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DOS: horizontal scale test

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This commit is contained in:
Brad Parker 2017-01-21 18:01:30 -05:00
parent c4bfa6b0d2
commit 89fc14d165
1 changed files with 24 additions and 2 deletions
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26
gfx/drivers/vga_gfx.c
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@ -41,6 +41,11 @@ static unsigned vga_video_pitch = 0;
static unsigned vga_video_bits = 0;
static bool vga_rgb32 = false;
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()
{
__dpmi_regs r;
@ -270,11 +275,28 @@ static void vga_set_texture_frame(void *data,
vga_menu_height != height ||
vga_menu_pitch != pitch)
if (pitch && height)
vga_menu_frame = (unsigned char*)malloc(pitch * height);
vga_menu_frame = (unsigned char*)malloc(VGA_WIDTH * VGA_HEIGHT);
if (vga_menu_frame && frame && pitch && height)
{
memcpy(vga_menu_frame, frame, pitch * height);
unsigned x, y;
if (rgb32)
{
}
else
{
unsigned short *video_frame = (unsigned short*)frame;
for(y = 0; y < VGA_HEIGHT; y++)
{
for(x = 0; x < VGA_WIDTH; x++)
{
vga_menu_frame[VGA_WIDTH * y + x] = lerp(0, 65535, 0, 254, video_frame[width * y + x]);
}
}
}
vga_menu_width = width;
vga_menu_height = height;
vga_menu_pitch = pitch;