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#include "video/video.h"
#include "game/game.h"
#define TEX_SPLIT (1.0 - BOW_DIST2) / (1 - BOW_DIST1)
#undef TEX_SPLIT
static float normal1[] = { 1.0, 0.0, 0.0 };
static float normal2[] = { 0.0, 1.0, 0.0 };
/*
getDists returns the minimum distance from (the wall) *line to the
specified (eye) point
the z component is ignored
*/
float getDist(segment2 *s, float* eye) {
float n[2];
float tmp[2];
n[0] = s->vStart.v[0] + s->vDirection.v[1];
n[1] = s->vStart.v[1] - s->vDirection.v[0];
tmp[0] = eye[0] - s->vStart.v[0];
tmp[1] = eye[1] - s->vStart.v[1];
if(n[0] == 0 && n[1] == 0) return length(tmp);
return abs(scalarprod2(n, tmp) / length(n));
}
/*
getSegmentEnd[XY]() returns the end point of the
last trail segment line (before the lightcycles bow starts)
*/
float dists[] = { BOW_DIST2, BOW_DIST3, BOW_DIST1, 0 };
float getSegmentEndX(Data *data, int dist) {
float tlength, blength;
segment2 *s = data->trails + data->trailOffset;
if(dirsX[data->dir] == 0)
return s->vStart.v[0] + s->vDirection.v[0];
tlength = segment2_Length(s);
blength = (tlength < 2 * BOW_LENGTH) ? tlength / 2 : BOW_LENGTH;
return
s->vStart.v[0] + s->vDirection.v[0] -
dists[dist] * blength * dirsX[ data->dir ];
}
float getSegmentEndY(Data *data, int dist) {
float tlength, blength;
segment2 *s = data->trails + data->trailOffset;
if(dirsY[data->dir] == 0)
return s->vStart.v[1] + s->vDirection.v[1];
tlength = segment2_Length(s);
blength = (tlength < 2 * BOW_LENGTH) ? tlength / 2 : BOW_LENGTH;
return
s->vStart.v[1] + s->vDirection.v[1] -
dists[dist] * blength * dirsY[ data->dir ];
}
/* getSegmentEndUV() calculates the texture coordinates for the last segment */
float getSegmentEndUV(segment2 *s, Data *data) {
float tlength, blength;
tlength = segment2_Length(s);
blength = (tlength < 2 * BOW_LENGTH) ? tlength / 2 : BOW_LENGTH;
return (tlength - 2 * blength) / DECAL_WIDTH;
}
/* getSegmentUV gets UV coordinates for an ordinary segment */
float getSegmentUV(segment2 *s) {
return segment2_Length(s) / DECAL_WIDTH;
}
/*
drawTrailLines() draws a white line on top of each trail segment
the alpha value is reduced with increasing distance to the player
*/
void drawTrailLines(Player *p, PlayerVisual *pV) {
segment2 *s;
float height;
float *normal;
Data *data;
Camera *cam;
float trail_top[] = { 1.0, 1.0, 1.0, 1.0 };
data = p->data;
cam = p->camera;
height = data->trail_height;
if(height <= 0) return;
/*
glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);
*/
if (gSettingsCache.antialias_lines) {
glEnable(GL_LINE_SMOOTH); /* enable line antialiasing */
}
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_LIGHTING);
glBegin(GL_LINES);
s = data->trails;
while(s != data->trails + data->trailOffset) {
/* the current line is not drawn */
/* compute distance from line to eye point */
getDist(s, cam->cam);
// alpha = (game2->rules.grid_size - dist / 2) / game2->rules.grid_size;
// trail_top[3] = alpha;
glColor4fv(trail_top);
if(s->vDirection.v[1] == 0) normal = normal1;
else normal = normal2;
glNormal3fv(normal);
glVertex3f(s->vStart.v[0],
s->vStart.v[1],
height);
glVertex3f(s->vStart.v[0] + s->vDirection.v[0],
s->vStart.v[1] + s->vDirection.v[1],
height);
s++;
polycount++;
}
glEnd();
/* compute distance from line to eye point */
getDist(s, cam->cam);
//alpha = (game2->rules.grid_size - dist / 2) / game2->rules.grid_size;
// trail_top[3] = alpha;
glColor4fv(trail_top);
glBegin(GL_LINES);
glVertex3f(s->vStart.v[0],
s->vStart.v[1],
height);
glVertex3f( getSegmentEndX(data, 0),
getSegmentEndY(data, 0),
height );
glEnd();
/* glEnable(GL_LIGHTING); */
glDisable(GL_BLEND);
glDisable(GL_LINE_SMOOTH); /* disable line antialiasing */
/*
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
*/
}
/*
drawTrailShadow() draws a alpha-blended shadow on the floor for each
trail segment.
The light source source is (in homogenous coordinates)
at (-1,-1,1,0) (I hope that's correct)
*/
void drawTrailShadow(Player* p, PlayerVisual *pV) {
/* states */
if(gSettingsCache.use_stencil) {
glEnable(GL_STENCIL_TEST);
glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
glStencilFunc(GL_GREATER, 1, 1);
glEnable(GL_BLEND);
glColor4fv(shadow_color);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
} else {
glColor3f(0, 0, 0);
glDisable(GL_BLEND);
}
/* transformation */
glPushMatrix();
glMultMatrixf(shadow_matrix);
/* geometry */
{
int vOffset = 0;
int iOffset = 0;
TrailMesh mesh;
mesh.pVertices = (vec3*) malloc(1000 * sizeof(vec3));
mesh.pNormals = (vec3*) malloc(1000 * sizeof(vec3));
mesh.pColors = (unsigned char*) malloc(1000 * 4 * sizeof(float));
mesh.pTexCoords = (vec2*) malloc(1000 * sizeof(vec2));
mesh.pIndices = (unsigned short*) malloc(1000 * 2);
mesh.iUsed = 0;
trailGeometry(p, pV, &mesh, &vOffset, &iOffset);
bowGeometry(p, pV, &mesh, &vOffset, &iOffset);
trailStatesShadowed();
trailRender(&mesh);
// no states restore, because we're drawing shadowed geometry
free(mesh.pVertices);
free(mesh.pNormals);
free(mesh.pColors);
free(mesh.pTexCoords);
free(mesh.pIndices);
}
/* restore */
if(gSettingsCache.use_stencil)
glDisable(GL_STENCIL_TEST);
glDisable(GL_BLEND);
glPopMatrix();
}
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