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atirage: Fix crtc_update.

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Add pixel format and pixel clock to the list of fields that will initiate a recalculation.
If frame rate is less than 24 or greater than 120 then assume 60Hz.
This commit is contained in:
joevt 2024-02-27 05:21:25 -08:00 committed by dingusdev
parent 9aef78be4f
commit d686fc04f4
1 changed files with 22 additions and 8 deletions
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30
devices/video/atirage.cpp
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@ -561,8 +561,11 @@ void ATIRage::crtc_update() {
need_recalc = true;
}
if (!need_recalc)
return;
int new_pixel_format = extract_bits<uint32_t>(this->regs[ATI_CRTC_GEN_CNTL], ATI_CRTC_PIX_WIDTH, ATI_CRTC_PIX_WIDTH_size);
if (new_pixel_format != this->pixel_format) {
this->pixel_format = new_pixel_format;
need_recalc = true;
}
// look up which VPLL ouput is requested
int clock_sel = extract_bits<uint32_t>(this->regs[ATI_CLOCK_CNTL], ATI_CLOCK_SEL, ATI_CLOCK_SEL_size);
@ -577,15 +580,26 @@ void ATIRage::crtc_update() {
((this->plls[VCLK_POST_DIV] >> (clock_sel * 2)) & 3);
// pixel clock = source_freq / post_div
this->pixel_clock = vpll_freq / mach64_post_div[post_div_idx];
float new_pixel_clock = vpll_freq / mach64_post_div[post_div_idx];
if (new_pixel_clock != this->pixel_clock) {
this->pixel_clock = new_pixel_clock;
need_recalc = true;
}
if (!need_recalc)
return;
// calculate display refresh rate
this->refresh_rate = pixel_clock / this->hori_total / this->vert_total;
// set up frame buffer converter
int pix_fmt = extract_bits<uint32_t>(this->regs[ATI_CRTC_GEN_CNTL], ATI_CRTC_PIX_WIDTH, ATI_CRTC_PIX_WIDTH_size);
if (this->refresh_rate < 24 || this->refresh_rate > 120) {
LOG_F(ERROR, "%s: Refresh rate is weird. Will try 60 Hz", this->name.c_str());
this->refresh_rate = 60;
this->pixel_clock = this->refresh_rate * this->hori_total / this->vert_total;
}
switch (pix_fmt) {
// set up frame buffer converter
switch (this->pixel_format) {
case 1:
this->convert_fb_cb = [this](uint8_t *dst_buf, int dst_pitch) {
this->convert_frame_4bpp_indexed(dst_buf, dst_pitch);
@ -624,13 +638,13 @@ void ATIRage::crtc_update() {
};
break;
default:
LOG_F(ERROR, "%s: unsupported pixel format %d", this->name.c_str(), pix_fmt);
LOG_F(ERROR, "%s: unsupported pixel format %d", this->name.c_str(), this->pixel_format);
}
static uint8_t bits_per_pixel[8] = {0, 4, 8, 16, 16, 24, 32, 0};
this->fb_pitch = extract_bits<uint32_t>(this->regs[ATI_CRTC_OFF_PITCH], ATI_CRTC_PITCH, ATI_CRTC_PITCH_size) *
(bits_per_pixel[pix_fmt & 7] * 8) >> 3;
(bits_per_pixel[this->pixel_format & 7] * 8) >> 3;
this->fb_ptr = &this->vram_ptr[extract_bits<uint32_t>(this->regs[ATI_CRTC_OFF_PITCH], ATI_CRTC_OFFSET, ATI_CRTC_OFFSET_size) * 8];