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Added VGA grayscale and choose screen type

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VGA render can transform to grayscale and applying color.
Green, amber and white.
This commit is contained in:
basic2004
2017-07-17 23:04:50 +09:00
committed by GitHub
parent f8229f6cbd
commit ccea4a189a
6 changed files with 93 additions and 8 deletions
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61
src/VIDEO/vid_svga_render.c
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@@ -17,6 +17,7 @@
*/
#include <stdio.h>
#include <math.h>
#include "../ibm.h"
#include "../mem.h"
#include "video.h"
@@ -25,21 +26,69 @@
int invert_display = 0;
int video_grayscale = 0;
uint32_t svga_color_transform(uint32_t color)
{
uint32_t temp = 0;
temp = color;
if (video_grayscale != 0)
{
temp = ((77 * (color & 0xff0000)) >> 24) + ((150 * (color & 0xff00)) >> 16) + ((29 * (color & 0xff)) >> 8);
if (temp > 0xff)
temp = 0xff;
float temp_r = 0;
float temp_g = 0;
float temp_b = 0;
temp_r = temp_g = temp_b = ((float)temp) / 256;
switch (video_grayscale)
{
case 2:
temp_r = pow(temp_r, 0.6);
temp_g = 0.9 * pow(temp_g, 2);
temp_b = 0.2 * pow(temp_b, 6);
break;
case 3:
temp_r = 0.225 * pow(temp_r, 4);
temp_g = pow(temp_g, 0.75);
temp_b = 0.375 * pow(temp_b, 2);
break;
case 4:
temp_r = pow(temp_r, 1.05);
temp_g = 0.99 * temp_g;
temp_b = 0.925 * pow(temp_b, 0.9);
break;
}
if (temp_r >= 1)
temp = 0xff0000;
else if (temp_r <= 0)
temp = 0x000000;
else
temp = (int)(temp_r * 256) << 16;
if (temp_g >= 1)
temp |= 0x00ff00;
else if (temp_g <= 0)
temp &= 0xff00ff;
else
temp = temp + ((int)(temp_g * 256) << 8);
if (temp_b >= 1)
temp |= 0x0000ff;
else if (temp_b <= 0)
temp &= 0xffff00;
else
temp = temp + (int)(temp_b * 256);
color = temp;
}
if (invert_display)
{
temp |= (0xff - (color & 0xff));
temp = (0xff - (color & 0xff));
temp |= (0xff00 - (color & 0xff00));
temp |= (0xff0000 - (color & 0xff0000));
}
else
{
temp = color;
}
return temp;
}