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