tri-instanced.c revision 848b8605 
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
19enum pipe_format formats[] = {
20   PIPE_FORMAT_RGBA8888_UNORM,
21   PIPE_FORMAT_BGRA8888_UNORM,
22   PIPE_FORMAT_NONE
23};
24
25static const int WIDTH = 300;
26static const int HEIGHT = 300;
27
28static struct pipe_screen *screen = NULL;
29static struct pipe_context *ctx = NULL;
30static struct pipe_surface *surf = NULL;
31static struct pipe_resource *tex = NULL;
32static void *window = NULL;
33
34struct vertex {
35   float position[4];
36   float color[4];
37};
38
39
40static 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 */
49static 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
68static 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
78static ushort indices[3] = { 0, 2, 1 };
79
80
81static 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_states( ctx, 0, 1, &vp );
102}
103
104
105static 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   memset(&vbuf, 0, sizeof vbuf);
134
135   /* vertex data */
136   vbuf[0].stride = sizeof( struct vertex );
137   vbuf[0].buffer_offset = 0;
138   vbuf[0].buffer = pipe_buffer_create_with_data(ctx,
139                                                 PIPE_BIND_VERTEX_BUFFER,
140                                                 PIPE_USAGE_DEFAULT,
141                                                 sizeof(vertices),
142                                                 vertices);
143
144   /* instance data */
145   vbuf[1].stride = sizeof( inst_data[0] );
146   vbuf[1].buffer_offset = 0;
147   vbuf[1].buffer = pipe_buffer_create_with_data(ctx,
148                                                 PIPE_BIND_VERTEX_BUFFER,
149                                                 PIPE_USAGE_DEFAULT,
150                                                 sizeof(inst_data),
151                                                 inst_data);
152
153   ctx->set_vertex_buffers(ctx, 0, 2, vbuf);
154
155   /* index data */
156   ibuf.buffer = pipe_buffer_create_with_data(ctx,
157                                              PIPE_BIND_INDEX_BUFFER,
158                                              PIPE_USAGE_DEFAULT,
159                                              sizeof(indices),
160                                              indices);
161   ibuf.offset = 0;
162   ibuf.index_size = 2;
163
164   ctx->set_index_buffer(ctx, &ibuf);
165
166}
167
168static void set_vertex_shader( void )
169{
170   void *handle;
171   const char *text =
172      "VERT\n"
173      "DCL IN[0]\n"
174      "DCL IN[1]\n"
175      "DCL IN[2]\n"
176      "DCL OUT[0], POSITION\n"
177      "DCL OUT[1], COLOR\n"
178      "  0: MOV OUT[1], IN[1]\n"
179      "  1: ADD OUT[0], IN[0], IN[2]\n"  /* add instance pos to vertex pos */
180      "  2: END\n";
181
182   handle = graw_parse_vertex_shader(ctx, text);
183   ctx->bind_vs_state(ctx, handle);
184}
185
186static void set_fragment_shader( void )
187{
188   void *handle;
189   const char *text =
190      "FRAG\n"
191      "DCL IN[0], COLOR, LINEAR\n"
192      "DCL OUT[0], COLOR\n"
193      "  0: MOV OUT[0], IN[0]\n"
194      "  1: END\n";
195
196   handle = graw_parse_fragment_shader(ctx, text);
197   ctx->bind_fs_state(ctx, handle);
198}
199
200
201static void draw( void )
202{
203   union pipe_color_union clear_color = { {1,0,1,1} };
204   struct pipe_draw_info info;
205
206   ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
207
208   util_draw_init_info(&info);
209   info.indexed = (draw_elements != 0);
210   info.mode = PIPE_PRIM_TRIANGLES;
211   info.start = 0;
212   info.count = 3;
213   /* draw NUM_INST triangles */
214   info.instance_count = NUM_INST;
215
216   ctx->draw_vbo(ctx, &info);
217
218   ctx->flush(ctx, NULL, 0);
219
220   graw_save_surface_to_file(ctx, surf, NULL);
221
222   screen->flush_frontbuffer(screen, tex, 0, 0, window, NULL);
223}
224
225
226static void init( void )
227{
228   struct pipe_framebuffer_state fb;
229   struct pipe_resource templat;
230   struct pipe_surface surf_tmpl;
231   int i;
232
233   /* It's hard to say whether window or screen should be created
234    * first.  Different environments would prefer one or the other.
235    *
236    * Also, no easy way of querying supported formats if the screen
237    * cannot be created first.
238    */
239   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
240      screen = graw_create_window_and_screen(0, 0, 300, 300,
241                                             formats[i],
242                                             &window);
243      if (window && screen)
244         break;
245   }
246   if (!screen || !window) {
247      fprintf(stderr, "Unable to create window\n");
248      exit(1);
249   }
250
251   ctx = screen->context_create(screen, NULL);
252   if (ctx == NULL)
253      exit(3);
254
255   templat.target = PIPE_TEXTURE_2D;
256   templat.format = formats[i];
257   templat.width0 = WIDTH;
258   templat.height0 = HEIGHT;
259   templat.depth0 = 1;
260   templat.array_size = 1;
261   templat.last_level = 0;
262   templat.nr_samples = 1;
263   templat.bind = (PIPE_BIND_RENDER_TARGET |
264                   PIPE_BIND_DISPLAY_TARGET);
265
266   tex = screen->resource_create(screen,
267                                 &templat);
268   if (tex == NULL)
269      exit(4);
270
271   surf_tmpl.format = templat.format;
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.half_pixel_center = 1;
310      rasterizer.bottom_edge_rule = 1;
311      rasterizer.depth_clip = 1;
312      handle = ctx->create_rasterizer_state(ctx, &rasterizer);
313      ctx->bind_rasterizer_state(ctx, handle);
314   }
315
316   set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
317   set_vertices();
318   set_vertex_shader();
319   set_fragment_shader();
320}
321
322
323static void options(int argc, char *argv[])
324{
325   int i;
326
327   for (i = 1; i < argc;) {
328      if (graw_parse_args(&i, argc, argv)) {
329         continue;
330      }
331      if (strcmp(argv[i], "-e") == 0) {
332         draw_elements = 1;
333         i++;
334      }
335      else {
336         i++;
337      }
338   }
339   if (draw_elements)
340      printf("Using pipe_context::draw_elements_instanced()\n");
341   else
342      printf("Using pipe_context::draw_arrays_instanced()\n");
343}
344
345
346int main( int argc, char *argv[] )
347{
348   options(argc, argv);
349
350   init();
351
352   graw_set_display_func( draw );
353   graw_main_loop();
354   return 0;
355}
356