diff options
Diffstat (limited to 'calc-gtf-cvt.cpp')
| -rw-r--r-- | calc-gtf-cvt.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/calc-gtf-cvt.cpp b/calc-gtf-cvt.cpp index 36f89f2..9cd6e5e 100644 --- a/calc-gtf-cvt.cpp +++ b/calc-gtf-cvt.cpp @@ -119,7 +119,10 @@ void edid_state::edid_gtf_mode(unsigned refresh, struct timings &t) #define CVT_MIN_VSYNC_BP 550.0 #define CVT_MIN_V_PORCH 3 -#define CVT_MIN_V_BPORCH 6 +/* Minimum vertical backporch for CVT and CVT RBv1 */ +#define CVT_MIN_V_BPORCH 7 +/* Fixed vertical backporch for CVT RBv2 and RBv3 */ +#define CVT_FIXED_V_BPORCH 6 #define CVT_C_PRIME 30.0 #define CVT_M_PRIME 300.0 #define CVT_RB_MIN_VBLANK 460.0 @@ -208,13 +211,14 @@ timings edid_state::calc_cvt_mode(unsigned h_pixels, unsigned v_lines, double h_period_est = ((1000000.0 / v_field_rate_rqd) - rb_min_vblank) / (v_lines_rnd + vert_margin * 2); double vbi_lines = floor(rb_min_vblank / h_period_est) + 1; - double rb_min_vbi = rb_v_fporch + v_sync + CVT_MIN_V_BPORCH; + double rb_min_vbi = rb_v_fporch + v_sync + + (rb == RB_CVT_V1 ? CVT_MIN_V_BPORCH : CVT_FIXED_V_BPORCH); v_blank = vbi_lines < rb_min_vbi ? rb_min_vbi : vbi_lines; double total_v_lines = v_blank + v_lines_rnd + vert_margin * 2 + interlace; if (rb == RB_CVT_V1) v_sync_bp = v_blank - rb_v_fporch; else - v_sync_bp = v_sync + CVT_MIN_V_BPORCH; + v_sync_bp = v_sync + CVT_FIXED_V_BPORCH; double total_pixels = h_blank + total_active_pixels; double freq = v_field_rate_rqd * total_v_lines * total_pixels * refresh_multiplier; if (rb == RB_CVT_V3) |