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authorJuan J. Martinez <jjm@usebox.net>2023-06-06 22:58:48 +0100
committerJuan J. Martinez <jjm@usebox.net>2023-06-06 22:58:48 +0100
commit1c1e91bd8bf4e9d08cd4d8ee41568e3d25ee8256 (patch)
tree9f556e4cf692f83938ec772342b4cd6bb89323d8
parent960db500527928e88bfb3787c9861a8b09f44749 (diff)
downloadgold-mine-run-1c1e91bd8bf4e9d08cd4d8ee41568e3d25ee8256.tar.gz
gold-mine-run-1c1e91bd8bf4e9d08cd4d8ee41568e3d25ee8256.zip
First stab at the sw blitter
-rw-r--r--data/sprites.pngbin345 -> 9174 bytes
-rw-r--r--src/main.c45
-rw-r--r--src/vga.c42
-rw-r--r--src/vga.h9
4 files changed, 82 insertions, 14 deletions
diff --git a/data/sprites.png b/data/sprites.png
index bfe73d4..6ca0043 100644
--- a/data/sprites.png
+++ b/data/sprites.png
Binary files differ
diff --git a/src/main.c b/src/main.c
index 9876404..89ae860 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,7 @@
#include <stdint.h>
-#include <stdio.h>
#include <string.h>
#include <stdlib.h>
+#include <stdio.h>
#include <crt0.h>
#include "keyb.h"
@@ -29,25 +29,50 @@ int main(int argc, char *argv[])
set_palette(binary_palette_start);
- uint8_t *screen = open_framebuffer();
- if (!screen)
+ if (!open_framebuffer())
{
set_mode(3);
fprintf(stderr, "ERROR: failed to open the framebuffer\n");
return 1;
}
- int i = 0;
+ blit_erase(0);
+
+ uint8_t bg[24 * 24] = { 0 };
+ uint16_t x = 10, y = 10;
+ int8_t ix = 1, iy = 1;
+ uint8_t c = 0;
+
while (!keys[KEY_ESC])
{
- wait_vsync();
+ // erase
+ blit(bg, x, y, 24, 24);
- memset(screen, i, 320 * 200);
- i++;
- if (i > 15)
- i = 0;
+ x += ix;
+ y += iy;
+
+ if (x >= 320 - 24 || x == 0)
+ {
+ ix *= -1;
+ c = (c + 1) % 15;
+ blit_erase(c);
+ memset(bg, c, 24 * 24);
+ }
+ if (y >= 200 - 24 || y == 0)
+ {
+ iy *= -1;
+ c = (c + 1) % 15;
+ blit_erase(c);
+ memset(bg, c, 24 * 24);
+ }
+
+ // draw
+ blit(binary_sprites_start, x, y, 24, 24);
+
+ wait_vsync();
+ blit_update();
- timer_wait(1);
+ //timer_wait(1);
}
set_mode(3);
diff --git a/src/vga.c b/src/vga.c
index 981ad6f..e2fb7f9 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -1,15 +1,22 @@
#include <stdlib.h>
+#include <string.h>
#include <stdint.h>
#include <dpmi.h>
#include <sys/nearptr.h>
#include <pc.h>
-uint8_t *open_framebuffer()
+#include "vga.h"
+
+static uint8_t buffer[320 * 200];
+static uint8_t *screen = NULL;
+
+uint8_t open_framebuffer()
{
if (__djgpp_nearptr_enable() == 0)
- return NULL;
+ return 0;
- return (uint8_t *)(0xa0000 + __djgpp_conventional_base);
+ screen = (uint8_t *)(0xa0000 + __djgpp_conventional_base);
+ return 1;
}
void close_framebuffer()
@@ -36,3 +43,32 @@ void set_palette(const uint8_t *palette)
for (int i = 0; i < 768; i++)
outportb(0x3c9, palette[i] >> 2);
}
+
+void blit(const uint8_t *src, uint16_t x, uint16_t y, uint16_t w, uint16_t h)
+{
+ for (int32_t j = y; j < y + h; j++)
+ for (int32_t i = x; i < x + w; i++)
+ {
+ uint8_t b = *src++;
+
+ /* transparent */
+ if (b == TRANSPARENT)
+ continue;
+
+ /* clipping */
+ if (i < 0 || i >= 320 || j < 0 || j >= 200)
+ continue;
+
+ buffer[i + j * 320] = b;
+ }
+}
+
+void blit_erase(uint8_t c)
+{
+ memset(buffer, c, 320 * 200);
+}
+
+void blit_update()
+{
+ memcpy(screen, buffer, 320 * 200);
+}
diff --git a/src/vga.h b/src/vga.h
index be90b29..ef183ca 100644
--- a/src/vga.h
+++ b/src/vga.h
@@ -1,7 +1,10 @@
#ifndef _VGA_H
#define _VGA_H
-uint8_t *open_framebuffer();
+/* palette index to be used as transparent color */
+#define TRANSPARENT 16
+
+uint8_t open_framebuffer();
void close_framebuffer();
void set_mode(uint8_t mode);
@@ -10,4 +13,8 @@ void wait_vsync();
/* the palette is expected to be 8 bit per color, and will be converted to VGA's 6 bit per color */
void set_palette(const uint8_t *palette);
+void blit(const uint8_t *src, uint16_t x, uint16_t y, uint16_t w, uint16_t h);
+void blit_erase(uint8_t c);
+void blit_update();
+
#endif /* _VGA_H */