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
16 enum pipe_format formats[] = {
17 PIPE_FORMAT_RGBA8888_UNORM,
18 PIPE_FORMAT_BGRA8888_UNORM,
19 PIPE_FORMAT_NONE
20 };
21
22 static const int WIDTH = 300;
23 static const int HEIGHT = 300;
24
25 static struct pipe_screen *screen = NULL;
26 static struct pipe_context *ctx = NULL;
27 static struct pipe_surface *surf = NULL;
28 static struct pipe_resource *tex = NULL;
29 static void *window = NULL;
30
31 struct vertex {
32 float position[4];
33 float color[4];
34 };
35
36 static 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
set_viewport(float x,float y,float width,float height,float zNear,float zFar)52 static 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
set_vertices(void)73 static 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.resource = 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
set_vertex_shader(void)102 static 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
set_fragment_shader(void)119 static 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
set_geometry_shader(void)134 static 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
draw(void)161 static void draw( void )
162 {
163 union pipe_color_union clear_color = { {1,0,1,1} };
164
165 ctx->clear(ctx, PIPE_CLEAR_COLOR, NULL, &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
init(void)173 static 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.bind = (PIPE_BIND_RENDER_TARGET |
211 PIPE_BIND_DISPLAY_TARGET);
212
213 tex = screen->resource_create(screen,
214 &templat);
215 if (tex == NULL)
216 exit(4);
217
218 surf_tmpl.format = templat.format;
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.half_pixel_center = 1;
257 rasterizer.bottom_edge_rule = 1;
258 rasterizer.depth_clip_near = 1;
259 rasterizer.depth_clip_far = 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
main(int argc,char * argv[])272 int main( int argc, char *argv[] )
273 {
274 init();
275
276 graw_set_display_func( draw );
277 graw_main_loop();
278 return 0;
279 }
280