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 "frontend/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   vp.swizzle_x = PIPE_VIEWPORT_SWIZZLE_POSITIVE_X;
71   vp.swizzle_y = PIPE_VIEWPORT_SWIZZLE_POSITIVE_Y;
72   vp.swizzle_z = PIPE_VIEWPORT_SWIZZLE_POSITIVE_Z;
73   vp.swizzle_w = PIPE_VIEWPORT_SWIZZLE_POSITIVE_W;
74
75   ctx->set_viewport_states( ctx, 0, 1, &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   memset(&vbuf, 0, sizeof vbuf);
95
96   vbuf.stride = sizeof( struct vertex );
97   vbuf.buffer_offset = 0;
98   vbuf.buffer.resource = pipe_buffer_create_with_data(ctx,
99                                              PIPE_BIND_VERTEX_BUFFER,
100                                              PIPE_USAGE_DEFAULT,
101                                              sizeof(vertices),
102                                              vertices);
103
104   ctx->set_vertex_buffers(ctx, 0, 1, 0, false, &vbuf);
105}
106
107static void set_vertex_shader( void )
108{
109   void *handle;
110   const char *text =
111      "VERT\n"
112      "DCL IN[0]\n"
113      "DCL IN[1]\n"
114      "DCL OUT[0], POSITION\n"
115      "DCL OUT[1], COLOR\n"
116      "  0: MOV OUT[1], IN[1]\n"
117      "  1: MOV OUT[0], IN[0]\n"
118      "  2: END\n";
119
120   handle = graw_parse_vertex_shader(ctx, text);
121   ctx->bind_vs_state(ctx, handle);
122}
123
124static void set_fragment_shader( void )
125{
126   void *handle;
127   const char *text =
128      "FRAG\n"
129      "DCL IN[0], COLOR, LINEAR\n"
130      "DCL OUT[0], COLOR\n"
131      "  0: MOV OUT[0], IN[0]\n"
132      "  1: END\n";
133
134   handle = graw_parse_fragment_shader(ctx, text);
135   ctx->bind_fs_state(ctx, handle);
136}
137
138
139static void set_geometry_shader( void )
140{
141   void *handle;
142   const char *text =
143      "GEOM\n"
144      "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
145      "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
146      "DCL IN[][0], POSITION, CONSTANT\n"
147      "DCL IN[][1], COLOR, CONSTANT\n"
148      "DCL OUT[0], POSITION, CONSTANT\n"
149      "DCL OUT[1], COLOR, CONSTANT\n"
150      "0:MOV OUT[0], IN[0][0]\n"
151      "1:MOV OUT[1], IN[0][1]\n"
152      "2:EMIT\n"
153      "3:MOV OUT[0], IN[1][0]\n"
154      "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
155      "5:EMIT\n"
156      "6:MOV OUT[0], IN[2][0]\n"
157      "7:MOV OUT[1], IN[2][1]\n"
158      "8:EMIT\n"
159      "9:ENDPRIM\n"
160      "10:END\n";
161
162   handle = graw_parse_geometry_shader(ctx, text);
163   ctx->bind_gs_state(ctx, handle);
164}
165
166static void draw( void )
167{
168   union pipe_color_union clear_color = { {1,0,1,1} };
169
170   ctx->clear(ctx, PIPE_CLEAR_COLOR, NULL, &clear_color, 0, 0);
171   util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
172   ctx->flush(ctx, NULL, 0);
173
174   screen->flush_frontbuffer(screen, ctx, tex, 0, 0, window, NULL);
175}
176
177
178static void init( void )
179{
180   struct pipe_framebuffer_state fb;
181   struct pipe_resource templat;
182   struct pipe_surface surf_tmpl;
183   int i;
184
185   /* It's hard to say whether window or screen should be created
186    * first.  Different environments would prefer one or the other.
187    *
188    * Also, no easy way of querying supported formats if the screen
189    * cannot be created first.
190    */
191   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
192      screen = graw_create_window_and_screen(0, 0, 300, 300,
193                                             formats[i],
194                                             &window);
195      if (window && screen)
196         break;
197   }
198   if (!screen || !window) {
199      fprintf(stderr, "Unable to create window\n");
200      exit(1);
201   }
202
203   ctx = screen->context_create(screen, NULL, 0);
204   if (ctx == NULL)
205      exit(3);
206
207   memset(&templat, 0, sizeof(templat));
208   templat.target = PIPE_TEXTURE_2D;
209   templat.format = formats[i];
210   templat.width0 = WIDTH;
211   templat.height0 = HEIGHT;
212   templat.depth0 = 1;
213   templat.array_size = 1;
214   templat.last_level = 0;
215   templat.bind = (PIPE_BIND_RENDER_TARGET |
216                   PIPE_BIND_DISPLAY_TARGET);
217
218   tex = screen->resource_create(screen,
219                                 &templat);
220   if (tex == NULL)
221      exit(4);
222
223   surf_tmpl.format = templat.format;
224   surf_tmpl.u.tex.level = 0;
225   surf_tmpl.u.tex.first_layer = 0;
226   surf_tmpl.u.tex.last_layer = 0;
227   surf = ctx->create_surface(ctx, tex, &surf_tmpl);
228   if (surf == NULL)
229      exit(5);
230
231   memset(&fb, 0, sizeof fb);
232   fb.nr_cbufs = 1;
233   fb.width = WIDTH;
234   fb.height = HEIGHT;
235   fb.cbufs[0] = surf;
236
237   ctx->set_framebuffer_state(ctx, &fb);
238
239   {
240      struct pipe_blend_state blend;
241      void *handle;
242      memset(&blend, 0, sizeof blend);
243      blend.rt[0].colormask = PIPE_MASK_RGBA;
244      handle = ctx->create_blend_state(ctx, &blend);
245      ctx->bind_blend_state(ctx, handle);
246   }
247
248   {
249      struct pipe_depth_stencil_alpha_state depthstencil;
250      void *handle;
251      memset(&depthstencil, 0, sizeof depthstencil);
252      handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
253      ctx->bind_depth_stencil_alpha_state(ctx, handle);
254   }
255
256   {
257      struct pipe_rasterizer_state rasterizer;
258      void *handle;
259      memset(&rasterizer, 0, sizeof rasterizer);
260      rasterizer.cull_face = PIPE_FACE_NONE;
261      rasterizer.half_pixel_center = 1;
262      rasterizer.bottom_edge_rule = 1;
263      rasterizer.depth_clip_near = 1;
264      rasterizer.depth_clip_far = 1;
265      handle = ctx->create_rasterizer_state(ctx, &rasterizer);
266      ctx->bind_rasterizer_state(ctx, handle);
267   }
268
269   set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
270   set_vertices();
271   set_vertex_shader();
272   set_fragment_shader();
273   set_geometry_shader();
274}
275
276
277int main( int argc, char *argv[] )
278{
279   init();
280
281   graw_set_display_func( draw );
282   graw_main_loop();
283   return 0;
284}
285