tri-gs.c revision 3464ebd5 
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
15enum pipe_format formats[] = {
16   PIPE_FORMAT_R8G8B8A8_UNORM,
17   PIPE_FORMAT_B8G8R8A8_UNORM,
18   PIPE_FORMAT_NONE
19};
20
21static const int WIDTH = 300;
22static const int HEIGHT = 300;
23
24static struct pipe_screen *screen = NULL;
25static struct pipe_context *ctx = NULL;
26static struct pipe_surface *surf = NULL;
27static struct pipe_resource *tex = NULL;
28static void *window = NULL;
29
30struct vertex {
31   float position[4];
32   float color[4];
33};
34
35static struct vertex vertices[4] =
36{
37   { { 0.0f, -0.9f, 0.0f, 1.0f },
38     { 1.0f, 0.0f, 0.0f, 1.0f }
39   },
40   { { -0.9f, 0.9f, 0.0f, 1.0f },
41     { 0.0f, 1.0f, 0.0f, 1.0f }
42   },
43   { { 0.9f, 0.9f, 0.0f, 1.0f },
44     { 0.0f, 0.0f, 1.0f, 1.0f }
45   }
46};
47
48
49
50
51static void set_viewport( float x, float y,
52                          float width, float height,
53                          float near, float far)
54{
55   float z = far;
56   float half_width = (float)width / 2.0f;
57   float half_height = (float)height / 2.0f;
58   float half_depth = ((float)far - (float)near) / 2.0f;
59   struct pipe_viewport_state vp;
60
61   vp.scale[0] = half_width;
62   vp.scale[1] = half_height;
63   vp.scale[2] = half_depth;
64   vp.scale[3] = 1.0f;
65
66   vp.translate[0] = half_width + x;
67   vp.translate[1] = half_height + y;
68   vp.translate[2] = half_depth + z;
69   vp.translate[3] = 0.0f;
70
71   ctx->set_viewport_state( ctx, &vp );
72}
73
74static void set_vertices( void )
75{
76   struct pipe_vertex_element ve[2];
77   struct pipe_vertex_buffer vbuf;
78   void *handle;
79
80   memset(ve, 0, sizeof ve);
81
82   ve[0].src_offset = Offset(struct vertex, position);
83   ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
84   ve[1].src_offset = Offset(struct vertex, color);
85   ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
86
87   handle = ctx->create_vertex_elements_state(ctx, 2, ve);
88   ctx->bind_vertex_elements_state(ctx, handle);
89
90
91   vbuf.stride = sizeof( struct vertex );
92   vbuf.buffer_offset = 0;
93   vbuf.buffer = screen->user_buffer_create(screen,
94                                            vertices,
95                                            sizeof(vertices),
96                                            PIPE_BIND_VERTEX_BUFFER);
97
98   ctx->set_vertex_buffers(ctx, 1, &vbuf);
99}
100
101static void set_vertex_shader( void )
102{
103   void *handle;
104   const char *text =
105      "VERT\n"
106      "DCL IN[0]\n"
107      "DCL IN[1]\n"
108      "DCL OUT[0], POSITION\n"
109      "DCL OUT[1], COLOR\n"
110      "  0: MOV OUT[1], IN[1]\n"
111      "  1: MOV OUT[0], IN[0]\n"
112      "  2: END\n";
113
114   handle = graw_parse_vertex_shader(ctx, text);
115   ctx->bind_vs_state(ctx, handle);
116}
117
118static void set_fragment_shader( void )
119{
120   void *handle;
121   const char *text =
122      "FRAG\n"
123      "DCL IN[0], COLOR, LINEAR\n"
124      "DCL OUT[0], COLOR\n"
125      "  0: MOV OUT[0], IN[0]\n"
126      "  1: END\n";
127
128   handle = graw_parse_fragment_shader(ctx, text);
129   ctx->bind_fs_state(ctx, handle);
130}
131
132
133static void set_geometry_shader( void )
134{
135   void *handle;
136   const char *text =
137      "GEOM\n"
138      "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
139      "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
140      "DCL IN[][0], POSITION, CONSTANT\n"
141      "DCL IN[][1], COLOR, CONSTANT\n"
142      "DCL OUT[0], POSITION, CONSTANT\n"
143      "DCL OUT[1], COLOR, CONSTANT\n"
144      "0:MOV OUT[0], IN[0][0]\n"
145      "1:MOV OUT[1], IN[0][1]\n"
146      "2:EMIT\n"
147      "3:MOV OUT[0], IN[1][0]\n"
148      "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
149      "5:EMIT\n"
150      "6:MOV OUT[0], IN[2][0]\n"
151      "7:MOV OUT[1], IN[2][1]\n"
152      "8:EMIT\n"
153      "9:ENDPRIM\n"
154      "10:END\n";
155
156   handle = graw_parse_geometry_shader(ctx, text);
157   ctx->bind_gs_state(ctx, handle);
158}
159
160static void draw( void )
161{
162   float clear_color[4] = {1,0,1,1};
163
164   ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
165   util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
166   ctx->flush(ctx, NULL);
167
168   screen->flush_frontbuffer(screen, tex, 0, 0, window);
169}
170
171
172static void init( void )
173{
174   struct pipe_framebuffer_state fb;
175   struct pipe_resource templat;
176   struct pipe_surface surf_tmpl;
177   int i;
178
179   /* It's hard to say whether window or screen should be created
180    * first.  Different environments would prefer one or the other.
181    *
182    * Also, no easy way of querying supported formats if the screen
183    * cannot be created first.
184    */
185   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
186      screen = graw_create_window_and_screen(0, 0, 300, 300,
187                                             formats[i],
188                                             &window);
189      if (window && screen)
190         break;
191   }
192   if (!screen || !window) {
193      fprintf(stderr, "Unable to create window\n");
194      exit(1);
195   }
196
197   ctx = screen->context_create(screen, NULL);
198   if (ctx == NULL)
199      exit(3);
200
201   templat.target = PIPE_TEXTURE_2D;
202   templat.format = formats[i];
203   templat.width0 = WIDTH;
204   templat.height0 = HEIGHT;
205   templat.depth0 = 1;
206   templat.array_size = 1;
207   templat.last_level = 0;
208   templat.nr_samples = 1;
209   templat.bind = (PIPE_BIND_RENDER_TARGET |
210                   PIPE_BIND_DISPLAY_TARGET);
211
212   tex = screen->resource_create(screen,
213                                 &templat);
214   if (tex == NULL)
215      exit(4);
216
217   surf_tmpl.format = templat.format;
218   surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
219   surf_tmpl.u.tex.level = 0;
220   surf_tmpl.u.tex.first_layer = 0;
221   surf_tmpl.u.tex.last_layer = 0;
222   surf = ctx->create_surface(ctx, tex, &surf_tmpl);
223   if (surf == NULL)
224      exit(5);
225
226   memset(&fb, 0, sizeof fb);
227   fb.nr_cbufs = 1;
228   fb.width = WIDTH;
229   fb.height = HEIGHT;
230   fb.cbufs[0] = surf;
231
232   ctx->set_framebuffer_state(ctx, &fb);
233
234   {
235      struct pipe_blend_state blend;
236      void *handle;
237      memset(&blend, 0, sizeof blend);
238      blend.rt[0].colormask = PIPE_MASK_RGBA;
239      handle = ctx->create_blend_state(ctx, &blend);
240      ctx->bind_blend_state(ctx, handle);
241   }
242
243   {
244      struct pipe_depth_stencil_alpha_state depthstencil;
245      void *handle;
246      memset(&depthstencil, 0, sizeof depthstencil);
247      handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
248      ctx->bind_depth_stencil_alpha_state(ctx, handle);
249   }
250
251   {
252      struct pipe_rasterizer_state rasterizer;
253      void *handle;
254      memset(&rasterizer, 0, sizeof rasterizer);
255      rasterizer.cull_face = PIPE_FACE_NONE;
256      rasterizer.gl_rasterization_rules = 1;
257      handle = ctx->create_rasterizer_state(ctx, &rasterizer);
258      ctx->bind_rasterizer_state(ctx, handle);
259   }
260
261   set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
262   set_vertices();
263   set_vertex_shader();
264   set_fragment_shader();
265   set_geometry_shader();
266}
267
268
269int main( int argc, char *argv[] )
270{
271   init();
272
273   graw_set_display_func( draw );
274   graw_main_loop();
275   return 0;
276}
277