Function rend_DrawMultitexturePolygon3D

renderer/HardwareBaseGPU.cpp:665–756

Takes nv vertices and draws the polygon defined by those vertices. Uses bitmap "handle" as a texture

// Takes nv vertices and draws the polygon defined by those vertices.  Uses bitmap "handle"
// as a texture
void rend_DrawMultitexturePolygon3D(int handle, g3Point **p, int nv, int map_type) {
  g3Point *pnt;
  int i, fr, fg, fb;
  float alpha;

  float one_over_square_res = 1.0 / GameLightmaps[gpu_Overlay_map].square_res;
  float xscalar = (float)GameLightmaps[gpu_Overlay_map].width * one_over_square_res;
  float yscalar = (float)GameLightmaps[gpu_Overlay_map].height * one_over_square_res;

  ASSERT(nv < 100);

  if (gpu_state.cur_light_state == LS_NONE) {
    fr = GR_COLOR_RED(gpu_state.cur_color);
    fg = GR_COLOR_GREEN(gpu_state.cur_color);
    fb = GR_COLOR_BLUE(gpu_state.cur_color);
  }

  alpha = gpu_Alpha_multiplier * gpu_Alpha_factor;

  PosColorUV2Vertex *vData = &vArray2[0];

  // Specify our coordinates
  for (i = 0; i < nv; i++, vData++) {
    pnt = p[i];
    ASSERT(pnt->p3_flags & PF_ORIGPOINT);

    if (gpu_state.cur_alpha_type & ATF_VERTEX)
      alpha = pnt->p3_a * gpu_Alpha_multiplier * gpu_Alpha_factor;

    // If we have a lighting model, apply the correct lighting!
    if (gpu_state.cur_light_state != LS_NONE) {
      // Do lighting based on intesity (MONO) or colored (RGB)
      if (gpu_state.cur_color_model == CM_MONO) {
        vData->color.r = pnt->p3_l;
        vData->color.g = pnt->p3_l;
        vData->color.b = pnt->p3_l;
        vData->color.a = alpha;
      } else {
        vData->color.r = pnt->p3_r;
        vData->color.g = pnt->p3_g;
        vData->color.b = pnt->p3_b;
        vData->color.a = alpha;
      }
    } else {
      vData->color.r = 1;
      vData->color.g = 1;
      vData->color.b = 1;
      vData->color.a = alpha;
    }

    /*
    // Texture this polygon!
    float texw=1.0/(pnt->p3_z+Z_bias);
    vData->uv0.s=pnt->p3_u*texw;
    vData->uv0.t=pnt->p3_v*texw;
    vData->uv0.r=0;
    vData->uv0.w=texw;