summaryrefslogtreecommitdiff
path: root/kms++/src
diff options
context:
space:
mode:
Diffstat (limited to 'kms++/src')
-rw-r--r--kms++/src/mode_cvt.cpp154
1 files changed, 154 insertions, 0 deletions
diff --git a/kms++/src/mode_cvt.cpp b/kms++/src/mode_cvt.cpp
new file mode 100644
index 0000000..41503c7
--- /dev/null
+++ b/kms++/src/mode_cvt.cpp
@@ -0,0 +1,154 @@
+// Supports CVT 1.2 reduced blanking modes v1 and v2
+
+#include <kms++/kms++.h>
+#include <cmath>
+
+using namespace std;
+
+namespace kms
+{
+
+static float CELL_GRAN = 8;
+static float CELL_GRAN_RND = round(CELL_GRAN);
+
+struct CVTConsts
+{
+ float CLOCK_STEP;
+ float MIN_V_BPORCH;
+ float RB_H_BLANK;
+ float RB_H_FPORCH;
+ float RB_H_SYNC;
+ float RB_H_BPORCH;
+ float RB_MIN_V_BLANK;
+ float RB_V_FPORCH;
+ float REFRESH_MULTIPLIER;
+};
+
+static const CVTConsts cvt_consts_v1 =
+{
+ .CLOCK_STEP = 0.25, // Fixed
+ .MIN_V_BPORCH = 6, // Min
+ .RB_H_BLANK = 160, // Fixed
+ .RB_H_FPORCH = 48, // Fixed
+ .RB_H_SYNC = 32, // Fixed
+ .RB_H_BPORCH = 80, // Fixed
+ .RB_MIN_V_BLANK = 460, // Min
+ .RB_V_FPORCH = 3, // Fixed
+ .REFRESH_MULTIPLIER = 1,// Fixed
+};
+
+static const CVTConsts cvt_consts_v2 =
+{
+ .CLOCK_STEP = 0.001, // Fixed
+ .MIN_V_BPORCH = 6, // Fixed
+ .RB_H_BLANK = 80, // Fixed
+ .RB_H_FPORCH = 8, // Fixed
+ .RB_H_SYNC = 32, // Fixed
+ .RB_H_BPORCH = 40, // Fixed
+ .RB_MIN_V_BLANK = 460, // Min
+ .RB_V_FPORCH = 1, // Min
+ .REFRESH_MULTIPLIER = 1,// or 1000/1001
+};
+
+Videomode videomode_from_cvt(uint32_t hact, uint32_t vact, uint32_t refresh, bool ilace, bool reduced_v2, bool video_optimized)
+{
+ CVTConsts c = reduced_v2 ? cvt_consts_v2 : cvt_consts_v1;
+
+ if (video_optimized)
+ c.REFRESH_MULTIPLIER = 1000.0/1001.0;
+
+ bool INT_RQD = ilace;
+
+ float H_PIXELS = hact;
+ float V_LINES = vact;
+ float IP_FREQ_RQD = refresh ? refresh : 60;
+ if (ilace)
+ IP_FREQ_RQD /= 2;
+
+ float V_SYNC_RND;
+
+ if (reduced_v2) {
+ V_SYNC_RND = 8;
+ } else {
+ if (hact * 3 == vact * 4)
+ V_SYNC_RND = 4;
+ else if (hact * 9 == vact * 16)
+ V_SYNC_RND = 5;
+ else if (hact * 10 == vact * 16)
+ V_SYNC_RND = 6;
+ else if (hact == 1280 && (vact == 1024 || vact == 768))
+ V_SYNC_RND = 7;
+ else
+ V_SYNC_RND = 10;
+ }
+
+ // 5.2.1
+ float V_FIELD_RATE_RQD = INT_RQD ? IP_FREQ_RQD * 2 : IP_FREQ_RQD;
+
+ // 5.2.2
+ float H_PIXELS_RND = floor(H_PIXELS / CELL_GRAN_RND) * CELL_GRAN_RND;
+
+ // 5.2.3
+ float LEFT_MARGIN = 0;
+ float RIGHT_MARGIN = 0;
+
+ // 5.2.4
+ float TOTAL_ACTIVE_PIXELS = H_PIXELS_RND + LEFT_MARGIN + RIGHT_MARGIN;
+
+ // 5.2.5
+ float V_LINES_RND = INT_RQD ? floor(V_LINES / 2) : floor(V_LINES);
+
+ // 5.2.6
+ float TOP_MARGIN = 0;
+ float BOT_MARGIN = 0;
+
+ // 5.2.7
+ float INTERLACE = INT_RQD ? 0.5 : 0;
+
+ // 5.4.8
+ float H_PERIOD_EST = ((1000000 / V_FIELD_RATE_RQD) - c.RB_MIN_V_BLANK) / (V_LINES_RND + TOP_MARGIN + BOT_MARGIN);
+
+ // 5.4.9
+ float VBI_LINES = floor(c.RB_MIN_V_BLANK / H_PERIOD_EST) + 1;
+
+ // 5.4.10
+ float RB_MIN_VBI = c.RB_V_FPORCH + V_SYNC_RND + c.MIN_V_BPORCH;
+ float ACT_VBI_LINES = VBI_LINES < RB_MIN_VBI ? RB_MIN_VBI : VBI_LINES;
+
+ // 5.4.11
+ float TOTAL_V_LINES = ACT_VBI_LINES + V_LINES_RND + TOP_MARGIN + BOT_MARGIN + INTERLACE;
+
+ // 5.4.12
+ float TOTAL_PIXELS = c.RB_H_BLANK + TOTAL_ACTIVE_PIXELS;
+
+ // 5.4.13
+ float ACT_PIXEL_FREQ = c.CLOCK_STEP * floor((V_FIELD_RATE_RQD * TOTAL_V_LINES * TOTAL_PIXELS / 1000000 * c.REFRESH_MULTIPLIER) / c.CLOCK_STEP);
+
+ // 5.4.14
+ //float ACT_H_FREQ = 1000 * ACT_PIXEL_FREQ / TOTAL_PIXELS;
+
+ // 5.4.15
+ //float ACT_FIELD_RATE = 1000 * ACT_H_FREQ / TOTAL_V_LINES;
+
+ // 5.4.16
+ //float ACT_FRAME_RATE = INT_RQD ? ACT_FIELD_RATE / 2 : ACT_FIELD_RATE;
+
+ // 3.4.3.7 Adjust vfp
+ if (reduced_v2)
+ c.RB_V_FPORCH = ACT_VBI_LINES - V_SYNC_RND - c.MIN_V_BPORCH;
+
+ Videomode mode;
+
+ mode = videomode_from_timings(ACT_PIXEL_FREQ * 1000,
+ H_PIXELS_RND, c.RB_H_FPORCH, c.RB_H_SYNC, c.RB_H_BPORCH,
+ V_LINES_RND * (INT_RQD ? 2 : 1), c.RB_V_FPORCH, V_SYNC_RND, ACT_VBI_LINES - V_SYNC_RND - c.RB_V_FPORCH);
+
+ mode.set_hsync(SyncPolarity::Positive);
+ mode.set_vsync(SyncPolarity::Negative);
+
+ mode.set_interlace(INT_RQD);
+
+ return mode;
+}
+
+}