# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1403061607 -10800
# Node ID 158d23956801a53e30137b03a586aa7e27711acd
# Parent  73b5f2e5d18a0a8d3550efedc871c076ab90def1
started adding rendering pipeline stuff

diff -r 73b5f2e5d18a -r 158d23956801 src/fixed.h
--- a/src/fixed.h	Wed Jun 18 04:13:02 2014 +0300
+++ b/src/fixed.h	Wed Jun 18 06:20:07 2014 +0300
@@ -3,6 +3,12 @@
 
 #include <stdint.h>
 
+#define ftox16(x)		(int32_t)((x) * 65536.0f)
+#define itox16(x)		(int32_t)((x) << 16)
+
+#define x16tof(x)		(float)((x) / 65536.0f)
+#define x16toi(x)		((x) >> 16)
+
 #define x16mul(a, b)	(int32_t)(((int32_t)(a) >> 8) * ((int32_t)(b) >> 8))
 /*int32_t x16div(register int32_t num, register int32_t denom);*/
 
diff -r 73b5f2e5d18a -r 158d23956801 src/x3d.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/x3d.c	Wed Jun 18 06:20:07 2014 +0300
@@ -0,0 +1,84 @@
+#include <string.h>
+#include "x3d.h"
+#include "fixed.h"
+#include "sincos.h"
+
+#define MAT_STACK_SIZE	4
+
+struct matrix {
+	int32_t m[3][4];
+};
+
+static int32_t proj_fov = M_PI_X16;
+static int32_t proj_aspect = 65536;
+static int32_t proj_near = ftox16(0.5);
+static int32_t proj_far = 500 << 16;
+
+static struct matrix identity = {
+	{{65536, 0, 0, 0}, {0, 65536, 0, 0}, {0, 0, 65536, 0}}
+};
+
+static short mtop;
+static struct matrix mstack[MAT_STACK_SIZE] = {
+	{{{65536, 0, 0, 0}, {0, 65536, 0, 0}, {0, 0, 65536, 0}}},
+	{{{65536, 0, 0, 0}, {0, 65536, 0, 0}, {0, 0, 65536, 0}}}
+};
+
+void x3d_projection(int32_t fov, int32_t aspect, int32_t nearz, int32_t farz)
+{
+	proj_fov = fov;
+	proj_aspect = aspect;
+	proj_near = nearz;
+	proj_far = farz;
+}
+
+int x3d_push_matrix(void)
+{
+	short newtop = mtop + 1;
+	if(newtop >= MAT_STACK_SIZE) {
+		return -1;
+	}
+	memcpy(mstack + newtop, mstack + mtop, sizeof *mstack);
+	mtop = newtop;
+	return 0;
+}
+
+int x3d_pop_matrix(void)
+{
+	if(mtop <= 0) {
+		return -1;
+	}
+	--mtop;
+	return 0;
+}
+
+void x3d_load_matrix(int32_t *m)
+{
+	memcpy(mstack[mtop].m[0], m, sizeof *mstack);
+}
+
+
+#define M(i,j)	(((i) << 2) + (j))
+void x3d_mult_matrix(int32_t *m)
+{
+	int i, j;
+	struct matrix tmp;
+
+	memcpy(tmp.m[0], mstack[mtop].m[0], sizeof tmp);
+
+	for(i=0; i<3; i++) {
+		for(j=0; j<4; j++) {
+			mstack[mtop].m[i][j] = x16mul(tmp.m[0][j], m[M(i, 0)]) +
+				x16mul(tmp.m[1][j], m[M(i, 1)]) +
+				x16mul(tmp.m[2][j], m[M(i, 2)]) +
+				m[M(i, 3)];
+		}
+	}
+}
+
+void x3d_load_identity(void)
+{
+	memcpy(mstack[mtop].m[0], identity.m[0], sizeof identity);
+}
+
+/* TODO cont... */
diff -r 73b5f2e5d18a -r 158d23956801 src/x3d.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/x3d.h	Wed Jun 18 06:20:07 2014 +0300
@@ -0,0 +1,28 @@
+#ifndef X3D_H_
+#define X3D_H_
+
+#include <stdint.h>
+
+enum {
+	X3D_POINTS = 1,
+	X3D_LINES = 2,
+	X3D_TRIANGLES = 3,
+	X3D_QUADS = 4
+};
+
+void x3d_projection(int32_t fov, int32_t aspect, int32_t nearz, int32_t farz);
+
+int x3d_push_matrix(void);
+int x3d_pop_matrix(void);
+void x3d_load_matrix(int32_t *m);
+void x3d_mult_matrix(int32_t *m);
+void x3d_load_identity(void);
+void x3d_translate(int32_t x, int32_t y, int32_t z);
+void x3d_rotate(int32_t angle, int32_t x, int32_t y, int32_t z);
+void x3d_scale(int32_t x, int32_t y, int32_t z);
+
+void x3d_vertex_array(int count, int32_t *ptr);
+void x3d_color_array(int count, int32_t *ptr);
+int x3d_draw_arrays(int prim);
+
+#endif	/* X3D_H_ */