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gl_mdl.c
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gl_mdl.c
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/*
* mdl.c -- mdl model loader
* last modification: dec. 19, 2005
*
* Copyright (c) 2005 David HENRY
*
* 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 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.
*/
#include <GL/glu.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gl_mdl.h"
#include "misc.h"
/* table of precalculated normals */
vec3_t anorms_table[162] = {
{ -0.525731f, 0.000000f, 0.850651f },
{ -0.442863f, 0.238856f, 0.864188f },
{ -0.295242f, 0.000000f, 0.955423f },
{ -0.309017f, 0.500000f, 0.809017f },
{ -0.162460f, 0.262866f, 0.951056f },
{ 0.000000f, 0.000000f, 1.000000f },
{ 0.000000f, 0.850651f, 0.525731f },
{ -0.147621f, 0.716567f, 0.681718f },
{ 0.147621f, 0.716567f, 0.681718f },
{ 0.000000f, 0.525731f, 0.850651f },
{ 0.309017f, 0.500000f, 0.809017f },
{ 0.525731f, 0.000000f, 0.850651f },
{ 0.295242f, 0.000000f, 0.955423f },
{ 0.442863f, 0.238856f, 0.864188f },
{ 0.162460f, 0.262866f, 0.951056f },
{ -0.681718f, 0.147621f, 0.716567f },
{ -0.809017f, 0.309017f, 0.500000f },
{ -0.587785f, 0.425325f, 0.688191f },
{ -0.850651f, 0.525731f, 0.000000f },
{ -0.864188f, 0.442863f, 0.238856f },
{ -0.716567f, 0.681718f, 0.147621f },
{ -0.688191f, 0.587785f, 0.425325f },
{ -0.500000f, 0.809017f, 0.309017f },
{ -0.238856f, 0.864188f, 0.442863f },
{ -0.425325f, 0.688191f, 0.587785f },
{ -0.716567f, 0.681718f, -0.147621f },
{ -0.500000f, 0.809017f, -0.309017f },
{ -0.525731f, 0.850651f, 0.000000f },
{ 0.000000f, 0.850651f, -0.525731f },
{ -0.238856f, 0.864188f, -0.442863f },
{ 0.000000f, 0.955423f, -0.295242f },
{ -0.262866f, 0.951056f, -0.162460f },
{ 0.000000f, 1.000000f, 0.000000f },
{ 0.000000f, 0.955423f, 0.295242f },
{ -0.262866f, 0.951056f, 0.162460f },
{ 0.238856f, 0.864188f, 0.442863f },
{ 0.262866f, 0.951056f, 0.162460f },
{ 0.500000f, 0.809017f, 0.309017f },
{ 0.238856f, 0.864188f, -0.442863f },
{ 0.262866f, 0.951056f, -0.162460f },
{ 0.500000f, 0.809017f, -0.309017f },
{ 0.850651f, 0.525731f, 0.000000f },
{ 0.716567f, 0.681718f, 0.147621f },
{ 0.716567f, 0.681718f, -0.147621f },
{ 0.525731f, 0.850651f, 0.000000f },
{ 0.425325f, 0.688191f, 0.587785f },
{ 0.864188f, 0.442863f, 0.238856f },
{ 0.688191f, 0.587785f, 0.425325f },
{ 0.809017f, 0.309017f, 0.500000f },
{ 0.681718f, 0.147621f, 0.716567f },
{ 0.587785f, 0.425325f, 0.688191f },
{ 0.955423f, 0.295242f, 0.000000f },
{ 1.000000f, 0.000000f, 0.000000f },
{ 0.951056f, 0.162460f, 0.262866f },
{ 0.850651f, -0.525731f, 0.000000f },
{ 0.955423f, -0.295242f, 0.000000f },
{ 0.864188f, -0.442863f, 0.238856f },
{ 0.951056f, -0.162460f, 0.262866f },
{ 0.809017f, -0.309017f, 0.500000f },
{ 0.681718f, -0.147621f, 0.716567f },
{ 0.850651f, 0.000000f, 0.525731f },
{ 0.864188f, 0.442863f, -0.238856f },
{ 0.809017f, 0.309017f, -0.500000f },
{ 0.951056f, 0.162460f, -0.262866f },
{ 0.525731f, 0.000000f, -0.850651f },
{ 0.681718f, 0.147621f, -0.716567f },
{ 0.681718f, -0.147621f, -0.716567f },
{ 0.850651f, 0.000000f, -0.525731f },
{ 0.809017f, -0.309017f, -0.500000f },
{ 0.864188f, -0.442863f, -0.238856f },
{ 0.951056f, -0.162460f, -0.262866f },
{ 0.147621f, 0.716567f, -0.681718f },
{ 0.309017f, 0.500000f, -0.809017f },
{ 0.425325f, 0.688191f, -0.587785f },
{ 0.442863f, 0.238856f, -0.864188f },
{ 0.587785f, 0.425325f, -0.688191f },
{ 0.688191f, 0.587785f, -0.425325f },
{ -0.147621f, 0.716567f, -0.681718f },
{ -0.309017f, 0.500000f, -0.809017f },
{ 0.000000f, 0.525731f, -0.850651f },
{ -0.525731f, 0.000000f, -0.850651f },
{ -0.442863f, 0.238856f, -0.864188f },
{ -0.295242f, 0.000000f, -0.955423f },
{ -0.162460f, 0.262866f, -0.951056f },
{ 0.000000f, 0.000000f, -1.000000f },
{ 0.295242f, 0.000000f, -0.955423f },
{ 0.162460f, 0.262866f, -0.951056f },
{ -0.442863f, -0.238856f, -0.864188f },
{ -0.309017f, -0.500000f, -0.809017f },
{ -0.162460f, -0.262866f, -0.951056f },
{ 0.000000f, -0.850651f, -0.525731f },
{ -0.147621f, -0.716567f, -0.681718f },
{ 0.147621f, -0.716567f, -0.681718f },
{ 0.000000f, -0.525731f, -0.850651f },
{ 0.309017f, -0.500000f, -0.809017f },
{ 0.442863f, -0.238856f, -0.864188f },
{ 0.162460f, -0.262866f, -0.951056f },
{ 0.238856f, -0.864188f, -0.442863f },
{ 0.500000f, -0.809017f, -0.309017f },
{ 0.425325f, -0.688191f, -0.587785f },
{ 0.716567f, -0.681718f, -0.147621f },
{ 0.688191f, -0.587785f, -0.425325f },
{ 0.587785f, -0.425325f, -0.688191f },
{ 0.000000f, -0.955423f, -0.295242f },
{ 0.000000f, -1.000000f, 0.000000f },
{ 0.262866f, -0.951056f, -0.162460f },
{ 0.000000f, -0.850651f, 0.525731f },
{ 0.000000f, -0.955423f, 0.295242f },
{ 0.238856f, -0.864188f, 0.442863f },
{ 0.262866f, -0.951056f, 0.162460f },
{ 0.500000f, -0.809017f, 0.309017f },
{ 0.716567f, -0.681718f, 0.147621f },
{ 0.525731f, -0.850651f, 0.000000f },
{ -0.238856f, -0.864188f, -0.442863f },
{ -0.500000f, -0.809017f, -0.309017f },
{ -0.262866f, -0.951056f, -0.162460f },
{ -0.850651f, -0.525731f, 0.000000f },
{ -0.716567f, -0.681718f, -0.147621f },
{ -0.716567f, -0.681718f, 0.147621f },
{ -0.525731f, -0.850651f, 0.000000f },
{ -0.500000f, -0.809017f, 0.309017f },
{ -0.238856f, -0.864188f, 0.442863f },
{ -0.262866f, -0.951056f, 0.162460f },
{ -0.864188f, -0.442863f, 0.238856f },
{ -0.809017f, -0.309017f, 0.500000f },
{ -0.688191f, -0.587785f, 0.425325f },
{ -0.681718f, -0.147621f, 0.716567f },
{ -0.442863f, -0.238856f, 0.864188f },
{ -0.587785f, -0.425325f, 0.688191f },
{ -0.309017f, -0.500000f, 0.809017f },
{ -0.147621f, -0.716567f, 0.681718f },
{ -0.425325f, -0.688191f, 0.587785f },
{ -0.162460f, -0.262866f, 0.951056f },
{ 0.442863f, -0.238856f, 0.864188f },
{ 0.162460f, -0.262866f, 0.951056f },
{ 0.309017f, -0.500000f, 0.809017f },
{ 0.147621f, -0.716567f, 0.681718f },
{ 0.000000f, -0.525731f, 0.850651f },
{ 0.425325f, -0.688191f, 0.587785f },
{ 0.587785f, -0.425325f, 0.688191f },
{ 0.688191f, -0.587785f, 0.425325f },
{ -0.955423f, 0.295242f, 0.000000f },
{ -0.951056f, 0.162460f, 0.262866f },
{ -1.000000f, 0.000000f, 0.000000f },
{ -0.850651f, 0.000000f, 0.525731f },
{ -0.955423f, -0.295242f, 0.000000f },
{ -0.951056f, -0.162460f, 0.262866f },
{ -0.864188f, 0.442863f, -0.238856f },
{ -0.951056f, 0.162460f, -0.262866f },
{ -0.809017f, 0.309017f, -0.500000f },
{ -0.864188f, -0.442863f, -0.238856f },
{ -0.951056f, -0.162460f, -0.262866f },
{ -0.809017f, -0.309017f, -0.500000f },
{ -0.681718f, 0.147621f, -0.716567f },
{ -0.681718f, -0.147621f, -0.716567f },
{ -0.850651f, 0.000000f, -0.525731f },
{ -0.688191f, 0.587785f, -0.425325f },
{ -0.587785f, 0.425325f, -0.688191f },
{ -0.425325f, 0.688191f, -0.587785f },
{ -0.425325f, -0.688191f, -0.587785f },
{ -0.587785f, -0.425325f, -0.688191f },
{ -0.688191f, -0.587785f, -0.425325f }
};
/* palette */
unsigned char colormap[256][3] = {
{ 0, 0, 0}, { 15, 15, 15}, { 31, 31, 31}, { 47, 47, 47},
{ 63, 63, 63}, { 75, 75, 75}, { 91, 91, 91}, {107, 107, 107},
{123, 123, 123}, {139, 139, 139}, {155, 155, 155}, {171, 171, 171},
{187, 187, 187}, {203, 203, 203}, {219, 219, 219}, {235, 235, 235},
{ 15, 11, 7}, { 23, 15, 11}, { 31, 23, 11}, { 39, 27, 15},
{ 47, 35, 19}, { 55, 43, 23}, { 63, 47, 23}, { 75, 55, 27},
{ 83, 59, 27}, { 91, 67, 31}, { 99, 75, 31}, {107, 83, 31},
{115, 87, 31}, {123, 95, 35}, {131, 103, 35}, {143, 111, 35},
{ 11, 11, 15}, { 19, 19, 27}, { 27, 27, 39}, { 39, 39, 51},
{ 47, 47, 63}, { 55, 55, 75}, { 63, 63, 87}, { 71, 71, 103},
{ 79, 79, 115}, { 91, 91, 127}, { 99, 99, 139}, {107, 107, 151},
{115, 115, 163}, {123, 123, 175}, {131, 131, 187}, {139, 139, 203},
{ 0, 0, 0}, { 7, 7, 0}, { 11, 11, 0}, { 19, 19, 0},
{ 27, 27, 0}, { 35, 35, 0}, { 43, 43, 7}, { 47, 47, 7},
{ 55, 55, 7}, { 63, 63, 7}, { 71, 71, 7}, { 75, 75, 11},
{ 83, 83, 11}, { 91, 91, 11}, { 99, 99, 11}, {107, 107, 15},
{ 7, 0, 0}, { 15, 0, 0}, { 23, 0, 0}, { 31, 0, 0},
{ 39, 0, 0}, { 47, 0, 0}, { 55, 0, 0}, { 63, 0, 0},
{ 71, 0, 0}, { 79, 0, 0}, { 87, 0, 0}, { 95, 0, 0},
{103, 0, 0}, {111, 0, 0}, {119, 0, 0}, {127, 0, 0},
{ 19, 19, 0}, { 27, 27, 0}, { 35, 35, 0}, { 47, 43, 0},
{ 55, 47, 0}, { 67, 55, 0}, { 75, 59, 7}, { 87, 67, 7},
{ 95, 71, 7}, {107, 75, 11}, {119, 83, 15}, {131, 87, 19},
{139, 91, 19}, {151, 95, 27}, {163, 99, 31}, {175, 103, 35},
{ 35, 19, 7}, { 47, 23, 11}, { 59, 31, 15}, { 75, 35, 19},
{ 87, 43, 23}, { 99, 47, 31}, {115, 55, 35}, {127, 59, 43},
{143, 67, 51}, {159, 79, 51}, {175, 99, 47}, {191, 119, 47},
{207, 143, 43}, {223, 171, 39}, {239, 203, 31}, {255, 243, 27},
{ 11, 7, 0}, { 27, 19, 0}, { 43, 35, 15}, { 55, 43, 19},
{ 71, 51, 27}, { 83, 55, 35}, { 99, 63, 43}, {111, 71, 51},
{127, 83, 63}, {139, 95, 71}, {155, 107, 83}, {167, 123, 95},
{183, 135, 107}, {195, 147, 123}, {211, 163, 139}, {227, 179, 151},
{171, 139, 163}, {159, 127, 151}, {147, 115, 135}, {139, 103, 123},
{127, 91, 111}, {119, 83, 99}, {107, 75, 87}, { 95, 63, 75},
{ 87, 55, 67}, { 75, 47, 55}, { 67, 39, 47}, { 55, 31, 35},
{ 43, 23, 27}, { 35, 19, 19}, { 23, 11, 11}, { 15, 7, 7},
{187, 115, 159}, {175, 107, 143}, {163, 95, 131}, {151, 87, 119},
{139, 79, 107}, {127, 75, 95}, {115, 67, 83}, {107, 59, 75},
{ 95, 51, 63}, { 83, 43, 55}, { 71, 35, 43}, { 59, 31, 35},
{ 47, 23, 27}, { 35, 19, 19}, { 23, 11, 11}, { 15, 7, 7},
{219, 195, 187}, {203, 179, 167}, {191, 163, 155}, {175, 151, 139},
{163, 135, 123}, {151, 123, 111}, {135, 111, 95}, {123, 99, 83},
{107, 87, 71}, { 95, 75, 59}, { 83, 63, 51}, { 67, 51, 39},
{ 55, 43, 31}, { 39, 31, 23}, { 27, 19, 15}, { 15, 11, 7},
{111, 131, 123}, {103, 123, 111}, { 95, 115, 103}, { 87, 107, 95},
{ 79, 99, 87}, { 71, 91, 79}, { 63, 83, 71}, { 55, 75, 63},
{ 47, 67, 55}, { 43, 59, 47}, { 35, 51, 39}, { 31, 43, 31},
{ 23, 35, 23}, { 15, 27, 19}, { 11, 19, 11}, { 7, 11, 7},
{255, 243, 27}, {239, 223, 23}, {219, 203, 19}, {203, 183, 15},
{187, 167, 15}, {171, 151, 11}, {155, 131, 7}, {139, 115, 7},
{123, 99, 7}, {107, 83, 0}, { 91, 71, 0}, { 75, 55, 0},
{ 59, 43, 0}, { 43, 31, 0}, { 27, 15, 0}, { 11, 7, 0},
{ 0, 0, 255}, { 11, 11, 239}, { 19, 19, 223}, { 27, 27, 207},
{ 35, 35, 191}, { 43, 43, 175}, { 47, 47, 159}, { 47, 47, 143},
{ 47, 47, 127}, { 47, 47, 111}, { 47, 47, 95}, { 43, 43, 79},
{ 35, 35, 63}, { 27, 27, 47}, { 19, 19, 31}, { 11, 11, 15},
{ 43, 0, 0}, { 59, 0, 0}, { 75, 7, 0}, { 95, 7, 0},
{111, 15, 0}, {127, 23, 7}, {147, 31, 7}, {163, 39, 11},
{183, 51, 15}, {195, 75, 27}, {207, 99, 43}, {219, 127, 59},
{227, 151, 79}, {231, 171, 95}, {239, 191, 119}, {247, 211, 139},
{167, 123, 59}, {183, 155, 55}, {199, 195, 55}, {231, 227, 87},
{127, 191, 255}, {171, 231, 255}, {215, 255, 255}, {103, 0, 0},
{139, 0, 0}, {179, 0, 0}, {215, 0, 0}, {255, 0, 0},
{255, 243, 147}, {255, 247, 199}, {255, 255, 255}, {159, 91, 83},
};
static GLuint MakeTexture(int n, mdl_model_t *mdl) {
int i;
GLuint id;
GLubyte *pixels = (GLubyte *)malloc(sizeof (GLubyte) *
mdl->header.skinwidth *
mdl->header.skinheight * 3);
/* convert indexed 8 bits texture to RGB 24 bits */
for (i = 0; i < mdl->header.skinwidth * mdl->header.skinheight; ++i) {
pixels[(i * 3) + 0] = colormap[mdl->skins[n].data[i]][0];
pixels[(i * 3) + 1] = colormap[mdl->skins[n].data[i]][1];
pixels[(i * 3) + 2] = colormap[mdl->skins[n].data[i]][2];
}
/* generate OpenGL texture */
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, mdl->header.skinwidth,
mdl->header.skinheight, GL_RGB, GL_UNSIGNED_BYTE,
pixels);
/* OpenGL has its own copy of image data */
free(pixels);
return id;
}
int mdl_load(mdl_model_t *mdl, const char *filename) {
FILE *fp;
int i;
fp = fopen(filename, "rb");
if (!fp) {
die("error: couldn't open '%s'", filename);
return 0;
}
/* read header */
fread (&mdl->header, 1, sizeof (mdl_header_t), fp);
if ((mdl->header.ident != 1330660425) ||
(mdl->header.version != 6)) {
/* error! */
fclose (fp);
die("error: %s is not a mdl file", filename);
return 0;
}
/* memory allocation */
mdl->skins = (mdl_skin_t *) malloc(sizeof (mdl_skin_t) * mdl->header.num_skins);
mdl->texcoords = (mdl_texCoord_t *)malloc(sizeof (mdl_texCoord_t) * mdl->header.num_verts);
mdl->triangles = (mdl_triangle_t *)malloc(sizeof (mdl_triangle_t) * mdl->header.num_tris);
mdl->frames = (mdl_frame_t *) malloc(sizeof (mdl_frame_t) * mdl->header.num_frames);
mdl->tex_id = (GLuint *) malloc(sizeof (GLuint) * mdl->header.num_skins);
mdl->iskin = 0;
/* read texture data */
for (i = 0; i < mdl->header.num_skins; ++i) {
mdl->skins[i].data = (GLubyte *)malloc(sizeof (GLubyte) *
mdl->header.skinwidth *
mdl->header.skinheight);
fread(&mdl->skins[i].group, sizeof (int), 1, fp);
fread(mdl->skins[i].data, sizeof (GLubyte),
mdl->header.skinwidth * mdl->header.skinheight, fp);
mdl->tex_id[i] = MakeTexture (i, mdl);
free (mdl->skins[i].data);
mdl->skins[i].data = NULL;
}
fread (mdl->texcoords, sizeof (mdl_texCoord_t), mdl->header.num_verts, fp);
fread (mdl->triangles, sizeof (mdl_triangle_t), mdl->header.num_tris, fp);
/* read frames */
for (i = 0; i < mdl->header.num_frames; ++i) {
/* memory allocation for vertices of this frame */
mdl->frames[i].frame.verts = (mdl_vertex_t *)
malloc (sizeof (mdl_vertex_t) * mdl->header.num_verts);
/* read frame data */
fread (&mdl->frames[i].type, sizeof (long), 1, fp);
fread (&mdl->frames[i].frame.bboxmin, sizeof (mdl_vertex_t), 1, fp);
fread (&mdl->frames[i].frame.bboxmax, sizeof (mdl_vertex_t), 1, fp);
fread (mdl->frames[i].frame.name, sizeof (char), 16, fp);
// printf("%d %s\n", i, mdl->frames[i].frame.name);
fread (mdl->frames[i].frame.verts, sizeof (mdl_vertex_t),
mdl->header.num_verts, fp);
}
fclose (fp);
return 1;
}
void mdl_free(mdl_model_t *mdl) {
int i;
if (mdl->skins) free (mdl->skins);
if (mdl->texcoords) free (mdl->texcoords);
if (mdl->triangles) free (mdl->triangles);
if (mdl->tex_id) {
/* delete OpenGL textures */
glDeleteTextures (mdl->header.num_skins, mdl->tex_id);
free (mdl->tex_id);
}
if (mdl->frames) {
for (i = 0; i < mdl->header.num_frames; ++i)
free(mdl->frames[i].frame.verts);
free(mdl->frames);
}
}
void mdl_render_frame(const mdl_model_t *mdl, int n) {
int i, j;
GLfloat s, t;
vec3_t v;
mdl_vertex_t *pvert;
/* check if n is in a valid range */
if ((n < 0) || (n > mdl->header.num_frames - 1))
return;
/* enable model's texture */
glBindTexture (GL_TEXTURE_2D, mdl->tex_id[mdl->iskin]);
/* draw the model */
glBegin (GL_TRIANGLES);
/* draw each triangle */
for (i = 0; i < mdl->header.num_tris; ++i) {
/* draw each vertex */
for (j = 0; j < 3; ++j) {
pvert = &mdl->frames[n].frame.verts[mdl->triangles[i].vertex[j]];
/* compute texture coordinates */
s = (GLfloat)mdl->texcoords[mdl->triangles[i].vertex[j]].s;
t = (GLfloat)mdl->texcoords[mdl->triangles[i].vertex[j]].t;
if (!mdl->triangles[i].facesfront &&
mdl->texcoords[mdl->triangles[i].vertex[j]].onseam)
s += mdl->header.skinwidth * 0.5f; /* backface */
/* scale s and t to range from 0.0 to 1.0 */
s = (s + 0.5) / mdl->header.skinwidth;
t = (t + 0.5) / mdl->header.skinheight;
/* pass texture coordinates to OpenGL */
glTexCoord2f (s, t);
/* normal vector */
glNormal3fv (anorms_table [pvert->normalIndex]);
/* calculate real vertex position */
v[0] = (mdl->header.scale[0] * pvert->v[0]) + mdl->header.translate[0];
v[1] = (mdl->header.scale[1] * pvert->v[1]) + mdl->header.translate[1];
v[2] = (mdl->header.scale[2] * pvert->v[2]) + mdl->header.translate[2];
glVertex3fv (v);
}
}
glEnd ();
}
#if 0
void RenderFrameItp (int n, float interp, mdl_model_t *mdl) {
int i, j;
GLfloat s, t;
vec3_t norm, v;
GLfloat *n_curr, *n_next;
mdl_vertex_t *pvert1, *pvert2;
/* check if n is in a valid range */
if ((n < 0) || (n > mdl->header.num_frames))
return;
/* enable model's texture */
glBindTexture (GL_TEXTURE_2D, mdl->tex_id[mdl->iskin]);
/* draw the model */
glBegin (GL_TRIANGLES);
/* draw each triangle */
for (i = 0; i < mdl->header.num_tris; ++i) {
/* draw each vertex */
for (j = 0; j < 3; ++j) {
pvert1 = &mdl->frames[n].frame.verts[mdl->triangles[i].vertex[j]];
pvert2 = &mdl->frames[n + 1].frame.verts[mdl->triangles[i].vertex[j]];
/* compute texture coordinates */
s = (GLfloat)mdl->texcoords[mdl->triangles[i].vertex[j]].s;
t = (GLfloat)mdl->texcoords[mdl->triangles[i].vertex[j]].t;
if (!mdl->triangles[i].facesfront &&
mdl->texcoords[mdl->triangles[i].vertex[j]].onseam)
s += mdl->header.skinwidth * 0.5f; /* backface */
/* scale s and t to range from 0.0 to 1.0 */
s = (s + 0.5) / mdl->header.skinwidth;
t = (t + 0.5) / mdl->header.skinheight;
/* pass texture coordinates to OpenGL */
glTexCoord2f (s, t);
/* interpolate normals */
/*
memcpy (n_curr, anorms_table[pvert1->normalIndex], sizeof (vec3_t));
memcpy (n_next, anorms_table[pvert2->normalIndex], sizeof (vec3_t));
*/
n_curr = anorms_table[pvert1->normalIndex];
n_next = anorms_table[pvert2->normalIndex];
norm[0] = n_curr[0] + interp * (n_next[0] - n_curr[0]);
norm[1] = n_curr[1] + interp * (n_next[1] - n_curr[1]);
norm[2] = n_curr[2] + interp * (n_next[2] - n_curr[2]);
glNormal3fv (norm);
/* interpolate vertices */
v[0] = mdl->header.scale[0] * (pvert1->v[0] + interp
* (pvert2->v[0] - pvert1->v[0])) + mdl->header.translate[0];
v[1] = mdl->header.scale[1] * (pvert1->v[1] + interp
* (pvert2->v[1] - pvert1->v[1])) + mdl->header.translate[1];
v[2] = mdl->header.scale[2] * (pvert1->v[2] + interp
* (pvert2->v[2] - pvert1->v[2])) + mdl->header.translate[2];
glVertex3fv (v);
}
}
glEnd ();
}
#endif