Function g3_DrawBitmap

renderer/HardwareDraw.cpp:249–296

draws a bitmap with the specified 3d width & height If offsets are not -1, then the blitter draws not from the upper left hand corner of the bitmap, but from size*offsetx,size*offsety See Jason for explaination

// corner of the bitmap, but from size*offsetx,size*offsety
// See Jason for explaination
void g3_DrawBitmap(vector *pos, float width, float height, int bm, int color) {
  // get the view orientation
  matrix viewOrient;
  g3_GetUnscaledMatrix(&viewOrient);

  // break down the color into components
  float r, g, b;
  if (color != -1) {
    float scale = 1.0f / 255.0f;
    r = GR_COLOR_RED(color) * scale;
    g = GR_COLOR_GREEN(color) * scale;
    b = GR_COLOR_BLUE(color) * scale;
  }

  // calculate the four corners
  g3Point corners[4], *pts[4];
  int i;
  for (i = 0; i < 4; ++i) {
    pts[i] = &corners[i];

    // calculate the offset for this corner
    float cornerScaleU = ((i & 1) ^ ((i & 2) >> 1)) ? 1.0f : -1.0f;
    float cornerScaleV = (i & 2) ? 1.0f : -1.0f;

    // find the point (parallel to the view frame)
    vector cornerPos = *pos + (viewOrient.uvec * (height * -cornerScaleV)) + (viewOrient.rvec * (width * cornerScaleU));
    corners[i].p3_codes = 0;
    g3_RotatePoint(pts[i], &cornerPos);

    // setup the flags, UVs and colors
    corners[i].p3_flags |= PF_UV;
    corners[i].p3_uvl.u = (cornerScaleU * 0.5f) + 0.5f;
    corners[i].p3_uvl.v = (cornerScaleV * 0.5f) + 0.5f;
    if (color == -1) {
      corners[i].p3_flags |= PF_L;
      corners[i].p3_uvl.l = 1.0f;
    } else {
      corners[i].p3_flags |= PF_RGBA;
      corners[i].p3_uvl.r = r;
      corners[i].p3_uvl.g = g;
      corners[i].p3_uvl.b = b;
    }
    corners[i].p3_uvl.a = 1.0f;
  }

  rend_SetTextureType(TT_LINEAR);
  rend_DrawPolygon3D(bm, pts, 4);
}

// Draws a bitmap that has been rotated about its center.  Angle of rotation is passed as 'rot_angle'
void g3_DrawRotatedBitmap(vector *pos, angle rot_angle, float width, float height, int bm, int color) {