Function TelcomDoPowerEffect

Descent3/TelCom.cpp:2295–2385

Draws a frame of the power up/down effect

//	Draws a frame of the power up/down effect
void TelcomDoPowerEffect(bool power_down, float frametime) {
  int height = (Telcom_system.Monitor_coords[MONITOR_MAIN].bottom) - (Telcom_system.Monitor_coords[MONITOR_MAIN].top);
  int width = (Telcom_system.Monitor_coords[MONITOR_MAIN].right) - (Telcom_system.Monitor_coords[MONITOR_MAIN].left);
  int xoff = Telcom_system.Monitor_coords[MONITOR_MAIN].left;
  int yoff = Telcom_system.Monitor_coords[MONITOR_MAIN].top;

  if (!power_down && TC_effect_position >= TCPE_STAGE2)
    goto tcpe_adjust;

  // draw the power effect at it's current state
  rend_SetAlphaType(AT_CONSTANT_TEXTURE);
  rend_SetAlphaValue(255);
  rend_SetLighting(LS_NONE);
  rend_SetColorModel(CM_MONO);
  rend_SetOverlayType(OT_NONE);
  rend_SetWrapType(WT_CLAMP);
  rend_SetFiltering(0);
  rend_SetZBufferState(0);

  if (TC_effect_position <= TCPE_STAGE1) {
    // stage 1
    int i, x, y;
    int line_count = (TC_effect_position - TCPE_START) / (TCPE_STAGE1 - TCPE_START) * ((float)((width / 32) + 3));
    if (line_count < 0)
      line_count = 0;

    for (y = 0; y < height; y += 32)
      for (x = 0; x < width; x += 32) {
        rend_DrawScaledBitmap(x + xoff, y + yoff, x + 32 + xoff, y + 32 + yoff, PowerBmps[0], 0, 0, 1, 1);
      }

    if (TC_effect_position < TCPE_START)
      goto tcpe_adjust;

    x = (width / 2) - (16 * line_count) + xoff;
    y = (height / 2) - 16 + yoff;

    for (i = 0; i < line_count; i++) {
      rend_DrawScaledBitmap(x, y, x + 32, y + 32, PowerBmps[1], 0, 0, 1, 1);
      x += 32;
    }
  } else {
    // stage 2
    int x, y, i;
    int gap;

    gap = ((float)height) * (TC_effect_position - TCPE_STAGE1) / (TCPE_STAGE2 - TCPE_STAGE1);
    int hcount = ((((float)height) / 2.0f) - (((float)gap) / 2.0f)) / 32.0f;

    for (i = 0; i < hcount; i++)
      for (x = 0; x < width; x += 32) {
        y = (i << 5);
        if (i == (hcount - 1)) {
          rend_SetAlphaType(AT_SATURATE_TEXTURE);
          rend_DrawScaledBitmap(x + xoff, y + 10 + yoff, x + 32 + xoff, y + 42 + yoff, PowerBmps[1], 0, 0, 1, 1);
          rend_SetAlphaType(AT_CONSTANT_TEXTURE);
        }
        rend_DrawScaledBitmap(x + xoff, y + yoff, x + 32 + xoff, y + 32 + yoff, PowerBmps[0], 0, 0, 1, 1);