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_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[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_state( ctx, &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
92   vbuf.stride = sizeof( struct vertex );
93   vbuf.buffer_offset = 0;
94   vbuf.buffer = pipe_buffer_create_with_data(ctx,
95                                              PIPE_BIND_VERTEX_BUFFER,
96                                              PIPE_USAGE_STATIC,
97                                              sizeof(vertices),
98                                              vertices);
99
100   ctx->set_vertex_buffers(ctx, 1, &vbuf);
101}
102
103static void set_vertex_shader( void )
104{
105   void *handle;
106   const char *text =
107      "VERT\n"
108      "DCL IN[0]\n"
109      "DCL IN[1]\n"
110      "DCL OUT[0], POSITION\n"
111      "DCL OUT[1], COLOR\n"
112      "  0: MOV OUT[1], IN[1]\n"
113      "  1: MOV OUT[0], IN[0]\n"
114      "  2: END\n";
115
116   handle = graw_parse_vertex_shader(ctx, text);
117   ctx->bind_vs_state(ctx, handle);
118}
119
120static void set_fragment_shader( void )
121{
122   void *handle;
123   const char *text =
124      "FRAG\n"
125      "DCL IN[0], COLOR, LINEAR\n"
126      "DCL OUT[0], COLOR\n"
127      "  0: MOV OUT[0], IN[0]\n"
128      "  1: END\n";
129
130   handle = graw_parse_fragment_shader(ctx, text);
131   ctx->bind_fs_state(ctx, handle);
132}
133
134
135static void set_geometry_shader( void )
136{
137   void *handle;
138   const char *text =
139      "GEOM\n"
140      "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
141      "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
142      "DCL IN[][0], POSITION, CONSTANT\n"
143      "DCL IN[][1], COLOR, CONSTANT\n"
144      "DCL OUT[0], POSITION, CONSTANT\n"
145      "DCL OUT[1], COLOR, CONSTANT\n"
146      "0:MOV OUT[0], IN[0][0]\n"
147      "1:MOV OUT[1], IN[0][1]\n"
148      "2:EMIT\n"
149      "3:MOV OUT[0], IN[1][0]\n"
150      "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
151      "5:EMIT\n"
152      "6:MOV OUT[0], IN[2][0]\n"
153      "7:MOV OUT[1], IN[2][1]\n"
154      "8:EMIT\n"
155      "9:ENDPRIM\n"
156      "10:END\n";
157
158   handle = graw_parse_geometry_shader(ctx, text);
159   ctx->bind_gs_state(ctx, handle);
160}
161
162static void draw( void )
163{
164   union pipe_color_union clear_color = { {1,0,1,1} };
165
166   ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
167   util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
168   ctx->flush(ctx, NULL);
169
170   screen->flush_frontbuffer(screen, tex, 0, 0, window);
171}
172
173
174static void init( void )
175{
176   struct pipe_framebuffer_state fb;
177   struct pipe_resource templat;
178   struct pipe_surface surf_tmpl;
179   int i;
180
181   /* It's hard to say whether window or screen should be created
182    * first.  Different environments would prefer one or the other.
183    *
184    * Also, no easy way of querying supported formats if the screen
185    * cannot be created first.
186    */
187   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
188      screen = graw_create_window_and_screen(0, 0, 300, 300,
189                                             formats[i],
190                                             &window);
191      if (window && screen)
192         break;
193   }
194   if (!screen || !window) {
195      fprintf(stderr, "Unable to create window\n");
196      exit(1);
197   }
198
199   ctx = screen->context_create(screen, NULL);
200   if (ctx == NULL)
201      exit(3);
202
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.usage = PIPE_BIND_RENDER_TARGET;
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.gl_rasterization_rules = 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