tri-instanced.c revision d4d62b6178c43cff9a0de522c4cf512109cb4b03 
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#include "util/u_draw_quad.h"
17
18
19enum pipe_format formats[] = {
20   PIPE_FORMAT_R8G8B8A8_UNORM,
21   PIPE_FORMAT_B8G8R8A8_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 void *window = NULL;
32
33struct vertex {
34   float position[4];
35   float color[4];
36};
37
38
39static 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 */
48static 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
67static 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
77static ushort indices[3] = { 0, 2, 1 };
78
79
80static 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
104static void set_vertices( void )
105{
106   struct pipe_vertex_element ve[3];
107   struct pipe_vertex_buffer vbuf[2];
108   struct pipe_index_buffer ibuf;
109   void *handle;
110
111   memset(ve, 0, sizeof ve);
112
113   /* pos */
114   ve[0].src_offset = Offset(struct vertex, position);
115   ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
116   ve[0].vertex_buffer_index = 0;
117
118   /* color */
119   ve[1].src_offset = Offset(struct vertex, color);
120   ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
121   ve[1].vertex_buffer_index = 0;
122
123   /* per-instance info */
124   ve[2].src_offset = 0;
125   ve[2].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
126   ve[2].vertex_buffer_index = 1;
127   ve[2].instance_divisor = 1;
128
129   handle = ctx->create_vertex_elements_state(ctx, 3, ve);
130   ctx->bind_vertex_elements_state(ctx, handle);
131
132
133   /* vertex data */
134   vbuf[0].stride = sizeof( struct vertex );
135   vbuf[0].max_index = sizeof(vertices) / vbuf[0].stride;
136   vbuf[0].buffer_offset = 0;
137   vbuf[0].buffer = screen->user_buffer_create(screen,
138                                               vertices,
139                                               sizeof(vertices),
140                                               PIPE_BIND_VERTEX_BUFFER);
141
142   /* instance data */
143   vbuf[1].stride = sizeof( inst_data[0] );
144   vbuf[1].max_index = sizeof(inst_data) / vbuf[1].stride;
145   vbuf[1].buffer_offset = 0;
146   vbuf[1].buffer = screen->user_buffer_create(screen,
147                                               inst_data,
148                                               sizeof(inst_data),
149                                               PIPE_BIND_VERTEX_BUFFER);
150
151
152   ctx->set_vertex_buffers(ctx, 2, vbuf);
153
154   /* index data */
155   ibuf.buffer = screen->user_buffer_create(screen,
156                                            indices,
157                                            sizeof(indices),
158                                            PIPE_BIND_VERTEX_BUFFER);
159   ibuf.offset = 0;
160   ibuf.index_size = 2;
161
162   ctx->set_index_buffer(ctx, &ibuf);
163
164}
165
166static void set_vertex_shader( void )
167{
168   void *handle;
169   const char *text =
170      "VERT\n"
171      "DCL IN[0]\n"
172      "DCL IN[1]\n"
173      "DCL IN[2]\n"
174      "DCL OUT[0], POSITION\n"
175      "DCL OUT[1], COLOR\n"
176      "  0: MOV OUT[1], IN[1]\n"
177      "  1: ADD OUT[0], IN[0], IN[2]\n"  /* add instance pos to vertex pos */
178      "  2: END\n";
179
180   handle = graw_parse_vertex_shader(ctx, text);
181   ctx->bind_vs_state(ctx, handle);
182}
183
184static void set_fragment_shader( void )
185{
186   void *handle;
187   const char *text =
188      "FRAG\n"
189      "DCL IN[0], COLOR, LINEAR\n"
190      "DCL OUT[0], COLOR\n"
191      "  0: MOV OUT[0], IN[0]\n"
192      "  1: END\n";
193
194   handle = graw_parse_fragment_shader(ctx, text);
195   ctx->bind_fs_state(ctx, handle);
196}
197
198
199static void draw( void )
200{
201   float clear_color[4] = {1,0,1,1};
202   struct pipe_draw_info info;
203
204   ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
205
206   util_draw_init_info(&info);
207   info.indexed = (draw_elements != 0);
208   info.mode = PIPE_PRIM_TRIANGLES;
209   info.start = 0;
210   info.count = 3;
211   /* draw NUM_INST triangles */
212   info.instance_count = NUM_INST;
213
214   ctx->draw_vbo(ctx, &info);
215
216   ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
217
218#if 0
219   /* At the moment, libgraw leaks out/makes available some of the
220    * symbols from gallium/auxiliary, including these debug helpers.
221    * Will eventually want to bless some of these paths, and lock the
222    * others down so they aren't accessible from test programs.
223    *
224    * This currently just happens to work on debug builds - a release
225    * build will probably fail to link here:
226    */
227   debug_dump_surface_bmp(ctx, "result.bmp", surf);
228#endif
229
230   screen->flush_frontbuffer(screen, surf, window);
231}
232
233
234static void init( void )
235{
236   struct pipe_framebuffer_state fb;
237   struct pipe_resource *tex, templat;
238   int i;
239
240   /* It's hard to say whether window or screen should be created
241    * first.  Different environments would prefer one or the other.
242    *
243    * Also, no easy way of querying supported formats if the screen
244    * cannot be created first.
245    */
246   for (i = 0;
247        window == NULL && formats[i] != PIPE_FORMAT_NONE;
248        i++) {
249
250      screen = graw_create_window_and_screen(0,0,300,300,
251                                             formats[i],
252                                             &window);
253   }
254
255   ctx = screen->context_create(screen, NULL);
256   if (ctx == NULL)
257      exit(3);
258
259   templat.target = PIPE_TEXTURE_2D;
260   templat.format = formats[i];
261   templat.width0 = WIDTH;
262   templat.height0 = HEIGHT;
263   templat.depth0 = 1;
264   templat.last_level = 0;
265   templat.nr_samples = 1;
266   templat.bind = (PIPE_BIND_RENDER_TARGET |
267                   PIPE_BIND_DISPLAY_TARGET);
268
269   tex = screen->resource_create(screen,
270                                 &templat);
271   if (tex == NULL)
272      exit(4);
273
274   surf = screen->get_tex_surface(screen, tex, 0, 0, 0,
275                                  PIPE_BIND_RENDER_TARGET |
276                                  PIPE_BIND_DISPLAY_TARGET);
277   if (surf == NULL)
278      exit(5);
279
280   memset(&fb, 0, sizeof fb);
281   fb.nr_cbufs = 1;
282   fb.width = WIDTH;
283   fb.height = HEIGHT;
284   fb.cbufs[0] = surf;
285
286   ctx->set_framebuffer_state(ctx, &fb);
287
288   {
289      struct pipe_blend_state blend;
290      void *handle;
291      memset(&blend, 0, sizeof blend);
292      blend.rt[0].colormask = PIPE_MASK_RGBA;
293      handle = ctx->create_blend_state(ctx, &blend);
294      ctx->bind_blend_state(ctx, handle);
295   }
296
297   {
298      struct pipe_depth_stencil_alpha_state depthstencil;
299      void *handle;
300      memset(&depthstencil, 0, sizeof depthstencil);
301      handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
302      ctx->bind_depth_stencil_alpha_state(ctx, handle);
303   }
304
305   {
306      struct pipe_rasterizer_state rasterizer;
307      void *handle;
308      memset(&rasterizer, 0, sizeof rasterizer);
309      rasterizer.cull_face = PIPE_FACE_NONE;
310      rasterizer.gl_rasterization_rules = 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
322static void options(int argc, char *argv[])
323{
324   int i;
325   for (i = 1; i < argc; i++) {
326      if (strcmp(argv[i], "-e") == 0)
327         draw_elements = 1;
328   }
329   if (draw_elements)
330      printf("Using pipe_context::draw_elements_instanced()\n");
331   else
332      printf("Using pipe_context::draw_arrays_instanced()\n");
333}
334
335
336int main( int argc, char *argv[] )
337{
338   options(argc, argv);
339
340   init();
341
342   graw_set_display_func( draw );
343   graw_main_loop();
344   return 0;
345}
346