tri-gs.c revision af69d88d 
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#include "state_tracker/graw.h"
7#include "pipe/p_screen.h"
8#include "pipe/p_context.h"
9#include "pipe/p_state.h"
10#include "pipe/p_defines.h"
11
12#include "util/u_memory.h"      /* Offset() */
13#include "util/u_draw_quad.h"
14#include "util/u_inlines.h"
15
16enum pipe_format formats[] = {
17   PIPE_FORMAT_RGBA8888_UNORM,
18   PIPE_FORMAT_BGRA8888_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[4] =
37{
38   { { 0.0f, -0.9f, 0.0f, 1.0f },
39     { 1.0f, 0.0f, 0.0f, 1.0f }
40   },
41   { { -0.9f, 0.9f, 0.0f, 1.0f },
42     { 0.0f, 1.0f, 0.0f, 1.0f }
43   },
44   { { 0.9f, 0.9f, 0.0f, 1.0f },
45     { 0.0f, 0.0f, 1.0f, 1.0f }
46   }
47};
48
49
50
51
52static void set_viewport( float x, float y,
53                          float width, float height,
54                          float near, float far)
55{
56   float z = far;
57   float half_width = (float)width / 2.0f;
58   float half_height = (float)height / 2.0f;
59   float half_depth = ((float)far - (float)near) / 2.0f;
60   struct pipe_viewport_state vp;
61
62   vp.scale[0] = half_width;
63   vp.scale[1] = half_height;
64   vp.scale[2] = half_depth;
65   vp.scale[3] = 1.0f;
66
67   vp.translate[0] = half_width + x;
68   vp.translate[1] = half_height + y;
69   vp.translate[2] = half_depth + z;
70   vp.translate[3] = 0.0f;
71
72   ctx->set_viewport_states( ctx, 0, 1, &vp );
73}
74
75static void set_vertices( void )
76{
77   struct pipe_vertex_element ve[2];
78   struct pipe_vertex_buffer vbuf;
79   void *handle;
80
81   memset(ve, 0, sizeof ve);
82
83   ve[0].src_offset = Offset(struct vertex, position);
84   ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
85   ve[1].src_offset = Offset(struct vertex, color);
86   ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
87
88   handle = ctx->create_vertex_elements_state(ctx, 2, ve);
89   ctx->bind_vertex_elements_state(ctx, handle);
90
91   memset(&vbuf, 0, sizeof vbuf);
92
93   vbuf.stride = sizeof( struct vertex );
94   vbuf.buffer_offset = 0;
95   vbuf.buffer = pipe_buffer_create_with_data(ctx,
96                                              PIPE_BIND_VERTEX_BUFFER,
97                                              PIPE_USAGE_DEFAULT,
98                                              sizeof(vertices),
99                                              vertices);
100
101   ctx->set_vertex_buffers(ctx, 0, 1, &vbuf);
102}
103
104static void set_vertex_shader( void )
105{
106   void *handle;
107   const char *text =
108      "VERT\n"
109      "DCL IN[0]\n"
110      "DCL IN[1]\n"
111      "DCL OUT[0], POSITION\n"
112      "DCL OUT[1], COLOR\n"
113      "  0: MOV OUT[1], IN[1]\n"
114      "  1: MOV OUT[0], IN[0]\n"
115      "  2: END\n";
116
117   handle = graw_parse_vertex_shader(ctx, text);
118   ctx->bind_vs_state(ctx, handle);
119}
120
121static void set_fragment_shader( void )
122{
123   void *handle;
124   const char *text =
125      "FRAG\n"
126      "DCL IN[0], COLOR, LINEAR\n"
127      "DCL OUT[0], COLOR\n"
128      "  0: MOV OUT[0], IN[0]\n"
129      "  1: END\n";
130
131   handle = graw_parse_fragment_shader(ctx, text);
132   ctx->bind_fs_state(ctx, handle);
133}
134
135
136static void set_geometry_shader( void )
137{
138   void *handle;
139   const char *text =
140      "GEOM\n"
141      "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
142      "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
143      "DCL IN[][0], POSITION, CONSTANT\n"
144      "DCL IN[][1], COLOR, CONSTANT\n"
145      "DCL OUT[0], POSITION, CONSTANT\n"
146      "DCL OUT[1], COLOR, CONSTANT\n"
147      "0:MOV OUT[0], IN[0][0]\n"
148      "1:MOV OUT[1], IN[0][1]\n"
149      "2:EMIT\n"
150      "3:MOV OUT[0], IN[1][0]\n"
151      "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
152      "5:EMIT\n"
153      "6:MOV OUT[0], IN[2][0]\n"
154      "7:MOV OUT[1], IN[2][1]\n"
155      "8:EMIT\n"
156      "9:ENDPRIM\n"
157      "10:END\n";
158
159   handle = graw_parse_geometry_shader(ctx, text);
160   ctx->bind_gs_state(ctx, handle);
161}
162
163static void draw( void )
164{
165   union pipe_color_union clear_color = { {1,0,1,1} };
166
167   ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
168   util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
169   ctx->flush(ctx, NULL, 0);
170
171   screen->flush_frontbuffer(screen, tex, 0, 0, window, NULL);
172}
173
174
175static void init( void )
176{
177   struct pipe_framebuffer_state fb;
178   struct pipe_resource templat;
179   struct pipe_surface surf_tmpl;
180   int i;
181
182   /* It's hard to say whether window or screen should be created
183    * first.  Different environments would prefer one or the other.
184    *
185    * Also, no easy way of querying supported formats if the screen
186    * cannot be created first.
187    */
188   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
189      screen = graw_create_window_and_screen(0, 0, 300, 300,
190                                             formats[i],
191                                             &window);
192      if (window && screen)
193         break;
194   }
195   if (!screen || !window) {
196      fprintf(stderr, "Unable to create window\n");
197      exit(1);
198   }
199
200   ctx = screen->context_create(screen, NULL);
201   if (ctx == NULL)
202      exit(3);
203
204   templat.target = PIPE_TEXTURE_2D;
205   templat.format = formats[i];
206   templat.width0 = WIDTH;
207   templat.height0 = HEIGHT;
208   templat.depth0 = 1;
209   templat.array_size = 1;
210   templat.last_level = 0;
211   templat.nr_samples = 1;
212   templat.bind = (PIPE_BIND_RENDER_TARGET |
213                   PIPE_BIND_DISPLAY_TARGET);
214
215   tex = screen->resource_create(screen,
216                                 &templat);
217   if (tex == NULL)
218      exit(4);
219
220   surf_tmpl.format = templat.format;
221   surf_tmpl.u.tex.level = 0;
222   surf_tmpl.u.tex.first_layer = 0;
223   surf_tmpl.u.tex.last_layer = 0;
224   surf = ctx->create_surface(ctx, tex, &surf_tmpl);
225   if (surf == NULL)
226      exit(5);
227
228   memset(&fb, 0, sizeof fb);
229   fb.nr_cbufs = 1;
230   fb.width = WIDTH;
231   fb.height = HEIGHT;
232   fb.cbufs[0] = surf;
233
234   ctx->set_framebuffer_state(ctx, &fb);
235
236   {
237      struct pipe_blend_state blend;
238      void *handle;
239      memset(&blend, 0, sizeof blend);
240      blend.rt[0].colormask = PIPE_MASK_RGBA;
241      handle = ctx->create_blend_state(ctx, &blend);
242      ctx->bind_blend_state(ctx, handle);
243   }
244
245   {
246      struct pipe_depth_stencil_alpha_state depthstencil;
247      void *handle;
248      memset(&depthstencil, 0, sizeof depthstencil);
249      handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
250      ctx->bind_depth_stencil_alpha_state(ctx, handle);
251   }
252
253   {
254      struct pipe_rasterizer_state rasterizer;
255      void *handle;
256      memset(&rasterizer, 0, sizeof rasterizer);
257      rasterizer.cull_face = PIPE_FACE_NONE;
258      rasterizer.half_pixel_center = 1;
259      rasterizer.bottom_edge_rule = 1;
260      rasterizer.depth_clip = 1;
261      handle = ctx->create_rasterizer_state(ctx, &rasterizer);
262      ctx->bind_rasterizer_state(ctx, handle);
263   }
264
265   set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
266   set_vertices();
267   set_vertex_shader();
268   set_fragment_shader();
269   set_geometry_shader();
270}
271
272
273int main( int argc, char *argv[] )
274{
275   init();
276
277   graw_set_display_func( draw );
278   graw_main_loop();
279   return 0;
280}
281