 #endif
 196
 197    screen->flush_frontbuffer(screen, surf, window);
 198 }
 199
 200
 201 static void init( void )
 202 {
 203    struct pipe_framebuffer_state fb;
 204    struct pipe_resource *tex, templat;
 205    int i;
 206
 207    /* It's hard to say whether window or screen should be created
 208     * first.  Different environments would prefer one or the other.
 209     *
 210     * Also, no easy way of querying supported formats if the screen
 211     * cannot be created first.
 212     */
 213    for (i = 0;
 214         window == NULL && formats[i] != PIPE_FORMAT_NONE;
 215         i++) {
 216
 217       screen = graw_create_window_and_screen(0,0,300,300,
 218                                              formats[i],
 219                                              &window);
 220    }
 221
 222    ctx = screen->context_create(screen, NULL);
 223    if (ctx == NULL)
 224       exit(3);
 225
 226    templat.target = PIPE_TEXTURE_2D;
 227    templat.format = formats[i];
 228    templat.width0 = WIDTH;
 229    templat.height0 = HEIGHT;
 230    templat.depth0 = 1;
 231    templat.last_level = 0;
 232    templat.nr_samples = 1;
 233    templat.bind = (PIPE_BIND_RENDER_TARGET |
 234                    PIPE_BIND_DISPLAY_TARGET);
 235
 236    tex = screen->resource_create(screen,
 237                                  &templat);
 238    if (tex == NULL)
 239       exit(4);
 240
 241    surf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 242                                   PIPE_BIND_RENDER_TARGET |
 243                                   PIPE_BIND_DISPLAY_TARGET);
 244    if (surf == NULL)
 245       exit(5);
 246
 247    memset(&fb, 0, sizeof fb);
 248    fb.nr_cbufs = 1;
 249    fb.width = WIDTH;
 250    fb.height = HEIGHT;
 251    fb.cbufs[0] = surf;
 252
 253    ctx->set_framebuffer_state(ctx, &fb);
 254
 255    {
 256       struct pipe_blend_state blend;
 257       void *handle;
 258       memset(&blend, 0, sizeof blend);
 259       blend.rt[0].colormask = PIPE_MASK_RGBA;
 260       handle = ctx->create_blend_state(ctx, &blend);
 261       ctx->bind_blend_state(ctx, handle);
 262    }
 263
 264    {
 265       struct pipe_depth_stencil_alpha_state depthstencil;
 266       void *handle;
 267       memset(&depthstencil, 0, sizeof depthstencil);
 268       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 269       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 270    }
 271
 272    {
 273       struct pipe_rasterizer_state rasterizer;
 274       void *handle;
 275       memset(&rasterizer, 0, sizeof rasterizer);
 276       rasterizer.cull_face = PIPE_FACE_NONE;
 277       rasterizer.gl_rasterization_rules = 1;
 278       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 279       ctx->bind_rasterizer_state(ctx, handle);
 280    }
 281
 282    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 283    set_vertices();
 284    set_vertex_shader();
 285    set_fragment_shader();
 286 }
 287
 288
 289 int main( int argc, char *argv[] )
 290 {
 291    init();
 292
 293    graw_set_display_func( draw );
 294    graw_main_loop();
 295    return 0;
 296 }