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249 lines
6.3 KiB
C++
249 lines
6.3 KiB
C++
// This file implements the API calls that draw particle groups in Half-life
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#include "general.h"
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#ifdef WIN32
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// This is for something in gl.h.
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#include <windows.h>
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#else
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#include <GL/gl.h>
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#endif
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#include "common/triangleapi.h"
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#include "cl_dll/wrect.h"
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#include "cl_dll/cl_dll.h"
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#include "common/renderingconst.h"
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#include "particles/papi.h"
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// XXX #include <iostream.h>
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// Draw as a splat texture on a quad.
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void DrawGroupTriSplat(const pVector &view, const pVector &up,
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float size_scale, bool draw_tex,
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bool const_size, bool const_color)
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{
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int cnt = pGetGroupCount();
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if(cnt < 1)
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return;
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pVector *ppos = new pVector[cnt];
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float *color = const_color ? NULL : new float[cnt * 4];
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pVector *size = const_size ? NULL : new pVector[cnt];
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pGetParticles(0, cnt, (float *)ppos, color, NULL, (float *)size);
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// Compute the vectors from the particle to the corners of its tri.
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// 2
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// |\ The particle is at the center of the x.
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// |-\ V0, V1, and V2 go from there to the vertices.
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// |x|\ The texcoords are (0,0), (2,0), and (0,2) respectively.
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// 0-+-1 We clamp the texture so the rest is transparent.
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pVector right = view ^ up;
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right.normalize();
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pVector nup = right ^ view;
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right *= size_scale;
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nup *= size_scale;
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pVector V0 = -(right + nup);
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pVector V1 = V0 + right * 4;
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pVector V2 = V0 + nup*4 + right*2;
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//cerr << "x " << view.x << " " << view.y << " " << view.z << endl;
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//cerr << "x " << nup.x << " " << nup.y << " " << nup.z << endl;
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//cerr << "x " << right.x << " " << right.y << " " << right.z << endl;
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//cerr << "x " << V0.x << " " << V0.y << " " << V0.z << endl;
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//glBegin(GL_TRIANGLES);
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gEngfuncs.pTriAPI->Begin( TRI_TRIANGLES );
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//gEngfuncs.pTriAPI->RenderMode( kRenderTransAlpha );
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for(int i = 0; i < cnt; i++)
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{
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pVector &p = ppos[i];
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float* theCurrentColor = &color[i*4];
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if(!const_color)
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{
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//glColor4fv((GLfloat *)&color[i*4]);
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gEngfuncs.pTriAPI->Color4f(theCurrentColor[0], theCurrentColor[1], theCurrentColor[2], theCurrentColor[3]);
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}
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//else
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//{
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// gEngfuncs.pTriAPI->Color4f(1.0f, 1.0f, 1.0f, .5f);
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//}
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pVector sV0 = V0;
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pVector sV1 = V1;
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pVector sV2 = V2;
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if(!const_size)
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{
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sV0 *= size[i].x;
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sV1 *= size[i].x;
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sV2 *= size[i].x;
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}
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//if(draw_tex) glTexCoord2f(0,0);
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if(draw_tex) gEngfuncs.pTriAPI->TexCoord2f(0,0);
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pVector ver = p + sV0;
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//glVertex3fv((GLfloat *)&ver);
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gEngfuncs.pTriAPI->Vertex3fv((float*)&ver);
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//if(draw_tex) glTexCoord2f(2,0);
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if(draw_tex) gEngfuncs.pTriAPI->TexCoord2f(1,0);
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ver = p + sV1;
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//glVertex3fv((GLfloat *)&ver);
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gEngfuncs.pTriAPI->Vertex3fv((float*)&ver);
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//if(draw_tex) glTexCoord2f(0,2);
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if(draw_tex) gEngfuncs.pTriAPI->TexCoord2f(.5,1);
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ver = p + sV2;
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//glVertex3fv((GLfloat *)&ver);
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gEngfuncs.pTriAPI->Vertex3fv((float*)&ver);
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}
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//glEnd();
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gEngfuncs.pTriAPI->End();
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delete [] ppos;
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if(color) delete [] color;
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if(size) delete [] size;
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}
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// Emit OpenGL calls to draw the particles. These are drawn with
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// whatever primitive type the user specified(GL_POINTS, for
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// example). The color and radius are set per primitive, by default.
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// For GL_LINES, the other vertex of the line is the velocity vector.
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// XXX const_size is ignored.
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//PARTICLEDLL_API void pDrawGroupp(int primitive, bool const_size, bool const_color)
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//{
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// _ParticleState &_ps = _GetPState();
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//
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// // Get a pointer to the particles in gp memory
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// ParticleGroup *pg = _ps.pgrp;
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//
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// if(pg == NULL)
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// return; // ERROR
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//
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// if(pg->p_count < 1)
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// return;
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//
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// if(primitive == GL_POINTS)
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// {
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// glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
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// glEnableClientState(GL_VERTEX_ARRAY);
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// if(!const_color)
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// {
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// glEnableClientState(GL_COLOR_ARRAY);
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// glColorPointer(4, GL_FLOAT, sizeof(Particle), &pg->list[0].color);
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// }
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//
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// glVertexPointer(3, GL_FLOAT, sizeof(Particle), &pg->list[0].pos);
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// glDrawArrays((GLenum)primitive, 0, pg->p_count);
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// glPopClientAttrib();
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// // XXX For E&S
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// glDisableClientState(GL_COLOR_ARRAY);
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// }
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// else
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// {
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// // Assume GL_LINES
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// glBegin((GLenum)primitive);
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//
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// if(!const_color)
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// {
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// for(int i = 0; i < pg->p_count; i++)
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// {
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// Particle &m = pg->list[i];
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//
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// // Warning: this depends on alpha following color in the Particle struct.
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// glColor4fv((GLfloat *)&m.color);
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// glVertex3fv((GLfloat *)&m.pos);
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//
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// // For lines, make a tail with the velocity vector's direction and
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// // a length of radius.
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// pVector tail = m.pos - m.vel;
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// glVertex3fv((GLfloat *)&tail);
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// }
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// }
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// else
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// {
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// for(int i = 0; i < pg->p_count; i++)
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// {
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// Particle &m = pg->list[i];
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// glVertex3fv((GLfloat *)&m.pos);
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//
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// // For lines, make a tail with the velocity vector's direction and
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// // a length of radius.
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// pVector tail = m.pos - m.vel;
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// glVertex3fv((GLfloat *)&tail);
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// }
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// }
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// glEnd();
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// }
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//}
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//
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//PARTICLEDLL_API void pDrawGroupl(int dlist, bool const_size, bool const_color, bool const_rotation)
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//{
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// _ParticleState &_ps = _GetPState();
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//
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// // Get a pointer to the particles in gp memory
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// ParticleGroup *pg = _ps.pgrp;
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// if(pg == NULL)
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// return; // ERROR
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//
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// if(pg->p_count < 1)
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// return;
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//
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// //if(const_color)
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// // glColor4fv((GLfloat *)&pg->list[0].color);
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//
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// for(int i = 0; i < pg->p_count; i++)
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// {
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// Particle &m = pg->list[i];
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//
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// glPushMatrix();
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// glTranslatef(m.pos.x, m.pos.y, m.pos.z);
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//
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// if(!const_size)
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// glScalef(m.size.x, m.size.y, m.size.z);
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// else
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// glScalef(pg->list[i].size.x, pg->list[i].size.y, pg->list[i].size.z);
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//
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// // Expensive! A sqrt, cross prod and acos. Yow.
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// if(!const_rotation)
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// {
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// pVector vN(m.vel);
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// vN.normalize();
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// pVector voN(m.velB);
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// voN.normalize();
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//
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// pVector biN;
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// if(voN.x == vN.x && voN.y == vN.y && voN.z == vN.z)
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// biN = pVector(0, 1, 0);
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// else
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// biN = vN ^ voN;
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// biN.normalize();
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//
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// pVector N(vN ^ biN);
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//
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// double M[16];
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// M[0] = vN.x; M[4] = biN.x; M[8] = N.x; M[12] = 0;
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// M[1] = vN.y; M[5] = biN.y; M[9] = N.y; M[13] = 0;
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// M[2] = vN.z; M[6] = biN.z; M[10] = N.z; M[14] = 0;
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// M[3] = 0; M[7] = 0; M[11] = 0; M[15] = 1;
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// glMultMatrixd(M);
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// }
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//
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// // Warning: this depends on alpha following color in the Particle struct.
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// if(!const_color)
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// glColor4fv((GLfloat *)&m.color);
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//
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// glCallList(dlist);
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//
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// glPopMatrix();
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// }
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//}
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