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/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_inlines.h"
#include "pipe/p_winsys.h"
#include "util/u_draw_quad.h"
/**
* Draw screen-aligned textured quad.
*/
void
util_draw_texquad(struct pipe_context *pipe,
float x0, float y0, float x1, float y1, float z)
{
struct pipe_buffer *vbuf;
struct pipe_vertex_buffer vbuffer;
struct pipe_vertex_element velement;
uint numAttribs = 2, vertexBytes, i, j;
float *v;
vertexBytes = 4 * (4 * numAttribs * sizeof(float));
/* XXX create one-time */
vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
PIPE_BUFFER_USAGE_VERTEX, vertexBytes);
assert(vbuf);
v = (float *) pipe->winsys->buffer_map(pipe->winsys, vbuf,
PIPE_BUFFER_USAGE_CPU_WRITE);
/*
* Load vertex buffer
*/
for (i = j = 0; i < 4; i++) {
v[j + 2] = z; /* z */
v[j + 3] = 1.0; /* w */
v[j + 6] = 0.0; /* r */
v[j + 7] = 1.0; /* q */
j += 8;
}
v[0] = x0;
v[1] = y0;
v[4] = 0.0; /*s*/
v[5] = 0.0; /*t*/
v[8] = x1;
v[9] = y0;
v[12] = 1.0;
v[13] = 0.0;
v[16] = x1;
v[17] = y1;
v[20] = 1.0;
v[21] = 1.0;
v[24] = x0;
v[25] = y1;
v[28] = 0.0;
v[29] = 1.0;
pipe->winsys->buffer_unmap(pipe->winsys, vbuf);
/* tell pipe about the vertex buffer */
vbuffer.buffer = vbuf;
vbuffer.pitch = numAttribs * 4 * sizeof(float); /* vertex size */
vbuffer.buffer_offset = 0;
pipe->set_vertex_buffer(pipe, 0, &vbuffer);
/* tell pipe about the vertex attributes */
for (i = 0; i < numAttribs; i++) {
velement.src_offset = i * 4 * sizeof(float);
velement.vertex_buffer_index = 0;
velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
velement.nr_components = 4;
pipe->set_vertex_element(pipe, i, &velement);
}
/* draw */
pipe->draw_arrays(pipe, PIPE_PRIM_TRIANGLE_FAN, 0, 4);
/* XXX: do one-time */
pipe_buffer_reference(pipe->winsys, &vbuf, NULL);
}
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