src/gallium/tests/trivial/quad-tex.c - platform/external/mesa3d - Git at Google

 /**************************************************************************
  *
  * Copyright © 2010 Jakob Bornecrantz
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  *
  **************************************************************************/


 #define USE_TRACE 0
 #define WIDTH 300
 #define HEIGHT 300
 #define NEAR 30
 #define FAR 1000
 #define FLIP 0

 /* pipe_*_state structs */
 #include "pipe/p_state.h"
 /* pipe_context */
 #include "pipe/p_context.h"
 /* pipe_screen */
 #include "pipe/p_screen.h"
 /* PIPE_* */
 #include "pipe/p_defines.h"
 /* TGSI_SEMANTIC_{POSITION|GENERIC} */
 #include "pipe/p_shader_tokens.h"
 /* pipe_buffer_* helpers */
 #include "util/u_inlines.h"

 /* constant state object helper */
 #include "cso_cache/cso_context.h"

 /* u_sampler_view_default_template */
 #include "util/u_sampler.h"
 /* debug_dump_surface_bmp */
 #include "util/u_debug.h"
 /* util_draw_vertex_buffer helper */
 #include "util/u_draw_quad.h"
 /* FREE & CALLOC_STRUCT */
 #include "util/u_memory.h"
 /* util_make_[fragment|vertex]_passthrough_shader */
 #include "util/u_simple_shaders.h"
 /* to get a hardware pipe driver */
 #include "pipe-loader/pipe_loader.h"

 struct program
 {
 	struct pipe_loader_device *dev;
 	struct pipe_screen *screen;
 	struct pipe_context *pipe;
 	struct cso_context *cso;

 	struct pipe_blend_state blend;
 	struct pipe_depth_stencil_alpha_state depthstencil;
 	struct pipe_rasterizer_state rasterizer;
 	struct pipe_sampler_state sampler;
 	struct pipe_viewport_state viewport;
 	struct pipe_framebuffer_state framebuffer;
 	struct pipe_vertex_element velem[2];

 	void *vs;
 	void *fs;

 	union pipe_color_union clear_color;

 	struct pipe_resource *vbuf;
 	struct pipe_resource *target;
 	struct pipe_resource *tex;
 	struct pipe_sampler_view *view;
 };

 static void init_prog(struct program *p)
 {
 	struct pipe_surface surf_tmpl;
 	int ret;

 	/* find a hardware device */
 	ret = pipe_loader_probe(&p->dev, 1);
 	assert(ret);

 	/* init a pipe screen */
 	p->screen = pipe_loader_create_screen(p->dev, PIPE_SEARCH_DIR);
 	assert(p->screen);

 	/* create the pipe driver context and cso context */
 	p->pipe = p->screen->context_create(p->screen, NULL);
 	p->cso = cso_create_context(p->pipe);

 	/* set clear color */
 	p->clear_color.f[0] = 0.3;
 	p->clear_color.f[1] = 0.1;
 	p->clear_color.f[2] = 0.3;
 	p->clear_color.f[3] = 1.0;

 	/* vertex buffer */
 	{
 		float vertices[4][2][4] = {
 			{
 				{ 0.9f, 0.9f, 0.0f, 1.0f },
 				{ 1.0f, 1.0f, 0.0f, 1.0f }
 			},
 			{
 				{ -0.9f, 0.9f, 0.0f, 1.0f },
 				{  0.0f, 1.0f, 0.0f, 1.0f }
 			},
 			{
 				{ -0.9f, -0.9f, 0.0f, 1.0f },
 				{  0.0f,  0.0f, 1.0f, 1.0f }
 			},
 			{
 				{ 0.9f, -0.9f, 0.0f, 1.0f },
 				{ 1.0f,  0.0f, 1.0f, 1.0f }
 			}
 		};

 		p->vbuf = pipe_buffer_create(p->screen, PIPE_BIND_VERTEX_BUFFER,
 					     PIPE_USAGE_STATIC, sizeof(vertices));
 		pipe_buffer_write(p->pipe, p->vbuf, 0, sizeof(vertices), vertices);
 	}

 	/* render target texture */
 	{
 		struct pipe_resource tmplt;
 		memset(&tmplt, 0, sizeof(tmplt));
 		tmplt.target = PIPE_TEXTURE_2D;
 		tmplt.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
 		tmplt.width0 = WIDTH;
 		tmplt.height0 = HEIGHT;
 		tmplt.depth0 = 1;
 		tmplt.array_size = 1;
 		tmplt.last_level = 0;
 		tmplt.bind = PIPE_BIND_RENDER_TARGET;

 		p->target = p->screen->resource_create(p->screen, &tmplt);
 	}

 	/* sampler texture */
 	{
 		uint32_t *ptr;
 		struct pipe_transfer *t;
 		struct pipe_resource t_tmplt;
 		struct pipe_sampler_view v_tmplt;
 		struct pipe_box box;

 		memset(&t_tmplt, 0, sizeof(t_tmplt));
 		t_tmplt.target = PIPE_TEXTURE_2D;
 		t_tmplt.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
 		t_tmplt.width0 = 2;
 		t_tmplt.height0 = 2;
 		t_tmplt.depth0 = 1;
 		t_tmplt.array_size = 1;
 		t_tmplt.last_level = 0;
 		t_tmplt.bind = PIPE_BIND_RENDER_TARGET;

 		p->tex = p->screen->resource_create(p->screen, &t_tmplt);

 		memset(&box, 0, sizeof(box));
 		box.width = 2;
 		box.height = 2;

 		t = p->pipe->get_transfer(p->pipe, p->tex, 0, PIPE_TRANSFER_WRITE, &box);

 		ptr = p->pipe->transfer_map(p->pipe, t);
 		ptr[0] = 0xffff0000;
 		ptr[1] = 0xff0000ff;
 		ptr[2] = 0xff00ff00;
 		ptr[3] = 0xffffff00;
 		p->pipe->transfer_unmap(p->pipe, t);

 		p->pipe->transfer_destroy(p->pipe, t);

 		u_sampler_view_default_template(&v_tmplt, p->tex, p->tex->format);

 		p->view = p->pipe->create_sampler_view(p->pipe, p->tex, &v_tmplt);
 	}

 	/* disabled blending/masking */
 	memset(&p->blend, 0, sizeof(p->blend));
 	p->blend.rt[0].colormask = PIPE_MASK_RGBA;

 	/* no-op depth/stencil/alpha */
 	memset(&p->depthstencil, 0, sizeof(p->depthstencil));

 	/* rasterizer */
 	memset(&p->rasterizer, 0, sizeof(p->rasterizer));
 	p->rasterizer.cull_face = PIPE_FACE_NONE;
 	p->rasterizer.gl_rasterization_rules = 1;
 	p->rasterizer.depth_clip = 1;

 	/* sampler */
 	memset(&p->sampler, 0, sizeof(p->sampler));
 	p->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 	p->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 	p->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 	p->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 	p->sampler.min_img_filter = PIPE_TEX_MIPFILTER_LINEAR;
 	p->sampler.mag_img_filter = PIPE_TEX_MIPFILTER_LINEAR;
 	p->sampler.normalized_coords = 1;

 	surf_tmpl.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
 	surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 	surf_tmpl.u.tex.level = 0;
 	surf_tmpl.u.tex.first_layer = 0;
 	surf_tmpl.u.tex.last_layer = 0;
 	/* drawing destination */
 	memset(&p->framebuffer, 0, sizeof(p->framebuffer));
 	p->framebuffer.width = WIDTH;
 	p->framebuffer.height = HEIGHT;
 	p->framebuffer.nr_cbufs = 1;
 	p->framebuffer.cbufs[0] = p->pipe->create_surface(p->pipe, p->target, &surf_tmpl);

 	/* viewport, depth isn't really needed */
 	{
 		float x = 0;
 		float y = 0;
 		float z = FAR;
 		float half_width = (float)WIDTH / 2.0f;
 		float half_height = (float)HEIGHT / 2.0f;
 		float half_depth = ((float)FAR - (float)NEAR) / 2.0f;
 		float scale, bias;

 		if (FLIP) {
 			scale = -1.0f;
 			bias = (float)HEIGHT;
 		} else {
 			scale = 1.0f;
 			bias = 0.0f;
 		}

 		p->viewport.scale[0] = half_width;
 		p->viewport.scale[1] = half_height * scale;
 		p->viewport.scale[2] = half_depth;
 		p->viewport.scale[3] = 1.0f;

 		p->viewport.translate[0] = half_width + x;
 		p->viewport.translate[1] = (half_height + y) * scale + bias;
 		p->viewport.translate[2] = half_depth + z;
 		p->viewport.translate[3] = 0.0f;
 	}

 	/* vertex elements state */
 	memset(p->velem, 0, sizeof(p->velem));
 	p->velem[0].src_offset = 0 * 4 * sizeof(float); /* offset 0, first element */
 	p->velem[0].instance_divisor = 0;
 	p->velem[0].vertex_buffer_index = 0;
 	p->velem[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;

 	p->velem[1].src_offset = 1 * 4 * sizeof(float); /* offset 16, second element */
 	p->velem[1].instance_divisor = 0;
 	p->velem[1].vertex_buffer_index = 0;
 	p->velem[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;

 	/* vertex shader */
 	{
 		const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 		                                TGSI_SEMANTIC_GENERIC };
 		const uint semantic_indexes[] = { 0, 0 };
 		p->vs = util_make_vertex_passthrough_shader(p->pipe, 2, semantic_names, semantic_indexes);
 	}

 	/* fragment shader */
 	p->fs = util_make_fragment_tex_shader(p->pipe, TGSI_TEXTURE_2D, TGSI_INTERPOLATE_LINEAR);
 }

 static void close_prog(struct program *p)
 {
 	/* unset bound textures as well */
 	cso_set_sampler_views(p->cso, PIPE_SHADER_FRAGMENT, 0, NULL);

 	/* unset all state */
 	cso_release_all(p->cso);

 	p->pipe->delete_vs_state(p->pipe, p->vs);
 	p->pipe->delete_fs_state(p->pipe, p->fs);

 	pipe_surface_reference(&p->framebuffer.cbufs[0], NULL);
 	pipe_sampler_view_reference(&p->view, NULL);
 	pipe_resource_reference(&p->target, NULL);
 	pipe_resource_reference(&p->tex, NULL);
 	pipe_resource_reference(&p->vbuf, NULL);

 	cso_destroy_context(p->cso);
 	p->pipe->destroy(p->pipe);
 	p->screen->destroy(p->screen);
 	pipe_loader_release(&p->dev, 1);

 	FREE(p);
 }

 static void draw(struct program *p)
 {
 	/* set the render target */
 	cso_set_framebuffer(p->cso, &p->framebuffer);

 	/* clear the render target */
 	p->pipe->clear(p->pipe, PIPE_CLEAR_COLOR, &p->clear_color, 0, 0);

 	/* set misc state we care about */
 	cso_set_blend(p->cso, &p->blend);
 	cso_set_depth_stencil_alpha(p->cso, &p->depthstencil);
 	cso_set_rasterizer(p->cso, &p->rasterizer);
 	cso_set_viewport(p->cso, &p->viewport);

 	/* sampler */
 	cso_single_sampler(p->cso, 0, &p->sampler);
 	cso_single_sampler_done(p->cso);

 	/* texture sampler view */
 	cso_set_sampler_views(p->cso, PIPE_SHADER_FRAGMENT, 1, &p->view);

 	/* shaders */
 	cso_set_fragment_shader_handle(p->cso, p->fs);
 	cso_set_vertex_shader_handle(p->cso, p->vs);

 	/* vertex element data */
 	cso_set_vertex_elements(p->cso, 2, p->velem);

 	util_draw_vertex_buffer(p->pipe, p->cso,
 	                        p->vbuf, 0,
 	                        PIPE_PRIM_QUADS,
 	                        4,  /* verts */
 	                        2); /* attribs/vert */

         p->pipe->flush(p->pipe, NULL);

 	debug_dump_surface_bmp(p->pipe, "result.bmp", p->framebuffer.cbufs[0]);
 }

 int main(int argc, char** argv)
 {
 	struct program *p = CALLOC_STRUCT(program);

 	init_prog(p);
 	draw(p);
 	close_prog(p);

 	return 0;
 }
	/**************************************************************************
	*
	* Copyright © 2010 Jakob Bornecrantz
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	* DEALINGS IN THE SOFTWARE.
	*
	**************************************************************************/


	#define USE_TRACE 0
	#define WIDTH 300
	#define HEIGHT 300
	#define NEAR 30
	#define FAR 1000
	#define FLIP 0

	/* pipe__state structs /
	#include "pipe/p_state.h"
	/* pipe_context */
	#include "pipe/p_context.h"
	/* pipe_screen */
	#include "pipe/p_screen.h"
	/* PIPE_* */
	#include "pipe/p_defines.h"
	/* TGSI_SEMANTIC_{POSITION\|GENERIC} */
	#include "pipe/p_shader_tokens.h"
	/* pipe_buffer_* helpers */
	#include "util/u_inlines.h"

	/* constant state object helper */
	#include "cso_cache/cso_context.h"

	/* u_sampler_view_default_template */
	#include "util/u_sampler.h"
	/* debug_dump_surface_bmp */
	#include "util/u_debug.h"
	/* util_draw_vertex_buffer helper */
	#include "util/u_draw_quad.h"
	/* FREE & CALLOC_STRUCT */
	#include "util/u_memory.h"
	/* util_make_[fragment\|vertex]_passthrough_shader */
	#include "util/u_simple_shaders.h"
	/* to get a hardware pipe driver */
	#include "pipe-loader/pipe_loader.h"

	struct program
	{
	struct pipe_loader_device *dev;
	struct pipe_screen *screen;
	struct pipe_context *pipe;
	struct cso_context *cso;

	struct pipe_blend_state blend;
	struct pipe_depth_stencil_alpha_state depthstencil;
	struct pipe_rasterizer_state rasterizer;
	struct pipe_sampler_state sampler;
	struct pipe_viewport_state viewport;
	struct pipe_framebuffer_state framebuffer;
	struct pipe_vertex_element velem[2];

	void *vs;
	void *fs;

	union pipe_color_union clear_color;

	struct pipe_resource *vbuf;
	struct pipe_resource *target;
	struct pipe_resource *tex;
	struct pipe_sampler_view *view;
	};

	static void init_prog(struct program *p)
	{
	struct pipe_surface surf_tmpl;
	int ret;

	/* find a hardware device */
	ret = pipe_loader_probe(&p->dev, 1);
	assert(ret);

	/* init a pipe screen */
	p->screen = pipe_loader_create_screen(p->dev, PIPE_SEARCH_DIR);
	assert(p->screen);

	/* create the pipe driver context and cso context */
	p->pipe = p->screen->context_create(p->screen, NULL);
	p->cso = cso_create_context(p->pipe);

	/* set clear color */
	p->clear_color.f[0] = 0.3;
	p->clear_color.f[1] = 0.1;
	p->clear_color.f[2] = 0.3;
	p->clear_color.f[3] = 1.0;

	/* vertex buffer */
	{
	float vertices[4][2][4] = {
	{
	{ 0.9f, 0.9f, 0.0f, 1.0f },
	{ 1.0f, 1.0f, 0.0f, 1.0f }
	},
	{
	{ -0.9f, 0.9f, 0.0f, 1.0f },
	{ 0.0f, 1.0f, 0.0f, 1.0f }
	},
	{
	{ -0.9f, -0.9f, 0.0f, 1.0f },
	{ 0.0f, 0.0f, 1.0f, 1.0f }
	},
	{
	{ 0.9f, -0.9f, 0.0f, 1.0f },
	{ 1.0f, 0.0f, 1.0f, 1.0f }
	}
	};

	p->vbuf = pipe_buffer_create(p->screen, PIPE_BIND_VERTEX_BUFFER,
	PIPE_USAGE_STATIC, sizeof(vertices));
	pipe_buffer_write(p->pipe, p->vbuf, 0, sizeof(vertices), vertices);
	}

	/* render target texture */
	{
	struct pipe_resource tmplt;
	memset(&tmplt, 0, sizeof(tmplt));
	tmplt.target = PIPE_TEXTURE_2D;
	tmplt.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
	tmplt.width0 = WIDTH;
	tmplt.height0 = HEIGHT;
	tmplt.depth0 = 1;
	tmplt.array_size = 1;
	tmplt.last_level = 0;
	tmplt.bind = PIPE_BIND_RENDER_TARGET;

	p->target = p->screen->resource_create(p->screen, &tmplt);
	}

	/* sampler texture */
	{
	uint32_t *ptr;
	struct pipe_transfer *t;
	struct pipe_resource t_tmplt;
	struct pipe_sampler_view v_tmplt;
	struct pipe_box box;

	memset(&t_tmplt, 0, sizeof(t_tmplt));
	t_tmplt.target = PIPE_TEXTURE_2D;
	t_tmplt.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
	t_tmplt.width0 = 2;
	t_tmplt.height0 = 2;
	t_tmplt.depth0 = 1;
	t_tmplt.array_size = 1;
	t_tmplt.last_level = 0;
	t_tmplt.bind = PIPE_BIND_RENDER_TARGET;

	p->tex = p->screen->resource_create(p->screen, &t_tmplt);

	memset(&box, 0, sizeof(box));
	box.width = 2;
	box.height = 2;

	t = p->pipe->get_transfer(p->pipe, p->tex, 0, PIPE_TRANSFER_WRITE, &box);

	ptr = p->pipe->transfer_map(p->pipe, t);
	ptr[0] = 0xffff0000;
	ptr[1] = 0xff0000ff;
	ptr[2] = 0xff00ff00;
	ptr[3] = 0xffffff00;
	p->pipe->transfer_unmap(p->pipe, t);

	p->pipe->transfer_destroy(p->pipe, t);

	u_sampler_view_default_template(&v_tmplt, p->tex, p->tex->format);

	p->view = p->pipe->create_sampler_view(p->pipe, p->tex, &v_tmplt);
	}

	/* disabled blending/masking */
	memset(&p->blend, 0, sizeof(p->blend));
	p->blend.rt[0].colormask = PIPE_MASK_RGBA;

	/* no-op depth/stencil/alpha */
	memset(&p->depthstencil, 0, sizeof(p->depthstencil));

	/* rasterizer */
	memset(&p->rasterizer, 0, sizeof(p->rasterizer));
	p->rasterizer.cull_face = PIPE_FACE_NONE;
	p->rasterizer.gl_rasterization_rules = 1;
	p->rasterizer.depth_clip = 1;

	/* sampler */
	memset(&p->sampler, 0, sizeof(p->sampler));
	p->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
	p->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
	p->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
	p->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
	p->sampler.min_img_filter = PIPE_TEX_MIPFILTER_LINEAR;
	p->sampler.mag_img_filter = PIPE_TEX_MIPFILTER_LINEAR;
	p->sampler.normalized_coords = 1;

	surf_tmpl.format = PIPE_FORMAT_B8G8R8A8_UNORM; /* All drivers support this */
	surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
	surf_tmpl.u.tex.level = 0;
	surf_tmpl.u.tex.first_layer = 0;
	surf_tmpl.u.tex.last_layer = 0;
	/* drawing destination */
	memset(&p->framebuffer, 0, sizeof(p->framebuffer));
	p->framebuffer.width = WIDTH;
	p->framebuffer.height = HEIGHT;
	p->framebuffer.nr_cbufs = 1;
	p->framebuffer.cbufs[0] = p->pipe->create_surface(p->pipe, p->target, &surf_tmpl);

	/* viewport, depth isn't really needed */
	{
	float x = 0;
	float y = 0;
	float z = FAR;
	float half_width = (float)WIDTH / 2.0f;
	float half_height = (float)HEIGHT / 2.0f;
	float half_depth = ((float)FAR - (float)NEAR) / 2.0f;
	float scale, bias;

	if (FLIP) {
	scale = -1.0f;
	bias = (float)HEIGHT;
	} else {
	scale = 1.0f;
	bias = 0.0f;
	}

	p->viewport.scale[0] = half_width;
	p->viewport.scale[1] = half_height * scale;
	p->viewport.scale[2] = half_depth;
	p->viewport.scale[3] = 1.0f;

	p->viewport.translate[0] = half_width + x;
	p->viewport.translate[1] = (half_height + y) * scale + bias;
	p->viewport.translate[2] = half_depth + z;
	p->viewport.translate[3] = 0.0f;
	}

	/* vertex elements state */
	memset(p->velem, 0, sizeof(p->velem));
	p->velem[0].src_offset = 0 * 4 * sizeof(float); /* offset 0, first element */
	p->velem[0].instance_divisor = 0;
	p->velem[0].vertex_buffer_index = 0;
	p->velem[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;

	p->velem[1].src_offset = 1 * 4 * sizeof(float); /* offset 16, second element */
	p->velem[1].instance_divisor = 0;
	p->velem[1].vertex_buffer_index = 0;
	p->velem[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;

	/* vertex shader */
	{
	const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
	TGSI_SEMANTIC_GENERIC };
	const uint semantic_indexes[] = { 0, 0 };
	p->vs = util_make_vertex_passthrough_shader(p->pipe, 2, semantic_names, semantic_indexes);
	}

	/* fragment shader */
	p->fs = util_make_fragment_tex_shader(p->pipe, TGSI_TEXTURE_2D, TGSI_INTERPOLATE_LINEAR);
	}

	static void close_prog(struct program *p)
	{
	/* unset bound textures as well */
	cso_set_sampler_views(p->cso, PIPE_SHADER_FRAGMENT, 0, NULL);

	/* unset all state */
	cso_release_all(p->cso);

	p->pipe->delete_vs_state(p->pipe, p->vs);
	p->pipe->delete_fs_state(p->pipe, p->fs);

	pipe_surface_reference(&p->framebuffer.cbufs[0], NULL);
	pipe_sampler_view_reference(&p->view, NULL);
	pipe_resource_reference(&p->target, NULL);
	pipe_resource_reference(&p->tex, NULL);
	pipe_resource_reference(&p->vbuf, NULL);

	cso_destroy_context(p->cso);
	p->pipe->destroy(p->pipe);
	p->screen->destroy(p->screen);
	pipe_loader_release(&p->dev, 1);

	FREE(p);
	}

	static void draw(struct program *p)
	{
	/* set the render target */
	cso_set_framebuffer(p->cso, &p->framebuffer);

	/* clear the render target */
	p->pipe->clear(p->pipe, PIPE_CLEAR_COLOR, &p->clear_color, 0, 0);

	/* set misc state we care about */
	cso_set_blend(p->cso, &p->blend);
	cso_set_depth_stencil_alpha(p->cso, &p->depthstencil);
	cso_set_rasterizer(p->cso, &p->rasterizer);
	cso_set_viewport(p->cso, &p->viewport);

	/* sampler */
	cso_single_sampler(p->cso, 0, &p->sampler);
	cso_single_sampler_done(p->cso);

	/* texture sampler view */
	cso_set_sampler_views(p->cso, PIPE_SHADER_FRAGMENT, 1, &p->view);

	/* shaders */
	cso_set_fragment_shader_handle(p->cso, p->fs);
	cso_set_vertex_shader_handle(p->cso, p->vs);

	/* vertex element data */
	cso_set_vertex_elements(p->cso, 2, p->velem);

	util_draw_vertex_buffer(p->pipe, p->cso,
	p->vbuf, 0,
	PIPE_PRIM_QUADS,
	4, /* verts */
	2); /* attribs/vert */

	p->pipe->flush(p->pipe, NULL);

	debug_dump_surface_bmp(p->pipe, "result.bmp", p->framebuffer.cbufs[0]);
	}

	int main(int argc, char** argv)
	{
	struct program *p = CALLOC_STRUCT(program);

	init_prog(p);
	draw(p);
	close_prog(p);

	return 0;
	}