初始化

clks/drivers/video/framebuffer.c

@@ -0,0 +1,95 @@
+#include <clks/framebuffer.h>
+#include <clks/string.h>
+#include <clks/types.h>
+
+#include "font8x8.h"
+
+struct clks_fb_state {
+    volatile u8 *address;
+    struct clks_framebuffer_info info;
+    clks_bool ready;
+};
+
+static struct clks_fb_state clks_fb = {
+    .address = CLKS_NULL,
+    .info = {0, 0, 0, 0},
+    .ready = CLKS_FALSE,
+};
+
+static void clks_fb_put_pixel(u32 x, u32 y, u32 rgb) {
+    volatile u8 *row;
+    volatile u32 *pixel;
+
+    if (clks_fb.ready == CLKS_FALSE) {
+        return;
+    }
+
+    if (x >= clks_fb.info.width || y >= clks_fb.info.height) {
+        return;
+    }
+
+    if (clks_fb.info.bpp != 32) {
+        return;
+    }
+
+    row = clks_fb.address + ((usize)y * (usize)clks_fb.info.pitch);
+    pixel = (volatile u32 *)(row + ((usize)x * 4));
+    *pixel = rgb;
+}
+
+void clks_fb_init(const struct limine_framebuffer *fb) {
+    if (fb == CLKS_NULL) {
+        clks_fb.ready = CLKS_FALSE;
+        return;
+    }
+
+    clks_fb.address = (volatile u8 *)fb->address;
+    clks_fb.info.width = (u32)fb->width;
+    clks_fb.info.height = (u32)fb->height;
+    clks_fb.info.pitch = (u32)fb->pitch;
+    clks_fb.info.bpp = fb->bpp;
+    clks_fb.ready = CLKS_TRUE;
+}
+
+clks_bool clks_fb_ready(void) {
+    return clks_fb.ready;
+}
+
+struct clks_framebuffer_info clks_fb_info(void) {
+    return clks_fb.info;
+}
+
+void clks_fb_clear(u32 rgb) {
+    u32 x;
+    u32 y;
+
+    if (clks_fb.ready == CLKS_FALSE) {
+        return;
+    }
+
+    for (y = 0; y < clks_fb.info.height; y++) {
+        for (x = 0; x < clks_fb.info.width; x++) {
+            clks_fb_put_pixel(x, y, rgb);
+        }
+    }
+}
+
+void clks_fb_draw_char(u32 x, u32 y, char ch, u32 fg_rgb, u32 bg_rgb) {
+    const u8 *glyph;
+    u32 row;
+    u32 col;
+
+    if (clks_fb.ready == CLKS_FALSE) {
+        return;
+    }
+
+    glyph = clks_font8x8_get(ch);
+
+    for (row = 0; row < 8; row++) {
+        for (col = 0; col < 8; col++) {
+            u8 mask = (u8)(1U << (7U - col));
+            u32 color = (glyph[row] & mask) != 0 ? fg_rgb : bg_rgb;
+            clks_fb_put_pixel(x + col, y + row, color);
+        }
+    }
+}