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atimach64gx: Don't recalculate if nothing changed.

This commit is contained in:
joevt 2024-02-28 01:43:58 -08:00 committed by dingusdev
parent 0a63e2946d
commit bcd057d45b
1 changed files with 16 additions and 3 deletions
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19
devices/video/atimach64gx.cpp
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@ -506,17 +506,30 @@ void AtiMach64Gx::crtc_update()
if (!bit_set(this->regs[ATI_CRTC_GEN_CNTL], ATI_CRTC_EXT_DISP_EN))
ABORT_F("%s: Current mode is VGA which is not supported", this->name.c_str());
bool need_recalc = false;
new_width = (extract_bits<uint32_t>(this->regs[ATI_CRTC_H_TOTAL_DISP], ATI_CRTC_H_DISP, ATI_CRTC_H_DISP_size) + 1) * 8;
new_height = extract_bits<uint32_t>(this->regs[ATI_CRTC_V_TOTAL_DISP], ATI_CRTC_V_DISP, ATI_CRTC_V_DISP_size) + 1;
if (new_width != this->active_width || new_height != this->active_height) {
this->create_display_window(new_width, new_height);
need_recalc = true;
}
// calculate display refresh rate
this->hori_total = (extract_bits<uint32_t>(this->regs[ATI_CRTC_H_TOTAL_DISP], ATI_CRTC_H_TOTAL, ATI_CRTC_H_TOTAL_size) + 1) * 8;
this->vert_total = extract_bits<uint32_t>(this->regs[ATI_CRTC_V_TOTAL_DISP], ATI_CRTC_V_TOTAL, ATI_CRTC_V_TOTAL_size) + 1;
uint32_t new_htotal, new_vtotal;
new_htotal = (extract_bits<uint32_t>(this->regs[ATI_CRTC_H_TOTAL_DISP], ATI_CRTC_H_TOTAL, ATI_CRTC_H_TOTAL_size) + 1) * 8;
new_vtotal = extract_bits<uint32_t>(this->regs[ATI_CRTC_V_TOTAL_DISP], ATI_CRTC_V_TOTAL, ATI_CRTC_V_TOTAL_size) + 1;
if (new_htotal != this->hori_total || new_vtotal != this->vert_total) {
this->hori_total = new_htotal;
this->vert_total = new_vtotal;
need_recalc = true;
}
if (!need_recalc)
return;
// calculate display refresh rate
this->refresh_rate = this->pixel_clock / this->hori_total / this->vert_total;
// specify framebuffer converter