Nyaaori/gamescope
1
0
Fork 0
Code Issues Pull requests Projects Releases 1 Packages Wiki Activity
gamescope/src/modegen.cpp

425 lines
13 KiB
C++
Raw Permalink Blame History

/*
* Copyright 2005-2006 Luc Verhaegen.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "modegen.hpp"
/* top/bottom margin size (% of height) - default: 1.8 */
#define CVT_MARGIN_PERCENTAGE 1.8
/* character cell horizontal granularity (pixels) - default 8 */
#define CVT_H_GRANULARITY 8
/* Minimum vertical porch (lines) - default 3 */
#define CVT_MIN_V_PORCH 3
/* Minimum number of vertical back porch lines - default 6 */
#define CVT_MIN_V_BPORCH 6
/* Pixel clock step (kHz) */
#define CVT_CLOCK_STEP 250
/* Minimum time of vertical sync + back porch interval (µs)
* default 550.0 */
#define CVT_MIN_VSYNC_BP 550.0
/* Nominal hsync width (% of line period) - default 8 */
#define CVT_HSYNC_PERCENTAGE 8
/* Definition of Horizontal blanking time limitation */
/* Gradient (%/kHz) - default 600 */
#define CVT_M_FACTOR 600
/* Offset (%) - default 40 */
#define CVT_C_FACTOR 40
/* Blanking time scaling factor - default 128 */
#define CVT_K_FACTOR 128
/* Scaling factor weighting - default 20 */
#define CVT_J_FACTOR 20
#define CVT_M_PRIME CVT_M_FACTOR * CVT_K_FACTOR / 256
#define CVT_C_PRIME (CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
CVT_J_FACTOR
/* Minimum vertical blanking interval time (µs) - default 460 */
#define CVT_RB_MIN_VBLANK 460.0
/* Fixed number of clocks for horizontal sync */
#define CVT_RB_H_SYNC 32.0
/* Fixed number of clocks for horizontal blanking */
#define CVT_RB_H_BLANK 160.0
/* Fixed number of lines for vertical front porch - default 3 */
#define CVT_RB_VFPORCH 3
/*
* Generate a CVT standard mode from hdisplay, vdisplay and vrefresh.
*
* These calculations are stolen from the CVT calculation spreadsheet written
* by Graham Loveridge. He seems to be claiming no copyright and there seems to
* be no license attached to this. He apparently just wants to see his name
* mentioned.
*
* This file can be found at http://www.vesa.org/Public/CVT/CVTd6r1.xls
*
* Comments and structure corresponds to the comments and structure of the xls.
* This should ease importing of future changes to the standard (not very
* likely though).
*
* This function is borrowed from xorg-xserver's xf86CVTmode.
*/
void generate_cvt_mode(drmModeModeInfo *mode, int hdisplay, int vdisplay,
float vrefresh, bool reduced, bool interlaced) {
bool margins = false;
float vfield_rate, hperiod;
int hdisplay_rnd, hmargin;
int vdisplay_rnd, vmargin, vsync;
float interlace; /* Please rename this */
/* CVT default is 60.0Hz */
if (!vrefresh) {
vrefresh = 60.0;
}
/* 1. Required field rate */
if (interlaced) {
vfield_rate = vrefresh * 2;
} else {
vfield_rate = vrefresh;
}
/* 2. Horizontal pixels */
hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
/* 3. Determine left and right borders */
if (margins) {
/* right margin is actually exactly the same as left */
hmargin = (((float) hdisplay_rnd) * CVT_MARGIN_PERCENTAGE / 100.0);
hmargin -= hmargin % CVT_H_GRANULARITY;
} else {
hmargin = 0;
}
/* 4. Find total active pixels */
mode->hdisplay = hdisplay_rnd + 2 * hmargin;
/* 5. Find number of lines per field */
if (interlaced) {
vdisplay_rnd = vdisplay / 2;
} else {
vdisplay_rnd = vdisplay;
}
/* 6. Find top and bottom margins */
/* nope. */
if (margins) {
/* top and bottom margins are equal again. */
vmargin = (((float) vdisplay_rnd) * CVT_MARGIN_PERCENTAGE / 100.0);
} else {
vmargin = 0;
}
mode->vdisplay = vdisplay + 2 * vmargin;
/* 7. interlace */
if (interlaced) {
interlace = 0.5;
} else {
interlace = 0.0;
}
/* Determine vsync Width from aspect ratio */
if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay)) {
vsync = 4;
} else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay)) {
vsync = 5;
} else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay)) {
vsync = 6;
} else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay)) {
vsync = 7;
} else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay)) {
vsync = 7;
} else { /* Custom */
vsync = 10;
}
if (!reduced) { /* simplified GTF calculation */
float hblank_percentage;
int vsync_and_back_porch, vblank_porch;
int hblank;
/* 8. Estimated Horizontal period */
hperiod = ((float) (1000000.0 / vfield_rate - CVT_MIN_VSYNC_BP)) /
(vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH + interlace);
/* 9. Find number of lines in sync + backporch */
if (((int) (CVT_MIN_VSYNC_BP / hperiod) + 1) <
(vsync + CVT_MIN_V_PORCH)) {
vsync_and_back_porch = vsync + CVT_MIN_V_PORCH;
} else {
vsync_and_back_porch = (int) (CVT_MIN_VSYNC_BP / hperiod) + 1;
}
/* 10. Find number of lines in back porch */
vblank_porch = vsync_and_back_porch - vsync;
(void) vblank_porch;
/* 11. Find total number of lines in vertical field */
mode->vtotal = vdisplay_rnd + 2 * vmargin + vsync_and_back_porch + interlace
+ CVT_MIN_V_PORCH;
/* 12. Find ideal blanking duty cycle from formula */
hblank_percentage = CVT_C_PRIME - CVT_M_PRIME * hperiod / 1000.0;
/* 13. Blanking time */
if (hblank_percentage < 20) {
hblank_percentage = 20;
}
hblank = mode->hdisplay * hblank_percentage / (100.0 - hblank_percentage);
hblank -= hblank % (2 * CVT_H_GRANULARITY);
/* 14. Find total number of pixels in a line. */
mode->htotal = mode->hdisplay + hblank;
/* Fill in hsync values */
mode->hsync_end = mode->hdisplay + hblank / 2;
mode->hsync_start = mode->hsync_end -
(mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
mode->hsync_start += CVT_H_GRANULARITY -
mode->hsync_start % CVT_H_GRANULARITY;
/* Fill in vsync values */
mode->vsync_start = mode->vdisplay + CVT_MIN_V_PORCH;
mode->vsync_end = mode->vsync_start + vsync;
} else { /* reduced blanking */
int vbi_lines;
/* 8. Estimate Horizontal period. */
hperiod = ((float) (1000000.0 / vfield_rate - CVT_RB_MIN_VBLANK)) /
(vdisplay_rnd + 2 * vmargin);
/* 9. Find number of lines in vertical blanking */
vbi_lines = ((float) CVT_RB_MIN_VBLANK) / hperiod + 1;
/* 10. Check if vertical blanking is sufficient */
if (vbi_lines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH)) {
vbi_lines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
}
/* 11. Find total number of lines in vertical field */
mode->vtotal = vdisplay_rnd + 2 * vmargin + interlace + vbi_lines;
/* 12. Find total number of pixels in a line */
mode->htotal = mode->hdisplay + CVT_RB_H_BLANK;
/* Fill in hsync values */
mode->hsync_end = mode->hdisplay + CVT_RB_H_BLANK / 2;
mode->hsync_start = mode->hsync_end - CVT_RB_H_SYNC;
/* Fill in vsync values */
mode->vsync_start = mode->vdisplay + CVT_RB_VFPORCH;
mode->vsync_end = mode->vsync_start + vsync;
}
/* 15/13. Find pixel clock frequency (kHz for xf86) */
mode->clock = mode->htotal * 1000.0 / hperiod;
mode->clock -= mode->clock % CVT_CLOCK_STEP;
/* 17/15. Find actual Field rate */
mode->vrefresh = (1000.0 * ((float) mode->clock)) /
((float) (mode->htotal * mode->vtotal));
/* 18/16. Find actual vertical frame frequency */
/* ignore - just set the mode flag for interlaced */
if (interlaced) {
mode->vtotal *= 2;
mode->flags |= DRM_MODE_FLAG_INTERLACE;
}
snprintf(mode->name, sizeof(mode->name), "%dx%d", hdisplay, vdisplay);
if (reduced) {
mode->flags |= DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
} else {
mode->flags |= DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
}
}
// galielo SDC rev B ds.10 spec'd rates
// fps 45 48 51 55 60 65 72 80 90
// VFP 1321 1157 993 829 665 501 337 173 9
// galielo BOE spec'd rates
// fps 45 48 51 55 60 65 72 80 90
// VFP 1320 1156 992 828 664 500 336 172 8
// SDC VFP values for 40 Hz to 120 Hz, Untested
unsigned int galileo_sdc_vfp[] =
{
1321,1321,1321,1321,1321,1321,1264,1209,1157,1106,
1058,1012, 967, 925, 883, 844, 805, 768, 732, 698,
665, 632, 601, 571, 542, 513, 486, 459, 433, 408,
383, 360, 337, 314, 292, 271, 250, 230, 210, 191,
173, 154, 137, 119, 102, 86, 70, 54, 38, 23,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9
};
// SDC pixel clock values for 40 to 120 Hz, Untested
// Unlikely to function over ~100Hz due to bandwidth limitations
unsigned int galileo_sdc_clock[] =
{
118400,121360,124320,127280,130240,133200,133200,133200,133200,133200,
133200,133200,133200,133200,133200,133200,133200,133200,133200,133200,
133200,133200,133200,133200,133200,133200,133200,133200,133200,133200,
133200,133200,133200,133200,133200,133200,133200,133200,133200,133200,
133200,133200,133200,133200,133200,133200,133200,133200,133200,133200,
133200,134680,136160,137640,139120,140600,142080,143560,145040,146520,
148000,149480,150960,152440,153920,155400,156880,158360,159840,161320,
162800,164280,165760,167240,168720,170200,171680,173160,174640,176120,
177160
};
// BOE VFP values for 40 Hz to 120 Hz
// BOE Vtotal must be a multiple of 4
unsigned int galileo_boe_vfp[] =
{
1320,1320,1216,1216,1216,1216,1320,1320,1216,1112,
1112, 992, 928, 992, 992, 828, 808, 700, 808, 664,
700, 664, 664, 604, 544, 544, 500, 436, 488, 436,
336, 316, 336, 316, 228, 336, 316, 252, 252, 212,
100, 84, 172, 136, 68, 36, 84, 52, 36, 68,
84, 36, 136, 52, 36, 52, 52, 8, 152, 68,
100, 8, 136, 36, 84, 8, 36, 8, 84, 8,
172, 68, 8, 8, 52, 36, 68, 8, 36, 100,
100
};
// BOE pixel clock values for 40 to 120 Hz
unsigned int galileo_boe_clock[] =
{
90340, 92590, 91100, 93270, 95440, 97610,103880,106140,104120,101910,
103990,100820, 99940,104780,106750,100990,101870, 98400,105500,100030,
103580,103420,105120,103570,101920,103510,102610,100490,105020,103490,
98980, 99180,101810,101970, 97780,106050,106160,103330,104670,103300,
96920, 97020,104410,103120, 99460, 98310,103010,101820,101780,105380,
107800,105250,114300,108840,108720,111180,112350,109860,123100,117220,
121150,114390,126730,119130,124570,118920,122600,121190,129360,123450,
140060,131430,126850,127980,133420,133010,137350,132510,136480,144170,
145380
};
#define GALILEO_MIN_REFRESH 40
#define GALILEO_SDC_PID 0x3003
#define GALILEO_SDC_VSYNC 1
#define GALILEO_SDC_VBP 22
#define GALILEO_BOE_PID 0x3004
#define GALILEO_BOE_VSYNC 2
#define GALILEO_BOE_VBP 30
#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
unsigned int get_galileo_vfp( int vrefresh, unsigned int * vfp_array, unsigned int num_rates )
{
for ( unsigned int i = 0; i < num_rates; i++ ) {
if ( i+GALILEO_MIN_REFRESH == (unsigned int)vrefresh ) {
return vfp_array[i];
}
}
return 0;
}
unsigned int get_galileo_clock( int vrefresh, unsigned int * clock_array, unsigned int num_rates )
{
for ( unsigned int i = 0; i < num_rates; i++ ) {
if ( i+GALILEO_MIN_REFRESH == (unsigned int)vrefresh ) {
return clock_array[i];
}
}
return 0;
}
void generate_fixed_mode(drmModeModeInfo *mode, const drmModeModeInfo *base, int vrefresh,
bool use_tuned_clocks, unsigned int use_vfp )
{
*mode = *base;
if (!vrefresh)
vrefresh = 60;
if ( use_vfp ) {
unsigned int clock, vfp, vsync, vbp = 0;
if (GALILEO_SDC_PID == use_vfp) {
vfp = get_galileo_vfp( vrefresh, galileo_sdc_vfp, ARRAY_SIZE(galileo_sdc_vfp) );
clock = get_galileo_clock( vrefresh, galileo_sdc_clock, ARRAY_SIZE(galileo_sdc_clock) );
// if we did not find a matching rate then we default to 60 Hz
if ( !vfp ) {
vrefresh = 60;
vfp = 665;
clock = 133200;
}
vsync = GALILEO_SDC_VSYNC;
vbp = GALILEO_SDC_VBP;
} else { // BOE Panel
vfp = get_galileo_vfp( vrefresh, galileo_boe_vfp, ARRAY_SIZE(galileo_boe_vfp) );
clock = get_galileo_clock( vrefresh, galileo_boe_clock, ARRAY_SIZE(galileo_boe_clock) );
// if we did not find a matching rate then we default to 60 Hz
if ( !vfp ) {
vrefresh = 60;
vfp = 700;
clock = 103580;
}
vsync = GALILEO_BOE_VSYNC;
vbp = GALILEO_BOE_VBP;
}
mode->clock = clock;
mode->vsync_start = mode->vdisplay + vfp;
mode->vsync_end = mode->vsync_start + vsync;
mode->vtotal = mode->vsync_end + vbp;
} else {
if ( use_tuned_clocks )
{
mode->hdisplay = 800;
mode->hsync_start = 840;
mode->hsync_end = 844;
mode->htotal = 884;
mode->vdisplay = 1280;
mode->vsync_start = 1310;
mode->vsync_end = 1314;
mode->vtotal = 1322;
}
mode->clock = ( ( mode->htotal * mode->vtotal * vrefresh ) + 999 ) / 1000;
}
mode->vrefresh = (1000 * mode->clock) / (mode->htotal * mode->vtotal);
snprintf(mode->name, sizeof(mode->name), "%dx%d@%d.00", mode->hdisplay, mode->vdisplay, vrefresh);
}
Reference in a new issue View git blame Copy permalink