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/**************************************************************************
*
* Copyright 2007 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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "pipe/p_util.h"
#include "pipe/p_shader_tokens.h"
#include "draw_private.h"
#include "draw_context.h"
#include "draw_vertex.h"
#define DBG 0
/**
* Fetch a float[4] vertex attribute from memory, doing format/type
* conversion as needed.
* XXX this might be a temporary thing.
*/
static void
fetch_attrib4(const void *ptr, unsigned format, float attrib[4])
{
/* defaults */
attrib[1] = 0.0;
attrib[2] = 0.0;
attrib[3] = 1.0;
switch (format) {
case PIPE_FORMAT_R32G32B32A32_FLOAT:
attrib[3] = ((float *) ptr)[3];
/* fall-through */
case PIPE_FORMAT_R32G32B32_FLOAT:
attrib[2] = ((float *) ptr)[2];
/* fall-through */
case PIPE_FORMAT_R32G32_FLOAT:
attrib[1] = ((float *) ptr)[1];
/* fall-through */
case PIPE_FORMAT_R32_FLOAT:
attrib[0] = ((float *) ptr)[0];
break;
case PIPE_FORMAT_R32G32B32A32_SSCALED:
attrib[3] = (float) ((int *) ptr)[3];
/* fall-through */
case PIPE_FORMAT_R32G32B32_SSCALED:
attrib[2] = (float) ((int *) ptr)[2];
/* fall-through */
case PIPE_FORMAT_R32G32_SSCALED:
attrib[1] = (float) ((int *) ptr)[1];
/* fall-through */
case PIPE_FORMAT_R32_SSCALED:
attrib[0] = (float) ((int *) ptr)[0];
break;
case PIPE_FORMAT_A8R8G8B8_UNORM:
attrib[0] = (float) ((unsigned char *) ptr)[2] / 255.0f;
attrib[1] = (float) ((unsigned char *) ptr)[1] / 255.0f;
attrib[2] = (float) ((unsigned char *) ptr)[0] / 255.0f;
attrib[3] = (float) ((unsigned char *) ptr)[3] / 255.0f;
break;
default:
assert(0);
}
}
/**
* Fetch vertex attributes for 'count' vertices.
*/
void draw_vertex_fetch( struct draw_context *draw,
struct tgsi_exec_machine *machine,
const unsigned *elts,
unsigned count )
{
unsigned j;
/* loop over vertices */
for (j = 0; j < count; j++) {
uint attr;
#if DBG
printf("fetch vertex %u: \n", j);
#endif
/* loop over vertex attributes (vertex shader inputs) */
for (attr = 0; attr < draw->vertex_shader->state->num_inputs; attr++) {
unsigned buf = draw->vertex_element[attr].vertex_buffer_index;
const void *src
= (const void *) ((const ubyte *) draw->user.vbuffer[buf]
+ draw->vertex_buffer[buf].buffer_offset
+ draw->vertex_element[attr].src_offset
+ elts[j] * draw->vertex_buffer[buf].pitch);
float p[4];
fetch_attrib4(src, draw->vertex_element[attr].src_format, p);
#if DBG
printf(" %u: %f %f %f %f\n", attr, p[0], p[1], p[2], p[3]);
#endif
/* Transform to AoS xxxx/yyyy/zzzz/wwww representation:
*/
machine->Inputs[attr].xyzw[0].f[j] = p[0]; /*X*/
machine->Inputs[attr].xyzw[1].f[j] = p[1]; /*Y*/
machine->Inputs[attr].xyzw[2].f[j] = p[2]; /*Z*/
machine->Inputs[attr].xyzw[3].f[j] = p[3]; /*W*/
}
}
}
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