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#include "StdAfx.h"
#include "mmgr.h"
#include "glExtra.h"
#include "VertexArray.h"
#include "Map/Ground.h"
#include "Sim/Weapons/Weapon.h"
#include "LogOutput.h"
/*
* Draws a trigonometric circle in 'resolution' steps.
*/
static void defSurfaceCircle(const float3& center, float radius, unsigned int res)
{
CVertexArray* va=GetVertexArray();
va->Initialize();
for (unsigned int i = 0; i < res; ++i) {
const float radians = (2.0f * PI) * (float)i / (float)res;
float3 pos;
pos.x = center.x + (fastmath::sin(radians) * radius);
pos.z = center.z + (fastmath::cos(radians) * radius);
pos.y = ground->GetHeight(pos.x, pos.z) + 5.0f;
va->AddVertex0(pos);
}
va->DrawArray0(GL_LINE_LOOP);
}
static void defSurfaceSquare(const float3& center, float xsize, float zsize)
{
// FIXME: terrain contouring
const float3 p0 = center + float3(-xsize, 0.0f, -zsize);
const float3 p1 = center + float3( xsize, 0.0f, -zsize);
const float3 p2 = center + float3( xsize, 0.0f, zsize);
const float3 p3 = center + float3(-xsize, 0.0f, zsize);
CVertexArray* va=GetVertexArray();
va->Initialize();
va->AddVertex0(p0.x, ground->GetHeight(p0.x, p0.z), p0.z);
va->AddVertex0(p1.x, ground->GetHeight(p1.x, p1.z), p1.z);
va->AddVertex0(p2.x, ground->GetHeight(p2.x, p2.z), p2.z);
va->AddVertex0(p3.x, ground->GetHeight(p3.x, p3.z), p3.z);
va->DrawArray0(GL_LINE_LOOP);
}
SurfaceCircleFunc glSurfaceCircle = defSurfaceCircle;
SurfaceSquareFunc glSurfaceSquare = defSurfaceSquare;
void setSurfaceCircleFunc(SurfaceCircleFunc func)
{
glSurfaceCircle = (func == NULL)? defSurfaceCircle: func;
}
void setSurfaceSquareFunc(SurfaceSquareFunc func)
{
glSurfaceSquare = (func == NULL)? defSurfaceSquare: func;
}
/*
* Draws a trigonometric circle in 'resolution' steps, with a slope modifier
*/
void glBallisticCircle(const float3& center, const float radius,
const CWeapon* weapon,
unsigned int resolution, float slope)
{
CVertexArray* va=GetVertexArray();
va->Initialize();
for (unsigned int i = 0; i < resolution; ++i) {
const float radians = (2.0f * PI) * (float)i / (float)resolution;
float rad = radius;
float3 pos;
float sinR = fastmath::sin(radians);
float cosR = fastmath::cos(radians);
pos.x = center.x + (sinR * rad);
pos.z = center.z + (cosR * rad);
pos.y = ground->GetHeight(pos.x, pos.z);
float heightDiff = (pos.y - center.y)/2;
rad -= heightDiff * slope;
float adjRadius = weapon ? weapon->GetRange2D(heightDiff*weapon->heightMod) : rad;
float adjustment = rad/2;
float ydiff = 0;
int j;
for(j = 0; j < 50 && fabs(adjRadius - rad) + ydiff > .01*rad; j++){
if(adjRadius > rad) {
rad += adjustment;
} else {
rad -= adjustment;
adjustment /= 2;
}
pos.x = center.x + (sinR * rad);
pos.z = center.z + (cosR * rad);
float newY = ground->GetHeight(pos.x, pos.z);
ydiff = fabs(pos.y - newY);
pos.y = newY;
heightDiff = (pos.y - center.y);
adjRadius = weapon ? weapon->GetRange2D(heightDiff*weapon->heightMod) : rad;
}
pos.x = center.x + (sinR * adjRadius);
pos.z = center.z + (cosR * adjRadius);
pos.y = ground->GetHeight(pos.x, pos.z) + 5.0f;
va->AddVertex0(pos);
}
va->DrawArray0(GL_LINE_LOOP);
}
/******************************************************************************/
void glDrawVolume(DrawVolumeFunc drawFunc, const void* data)
{
glDepthMask(GL_FALSE);
glDisable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
glEnable(GL_DEPTH_CLAMP_NV);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glEnable(GL_STENCIL_TEST);
glStencilMask(0x1);
glStencilFunc(GL_ALWAYS, 0, 0x1);
glStencilOp(GL_KEEP, GL_INCR, GL_KEEP);
drawFunc(data); // draw
glDisable(GL_DEPTH_TEST);
glStencilFunc(GL_NOTEQUAL, 0, 0x1);
glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); // clear as we go
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glEnable(GL_CULL_FACE);
glCullFace(GL_FRONT);
drawFunc(data); // draw
glDisable(GL_DEPTH_CLAMP_NV);
glDisable(GL_STENCIL_TEST);
glDisable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
}
/******************************************************************************/
// not really the best place to put this
void gluMyCube(float size) {
const float mid = size * 0.5f;
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glBegin(GL_QUADS);
// top
glVertex3f( mid, mid, mid);
glVertex3f( mid, mid, -mid);
glVertex3f(-mid, mid, -mid);
glVertex3f(-mid, mid, mid);
// front
glVertex3f( mid, mid, mid);
glVertex3f(-mid, mid, mid);
glVertex3f(-mid, -mid, mid);
glVertex3f( mid, -mid, mid);
// right
glVertex3f(mid, mid, mid);
glVertex3f(mid, -mid, mid);
glVertex3f(mid, -mid, -mid);
glVertex3f(mid, mid, -mid);
// left
glVertex3f(-mid, mid, mid);
glVertex3f(-mid, mid, -mid);
glVertex3f(-mid, -mid, -mid);
glVertex3f(-mid, -mid, mid);
// bottom
glVertex3f( mid, -mid, mid);
glVertex3f( mid, -mid, -mid);
glVertex3f(-mid, -mid, -mid);
glVertex3f(-mid, -mid, mid);
// back
glVertex3f( mid, mid, -mid);
glVertex3f(-mid, mid, -mid);
glVertex3f(-mid, -mid, -mid);
glVertex3f( mid, -mid, -mid);
glEnd();
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
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