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DOS: use custom VGA color palette, rgui looks nice but still is not green

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This commit is contained in:
Brad Parker 2017-01-21 23:46:04 -05:00
parent 89fc14d165
commit 5c83e993ba
1 changed files with 44 additions and 7 deletions
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51
gfx/drivers/vga_gfx.c
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@ -46,7 +46,7 @@ static float lerp(float x, float y, float a, float b, float d)
return a + (b - a) * ((d - x) / (y - x));
}
static void set_mode_13h()
static void vga_set_mode_13h()
{
__dpmi_regs r;
@ -54,7 +54,7 @@ static void set_mode_13h()
__dpmi_int(0x10, &r);
}
static void return_to_text_mode()
static void vga_return_to_text_mode()
{
__dpmi_regs r;
@ -62,24 +62,57 @@ static void return_to_text_mode()
__dpmi_int(0x10, &r);
}
static void vga_upload_palette()
{
unsigned i;
unsigned char r = 0;
unsigned char g = 0;
unsigned char b = 0;
outp(0x03c8, 0);
/* RGB332 */
for (i = 0; i < 256; i++)
{
outp(0x03c9, i * r * (63.0f / 255.0f));
outp(0x03c9, i * g * (63.0f / 255.0f));
outp(0x03c9, i * b * (63.0f / 255.0f));
r++;
if (i % 64 == 0)
{
r = 0;
g = 0;
b++;
}
else if (i % 8 == 0)
{
r = 0;
g++;
}
}
}
static void vga_vsync()
{
/* wait until any previous retrace has ended */
do
{
}
while (inportb(0x3DA) & 8);
while (inportb(0x3da) & 8);
/* wait until a new retrace has just begun */
do
{
}
while (!(inportb(0x3DA) & 8));
while (!(inportb(0x3da) & 8));
}
static void vga_gfx_create(void)
{
set_mode_13h();
vga_set_mode_13h();
vga_upload_palette();
}
static void *vga_gfx_init(const video_info_t *video,
@ -220,7 +253,7 @@ static void vga_gfx_free(void *data)
vga_menu_frame = NULL;
}
return_to_text_mode();
vga_return_to_text_mode();
}
static bool vga_gfx_set_shader(void *data,
@ -292,7 +325,11 @@ static void vga_set_texture_frame(void *data,
{
for(x = 0; x < VGA_WIDTH; x++)
{
vga_menu_frame[VGA_WIDTH * y + x] = lerp(0, 65535, 0, 254, video_frame[width * y + x]);
unsigned short pixel = video_frame[width * y + x];
unsigned r = (7.0f / 15.0f) * ((pixel & 0xF) >> 0);
unsigned g = (7.0f / 15.0f) * ((pixel & 0xF0) >> 4);
unsigned b = (3.0f / 15.0f) * ((pixel & 0xF00) >> 8);
vga_menu_frame[VGA_WIDTH * y + x] = (b << 6) | (g << 3) | r;
}
}
}