initial commit, basic platform and rendering code.

1 files changed, 97 insertions, 0 deletions

diff --git a/render.c b/render.c
new file mode 100644
index 0000000..34416c0
--- /dev/null
+++ b/render.c
@@ -0,0 +1,97 @@
+#include "rect.h"
+#include "render.h"
+
+static int smol_font_w = 384;
+static unsigned smol_font_data[] = {
+	0x2296a520, 0x40000524, 0x77757767, 0x60002077,
+	0x6773637e, 0x69b15475, 0x95576767, 0x02616755,
+	0x66640102, 0x00021421, 0x00020000, 0xf0326000,
+	0x2543e520, 0x20002242, 0x41152645, 0x92740277,
+	0x1135175d, 0x9bf13427, 0x95523595, 0x05422272,
+	0x72d66364, 0x73f25003, 0x95576677, 0xfa6233a9,
+	0x06267000, 0x20727542, 0x27674145, 0x44022045,
+	0x53151571, 0x9d915525, 0xf55243d7, 0x00422122,
+	0x47351550, 0x55d23425, 0xb5522277, 0xf5222266,
+	0x0b935020, 0x12022024, 0x277437e7, 0x42742277,
+	0x61736756, 0x69975775, 0xb27235e1, 0x70646725,
+	0x32666370, 0x75945625, 0xf2763241, 0xf0326639
+};
+
+void ren_begin(Renderer* r, unsigned* t, int w, int h) {
+	r->t = t;
+	r->w = w;
+	r->h = h;
+	r->clip[0] = 0;
+	r->clip[1] = 0;
+	r->clip[2] = w;
+	r->clip[3] = h;
+}
+
+void ren_end(Renderer* r) {
+	(void)r;
+}
+
+void ren_clear(Renderer* r) {
+	int e = r->w * r->h >> 5, i;
+	for (i = 0; i < e; i++)
+		r->t[i] = 0;
+}
+
+void ren_char(Renderer* r, int x, int y, char ch) {
+	Rect re, su;
+	int i, j, sx, sy, ex, ey;
+	re.x = x;
+	re.y = y;
+	re.w = 4;
+	re.h = 4;
+	su.x = (ch - ' ') * 4;
+	su.y = 0;
+	su.w = 4;
+	su.h = 4;
+	rect_clipsr(&re, &su, r->clip);
+	ex = re.x + re.w;
+	ey = re.y + re.h;
+	for (j = re.y, sy = su.y; j < ey; j++, sy++) {
+		for (i = re.x, sx = su.x; i < ex; i++, sx++) {
+			int di = (i + j * r->w);
+			int si = (sx + sy * smol_font_w);
+			int bit = (1 << (si & 0x1f));
+			bit &= smol_font_data[si >> 5];
+			r->t[di >> 5] ^= (1 << (di & 0x1f)) * (bit != 0);
+		}
+	}
+}
+
+void ren_text(Renderer* r, int x, int y, const char* t) {
+	for (; *t; t++, x += 4)
+		ren_char(r, x, y, *t);
+}
+
+void ren_map(
+	Renderer* r,
+	int x,
+	int y,
+	const Rect* re,
+	const Bitmap* bm
+) {
+	Rect rect, su = *re;
+	const unsigned* data = (const unsigned*)&bm[1];
+	int i, j, sx, sy, ex, ey;
+	rect.x = x;
+	rect.y = y;
+	rect.w = re->w;
+	rect.h = re->h;
+	rect_clipsr(&rect, &su, r->clip);
+	ex = rect.x + rect.w;
+	ey = rect.y + rect.h;
+	for (j = rect.y, sy = su.y; j < ey; j++, sy++) {
+		for (i = rect.x, sx = su.x; i < ex; i++, sx++) {
+			int di = (i + j * r->w);
+			int si = (sx + sy * bm->w);
+			int bit = (1 << (si & 0x1f));
+			bit &= data[si >> 5];
+			r->t[di >> 5] ^= (1 << (di & 0x1f)) * (bit != 0);
+		}
+	}
+}
+