1/**************************************************************************
2 *
3 * Copyright © 2010 Jakob Bornecrantz
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 **************************************************************************/
25
26
27#define USE_TRACE 0
28#define WIDTH 300
29#define HEIGHT 300
30#define NEAR 30
31#define FAR 1000
32#define FLIP 0
33
34/* pipe_*_state structs */
35#include "pipe/p_state.h"
36/* pipe_context */
37#include "pipe/p_context.h"
38/* pipe_screen */
39#include "pipe/p_screen.h"
40/* PIPE_* */
41#include "pipe/p_defines.h"
42/* TGSI_SEMANTIC_{POSITION|GENERIC} */
43#include "pipe/p_shader_tokens.h"
44/* pipe_buffer_* helpers */
45#include "util/u_inlines.h"
46
47/* constant state object helper */
48#include "cso_cache/cso_context.h"
49
50/* debug_dump_surface_bmp */
51#include "util/u_debug.h"
52/* util_draw_vertex_buffer helper */
53#include "util/u_draw_quad.h"
54/* FREE & CALLOC_STRUCT */
55#include "util/u_memory.h"
56/* util_make_[fragment|vertex]_passthrough_shader */
57#include "util/u_simple_shaders.h"
58/* to get a hardware pipe driver */
59#include "pipe-loader/pipe_loader.h"
60
61struct program
62{
63	struct pipe_loader_device *dev;
64	struct pipe_screen *screen;
65	struct pipe_context *pipe;
66	struct cso_context *cso;
67
68	struct pipe_blend_state blend;
69	struct pipe_depth_stencil_alpha_state depthstencil;
70	struct pipe_rasterizer_state rasterizer;
71	struct pipe_viewport_state viewport;
72	struct pipe_framebuffer_state framebuffer;
73	struct pipe_vertex_element velem[2];
74
75	void *vs;
76	void *fs;
77
78	union pipe_color_union clear_color;
79
80	struct pipe_resource *vbuf;
81	struct pipe_resource *target;
82};
83
84static void init_prog(struct program *p)
85{
86	struct pipe_surface surf_tmpl;
87	int ret;
88
89	/* find a hardware device */
90	ret = pipe_loader_probe(&p->dev, 1);
91	assert(ret);
92
93	/* init a pipe screen */
94	p->screen = pipe_loader_create_screen(p->dev, PIPE_SEARCH_DIR);
95	assert(p->screen);
96
97	/* create the pipe driver context and cso context */
98	p->pipe = p->screen->context_create(p->screen, NULL);
99	p->cso = cso_create_context(p->pipe);
100
101	/* set clear color */
102	p->clear_color.f[0] = 0.3;
103	p->clear_color.f[1] = 0.1;
104	p->clear_color.f[2] = 0.3;
105	p->clear_color.f[3] = 1.0;
106
107	/* vertex buffer */
108	{
109		float vertices[4][2][4] = {
110			{
111				{ 0.0f, -0.9f, 0.0f, 1.0f },
112				{ 1.0f, 0.0f, 0.0f, 1.0f }
113			},
114			{
115				{ -0.9f, 0.9f, 0.0f, 1.0f },
116				{ 0.0f, 1.0f, 0.0f, 1.0f }
117			},
118			{
119				{ 0.9f, 0.9f, 0.0f, 1.0f },
120				{ 0.0f, 0.0f, 1.0f, 1.0f }
121			}
122		};
123
124		p->vbuf = pipe_buffer_create(p->screen, PIPE_BIND_VERTEX_BUFFER,
125					     PIPE_USAGE_STATIC, sizeof(vertices));
126		pipe_buffer_write(p->pipe, p->vbuf, 0, sizeof(vertices), vertices);
127	}
128
129	/* render target texture */
130	{
131		struct pipe_resource tmplt;
132		memset(&tmplt, 0, sizeof(tmplt));
133		tmplt.target = PIPE_TEXTURE_2D;
134		tmplt.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
135		tmplt.width0 = WIDTH;
136		tmplt.height0 = HEIGHT;
137		tmplt.depth0 = 1;
138		tmplt.array_size = 1;
139		tmplt.last_level = 0;
140		tmplt.bind = PIPE_BIND_RENDER_TARGET;
141
142		p->target = p->screen->resource_create(p->screen, &tmplt);
143	}
144
145	/* disabled blending/masking */
146	memset(&p->blend, 0, sizeof(p->blend));
147	p->blend.rt[0].colormask = PIPE_MASK_RGBA;
148
149	/* no-op depth/stencil/alpha */
150	memset(&p->depthstencil, 0, sizeof(p->depthstencil));
151
152	/* rasterizer */
153	memset(&p->rasterizer, 0, sizeof(p->rasterizer));
154	p->rasterizer.cull_face = PIPE_FACE_NONE;
155	p->rasterizer.gl_rasterization_rules = 1;
156	p->rasterizer.depth_clip = 1;
157
158	surf_tmpl.format = PIPE_FORMAT_B8G8R8A8_UNORM;
159	surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
160	surf_tmpl.u.tex.level = 0;
161	surf_tmpl.u.tex.first_layer = 0;
162	surf_tmpl.u.tex.last_layer = 0;
163	/* drawing destination */
164	memset(&p->framebuffer, 0, sizeof(p->framebuffer));
165	p->framebuffer.width = WIDTH;
166	p->framebuffer.height = HEIGHT;
167	p->framebuffer.nr_cbufs = 1;
168	p->framebuffer.cbufs[0] = p->pipe->create_surface(p->pipe, p->target, &surf_tmpl);
169
170	/* viewport, depth isn't really needed */
171	{
172		float x = 0;
173		float y = 0;
174		float z = FAR;
175		float half_width = (float)WIDTH / 2.0f;
176		float half_height = (float)HEIGHT / 2.0f;
177		float half_depth = ((float)FAR - (float)NEAR) / 2.0f;
178		float scale, bias;
179
180		if (FLIP) {
181			scale = -1.0f;
182			bias = (float)HEIGHT;
183		} else {
184			scale = 1.0f;
185			bias = 0.0f;
186		}
187
188		p->viewport.scale[0] = half_width;
189		p->viewport.scale[1] = half_height * scale;
190		p->viewport.scale[2] = half_depth;
191		p->viewport.scale[3] = 1.0f;
192
193		p->viewport.translate[0] = half_width + x;
194		p->viewport.translate[1] = (half_height + y) * scale + bias;
195		p->viewport.translate[2] = half_depth + z;
196		p->viewport.translate[3] = 0.0f;
197	}
198
199	/* vertex elements state */
200	memset(p->velem, 0, sizeof(p->velem));
201	p->velem[0].src_offset = 0 * 4 * sizeof(float); /* offset 0, first element */
202	p->velem[0].instance_divisor = 0;
203	p->velem[0].vertex_buffer_index = 0;
204	p->velem[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
205
206	p->velem[1].src_offset = 1 * 4 * sizeof(float); /* offset 16, second element */
207	p->velem[1].instance_divisor = 0;
208	p->velem[1].vertex_buffer_index = 0;
209	p->velem[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
210
211	/* vertex shader */
212	{
213			const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
214							TGSI_SEMANTIC_COLOR };
215			const uint semantic_indexes[] = { 0, 0 };
216			p->vs = util_make_vertex_passthrough_shader(p->pipe, 2, semantic_names, semantic_indexes);
217	}
218
219	/* fragment shader */
220	p->fs = util_make_fragment_passthrough_shader(p->pipe);
221}
222
223static void close_prog(struct program *p)
224{
225	/* unset all state */
226	cso_release_all(p->cso);
227
228	p->pipe->delete_vs_state(p->pipe, p->vs);
229	p->pipe->delete_fs_state(p->pipe, p->fs);
230
231	pipe_surface_reference(&p->framebuffer.cbufs[0], NULL);
232	pipe_resource_reference(&p->target, NULL);
233	pipe_resource_reference(&p->vbuf, NULL);
234
235	cso_destroy_context(p->cso);
236	p->pipe->destroy(p->pipe);
237	p->screen->destroy(p->screen);
238	pipe_loader_release(&p->dev, 1);
239
240	FREE(p);
241}
242
243static void draw(struct program *p)
244{
245	/* set the render target */
246	cso_set_framebuffer(p->cso, &p->framebuffer);
247
248	/* clear the render target */
249	p->pipe->clear(p->pipe, PIPE_CLEAR_COLOR, &p->clear_color, 0, 0);
250
251	/* set misc state we care about */
252	cso_set_blend(p->cso, &p->blend);
253	cso_set_depth_stencil_alpha(p->cso, &p->depthstencil);
254	cso_set_rasterizer(p->cso, &p->rasterizer);
255	cso_set_viewport(p->cso, &p->viewport);
256
257	/* shaders */
258	cso_set_fragment_shader_handle(p->cso, p->fs);
259	cso_set_vertex_shader_handle(p->cso, p->vs);
260
261	/* vertex element data */
262	cso_set_vertex_elements(p->cso, 2, p->velem);
263
264	util_draw_vertex_buffer(p->pipe, p->cso,
265	                        p->vbuf, 0,
266	                        PIPE_PRIM_TRIANGLES,
267	                        3,  /* verts */
268	                        2); /* attribs/vert */
269
270        p->pipe->flush(p->pipe, NULL);
271
272	debug_dump_surface_bmp(p->pipe, "result.bmp", p->framebuffer.cbufs[0]);
273}
274
275int main(int argc, char** argv)
276{
277	struct program *p = CALLOC_STRUCT(program);
278
279	init_prog(p);
280	draw(p);
281	close_prog(p);
282
283	return 0;
284}
285