tri.c revision 7e02303497237cde958c28608477d0c355a8038b 
1/* Display a cleared blue window.  This demo has no dependencies on
2 * any utility code, just the graw interface and gallium.
3 */
4
5#include <stdio.h>
6
7#include "state_tracker/graw.h"
8#include "pipe/p_screen.h"
9#include "pipe/p_context.h"
10#include "pipe/p_state.h"
11#include "pipe/p_defines.h"
12
13#include "util/u_memory.h"      /* Offset() */
14#include "util/u_draw_quad.h"
15
16enum pipe_format formats[] = {
17   PIPE_FORMAT_R8G8B8A8_UNORM,
18   PIPE_FORMAT_B8G8R8A8_UNORM,
19   PIPE_FORMAT_NONE
20};
21
22static const int WIDTH = 300;
23static const int HEIGHT = 300;
24
25static struct pipe_screen *screen = NULL;
26static struct pipe_context *ctx = NULL;
27static struct pipe_surface *surf = NULL;
28static struct pipe_resource *tex = NULL;
29static void *window = NULL;
30
31struct vertex {
32   float position[4];
33   float color[4];
34};
35
36static struct vertex vertices[3] =
37{
38   {
39      { 0.0f, -0.9f, 0.0f, 1.0f },
40      { 1.0f, 0.0f, 0.0f, 1.0f }
41   },
42   {
43      { -0.9f, 0.9f, 0.0f, 1.0f },
44      { 0.0f, 1.0f, 0.0f, 1.0f }
45   },
46   {
47      { 0.9f, 0.9f, 0.0f, 1.0f },
48      { 0.0f, 0.0f, 1.0f, 1.0f }
49   }
50};
51
52
53
54
55static void set_viewport( float x, float y,
56                          float width, float height,
57                          float near, float far)
58{
59   float z = far;
60   float half_width = (float)width / 2.0f;
61   float half_height = (float)height / 2.0f;
62   float half_depth = ((float)far - (float)near) / 2.0f;
63   struct pipe_viewport_state vp;
64
65   vp.scale[0] = half_width;
66   vp.scale[1] = half_height;
67   vp.scale[2] = half_depth;
68   vp.scale[3] = 1.0f;
69
70   vp.translate[0] = half_width + x;
71   vp.translate[1] = half_height + y;
72   vp.translate[2] = half_depth + z;
73   vp.translate[3] = 0.0f;
74
75   ctx->set_viewport_state( ctx, &vp );
76}
77
78static void set_vertices( void )
79{
80   struct pipe_vertex_element ve[2];
81   struct pipe_vertex_buffer vbuf;
82   void *handle;
83
84   memset(ve, 0, sizeof ve);
85
86   ve[0].src_offset = Offset(struct vertex, position);
87   ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
88   ve[1].src_offset = Offset(struct vertex, color);
89   ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
90
91   handle = ctx->create_vertex_elements_state(ctx, 2, ve);
92   ctx->bind_vertex_elements_state(ctx, handle);
93
94
95   vbuf.stride = sizeof( struct vertex );
96   vbuf.buffer_offset = 0;
97   vbuf.buffer = screen->user_buffer_create(screen,
98                                            vertices,
99                                            sizeof(vertices),
100                                            PIPE_BIND_VERTEX_BUFFER);
101
102   ctx->set_vertex_buffers(ctx, 1, &vbuf);
103}
104
105static void set_vertex_shader( void )
106{
107   void *handle;
108   const char *text =
109      "VERT\n"
110      "DCL IN[0]\n"
111      "DCL IN[1]\n"
112      "DCL OUT[0], POSITION\n"
113      "DCL OUT[1], COLOR\n"
114      "  0: MOV OUT[1], IN[1]\n"
115      "  1: MOV OUT[0], IN[0]\n"
116      "  2: END\n";
117
118   handle = graw_parse_vertex_shader(ctx, text);
119   ctx->bind_vs_state(ctx, handle);
120}
121
122static void set_fragment_shader( void )
123{
124   void *handle;
125   const char *text =
126      "FRAG\n"
127      "DCL IN[0], COLOR, LINEAR\n"
128      "DCL OUT[0], COLOR\n"
129      "  0: MOV OUT[0], IN[0]\n"
130      "  1: END\n";
131
132   handle = graw_parse_fragment_shader(ctx, text);
133   ctx->bind_fs_state(ctx, handle);
134}
135
136
137static void draw( void )
138{
139   float clear_color[4] = {1,0,1,1};
140
141   ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
142   util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
143   ctx->flush(ctx, NULL);
144
145   graw_save_surface_to_file(ctx, surf, NULL);
146
147   screen->flush_frontbuffer(screen, tex, 0, 0, window);
148}
149
150
151static void init( void )
152{
153   struct pipe_framebuffer_state fb;
154   struct pipe_resource templat;
155   struct pipe_surface surf_tmpl;
156   int i;
157
158   /* It's hard to say whether window or screen should be created
159    * first.  Different environments would prefer one or the other.
160    *
161    * Also, no easy way of querying supported formats if the screen
162    * cannot be created first.
163    */
164   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
165      screen = graw_create_window_and_screen(0, 0, 300, 300,
166                                             formats[i],
167                                             &window);
168      if (window && screen)
169         break;
170   }
171   if (!screen || !window) {
172      fprintf(stderr, "Unable to create window\n");
173      exit(1);
174   }
175
176   ctx = screen->context_create(screen, NULL);
177   if (ctx == NULL) {
178      fprintf(stderr, "Unable to create context!\n");
179      exit(3);
180   }
181
182   templat.target = PIPE_TEXTURE_2D;
183   templat.format = formats[i];
184   templat.width0 = WIDTH;
185   templat.height0 = HEIGHT;
186   templat.depth0 = 1;
187   templat.array_size = 1;
188   templat.last_level = 0;
189   templat.nr_samples = 1;
190   templat.bind = (PIPE_BIND_RENDER_TARGET |
191                   PIPE_BIND_DISPLAY_TARGET);
192
193   tex = screen->resource_create(screen,
194                                 &templat);
195   if (tex == NULL) {
196      fprintf(stderr, "Unable to create screen texture!\n");
197      exit(4);
198   }
199
200   surf_tmpl.format = templat.format;
201   surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
202   surf_tmpl.u.tex.level = 0;
203   surf_tmpl.u.tex.first_layer = 0;
204   surf_tmpl.u.tex.last_layer = 0;
205   surf = ctx->create_surface(ctx, tex, &surf_tmpl);
206   if (surf == NULL) {
207      fprintf(stderr, "Unable to create tex surface!\n");
208      exit(5);
209   }
210
211   memset(&fb, 0, sizeof fb);
212   fb.nr_cbufs = 1;
213   fb.width = WIDTH;
214   fb.height = HEIGHT;
215   fb.cbufs[0] = surf;
216
217   ctx->set_framebuffer_state(ctx, &fb);
218
219   {
220      struct pipe_blend_state blend;
221      void *handle;
222      memset(&blend, 0, sizeof blend);
223      blend.rt[0].colormask = PIPE_MASK_RGBA;
224      handle = ctx->create_blend_state(ctx, &blend);
225      ctx->bind_blend_state(ctx, handle);
226   }
227
228   {
229      struct pipe_depth_stencil_alpha_state depthstencil;
230      void *handle;
231      memset(&depthstencil, 0, sizeof depthstencil);
232      handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
233      ctx->bind_depth_stencil_alpha_state(ctx, handle);
234   }
235
236   {
237      struct pipe_rasterizer_state rasterizer;
238      void *handle;
239      memset(&rasterizer, 0, sizeof rasterizer);
240      rasterizer.cull_face = PIPE_FACE_NONE;
241      rasterizer.gl_rasterization_rules = 1;
242      handle = ctx->create_rasterizer_state(ctx, &rasterizer);
243      ctx->bind_rasterizer_state(ctx, handle);
244   }
245
246   set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
247   set_vertices();
248   set_vertex_shader();
249   set_fragment_shader();
250}
251
252static void args(int argc, char *argv[])
253{
254   int i;
255
256   for (i = 1; i < argc;) {
257      if (graw_parse_args(&i, argc, argv)) {
258         continue;
259      }
260      exit(1);
261   }
262}
263
264int main( int argc, char *argv[] )
265{
266   args(argc, argv);
267   init();
268
269   graw_set_display_func( draw );
270   graw_main_loop();
271   return 0;
272}
273