OBJCOPY = $(ARCH)objcopy
EMU = vbam
-opt = -O1 -fomit-frame-pointer -mcpu=arm7tdmi -mtune=arm7tdmi -mthumb -mthumb-interwork
+opt = -O3 -fomit-frame-pointer -mcpu=arm7tdmi -mtune=arm7tdmi -mthumb -mthumb-interwork
#dbg = -g
CFLAGS = $(opt) $(dbg) -pedantic -Wall -MMD
ASFLAGS = -mthumb-interwork
-LDFLAGS = -mthumb -mthumb-interwork -Wl,-print-gc-sections
+LDFLAGS = -mthumb -mthumb-interwork -lm
EMUFLAGS = -T 100 -f 1 --agb-print
--- /dev/null
+#include <stdio.h>
+#include <stdarg.h>
+#include "debug.h"
+
+__attribute__((target("arm")))
+void emuprint(const char *fmt, ...)
+{
+ char buf[128];
+ va_list arg_list;
+
+ va_start(arg_list, fmt);
+ vsnprintf(buf, 128, fmt, arg_list);
+ va_end(arg_list);
+
+ __asm__ __volatile__(
+ "mov r0, %0\n\t"
+ "swi 0xff0000\n\t" :
+ : "r" (buf)
+ : "r0"
+ );
+}
--- /dev/null
+#ifndef DEBUG_H_
+#define DEBUG_H_
+
+void emuprint(const char *fmt, ...);
+
+#endif /* DEBUG_H_ */
#define wait_vblank() while(REG_VCOUNT < 160)
-#define swap_buffers() \
+#define present(x) \
do { \
- static int vis; \
- vis ^= 0x10; \
- REG_DISPCNT = DISPCNT_BG2 | 4 | vis; \
+ REG_DISPCNT = DISPCNT_BG2 | 4 | ((x) << 4); \
} while(0)
#define set_bg_color(idx, r, g, b) \
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
+#include <stdlib.h>
#include <string.h>
#include "gbaregs.h"
#include "timer.h"
#include "keyb.h"
#include "intr.h"
#include "gfx.h"
+#include "xgl.h"
+#include "polyfill.h"
+#include "debug.h"
+
+#define MENU_HEIGHT 17
+#define TRACK_HEIGHT 18
+#define VP_HEIGHT (160 - MENU_HEIGHT - TRACK_HEIGHT)
static void handle_keys(void);
extern struct { unsigned char r, g, b; } bgimg_cmap[];
extern unsigned char bgimg_pixels[];
+struct xvertex varr[] = {
+ {0, -0xd000},
+ {-0x8000, 0x7000},
+ {0x8000, 0x7000}
+};
+
int main(void)
{
int i;
+ unsigned int nframes = 0, backbuf;
+ unsigned long tm0, tm;
uint16_t *cptr;
unsigned char r, g, b;
+ unsigned char *fbptr[2], *fb;
+ struct pvertex benchv[3] = {
+ {120 << 8, 8 << 8},
+ {75 << 8, 110 << 8},
+ {164 << 8, 80 << 8}
+ };
intr_init();
reset_msec_timer();
/* mode 4: 240x160 8bpp */
REG_DISPCNT = DISPCNT_BG2 | 4;
+ fbptr[0] = (unsigned char*)VRAM_LFB_FB0_ADDR;
+ fbptr[1] = (unsigned char*)VRAM_LFB_FB1_ADDR;
+
+ set_bg_color(0xff, 31, 31, 31);
+
cptr = (uint16_t*)CRAM_BG_ADDR;
for(i=0; i<128; i++) {
r = bgimg_cmap[i].r >> 3;
b = bgimg_cmap[i].b >> 3;
*cptr++ = r | (g << 5) | (b << 10);
}
- memcpy((void*)VRAM_LFB_FB0_ADDR, bgimg_pixels, 240 * 160);
- memcpy((void*)VRAM_LFB_FB1_ADDR, bgimg_pixels, 240 * 160);
+ for(i=0; i<128; i++) {
+ r = (rand() & 0xf) + 8;
+ g = (rand() & 0xf) + 8;
+ b = (rand() & 0xf) + 8;
+ *cptr++ = r | (g << 5) | (b << 10);
+ }
+ memcpy(fbptr[0], bgimg_pixels, 240 * 160);
+ memcpy(fbptr[1], bgimg_pixels, 240 * 160);
+
+ xgl_init();
+ xgl_viewport(0, MENU_HEIGHT, 240, VP_HEIGHT);
+
+ /* benchmark */
+ polyfill_framebuffer(fbptr[0] + 240 * MENU_HEIGHT, 240, VP_HEIGHT);
+ tm0 = timer_msec;
+ for(i=0; i<2048; i++) {
+ polyfill_flat(benchv, 3, 128 + (i & 0x7f));
+ }
+ tm = timer_msec - tm0;
+ emuprint("benchmark: %lu ms\n", tm);
/*key_repeat(500, 75, KEY_LEFT | KEY_RIGHT | KEY_DOWN | KEY_UP);*/
for(;;) {
+ backbuf = ++nframes & 1;
+
+ fb = fbptr[backbuf] + 240 * MENU_HEIGHT;
+ polyfill_framebuffer(fb, 240, VP_HEIGHT);
+ memset(fb, 14, 240 * VP_HEIGHT);
+
+ xgl_load_identity();
+ xgl_rotate_z(nframes << 8);
+ xgl_draw(XGL_TRIANGLES, varr, 3);
+
wait_vblank();
- swap_buffers();
+ present(backbuf);
}
return 0;
--- /dev/null
+/*
+blender for the Gameboy Advance
+Copyright (C) 2021 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+#include <string.h>
+#include "polyfill.h"
+#include "debug.h"
+
+static unsigned char *fb;
+static int fbwidth, fbheight;
+static short scantab[2][160] __attribute__((section(".iwram")));
+
+void polyfill_framebuffer(unsigned char *ptr, int w, int h)
+{
+ fb = ptr;
+ fbwidth = w;
+ fbheight = h;
+}
+
+#define VNEXT(p) (((p) == vlast) ? varr : (p) + 1)
+#define VPREV(p) ((p) == varr ? vlast : (p) - 1)
+#define VSUCC(p, side) ((side) == 0 ? VNEXT(p) : VPREV(p))
+
+void polyfill_flat(struct pvertex *varr, int vnum, unsigned char col)
+{
+ int i, line, top, bot;
+ struct pvertex *vlast, *v, *vn;
+ int32_t x, y0, y1, dx, dy, slope, fx, fy;
+ short *tab, start, len;
+ unsigned char *fbptr;
+
+ vlast = varr + vnum - 1;
+ top = fbheight;
+ bot = 0;
+
+ for(i=0; i<vnum; i++) {
+ v = varr + i;
+ vn = VNEXT(v);
+
+ if(vn->y == v->y) continue;
+
+ if(vn->y > v->y) {
+ tab = scantab[0];
+ } else {
+ tab = scantab[1];
+ v = vn;
+ vn = varr + i;
+ }
+
+ dx = vn->x - v->x;
+ dy = vn->y - v->y;
+ slope = (dx << 8) / dy;
+
+ y0 = (v->y + 0x100) & 0xffffff00; /* start from the next scanline */
+ fy = y0 - v->y; /* fractional part before the next scanline */
+ fx = (fy * slope) >> 8; /* X adjust for the step to the next scanline */
+ x = v->x + fx; /* adjust X */
+ y1 = vn->y & 0xffffff00; /* last scanline of the edge <= vn->y */
+
+ line = y0 >> 8;
+ if(line < top) top = line;
+ if((y1 >> 8) > bot) bot = y1 >> 8;
+
+ if(line > 0) tab += line;
+
+ while(line < (y1 >> 8) && line < fbheight) {
+ if(line >= 0) {
+ int val = x < 0 ? 0 : x >> 8;
+ *tab++ = val < fbwidth ? val : fbwidth - 1;
+ }
+ x += slope;
+ line++;
+ }
+ }
+
+ fbptr = fb + top * fbwidth;
+ for(i=top; i<bot; i++) {
+ start = scantab[0][i];
+ len = scantab[1][i] - start;
+
+ if(len > 0) {
+ memset(fbptr + start, col, len);
+ }
+ fbptr += fbwidth;
+ }
+}
--- /dev/null
+/*
+blender for the Gameboy Advance
+Copyright (C) 2021 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+#ifndef POLYFILL_H_
+#define POLYFILL_H_
+
+#include <stdint.h>
+
+struct pvertex {
+ int32_t x, y;
+};
+
+void polyfill_framebuffer(unsigned char *fb, int width, int height);
+void polyfill_flat(struct pvertex *v, int vnum, unsigned char col);
+
+#endif /* POLYFILL_H_ */
--- /dev/null
+/*
+blender for the Gameboy Advance
+Copyright (C) 2021 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+#include <string.h>
+#include <math.h>
+#include "xgl.h"
+#include "polyfill.h"
+
+#define MAT_STACK_SIZE 4
+
+static int vp[4];
+static int32_t mat[MAT_STACK_SIZE][16];
+static int mtop;
+
+void xgl_init(void)
+{
+ xgl_viewport(0, 0, 240, 160);
+ xgl_load_identity();
+}
+
+void xgl_viewport(int x, int y, int w, int h)
+{
+ vp[0] = x;
+ vp[1] = y;
+ vp[2] = w;
+ vp[3] = h;
+}
+
+void xgl_push_matrix(void)
+{
+ int prev;
+
+ if(mtop >= MAT_STACK_SIZE - 1) return;
+
+ prev = mtop++;
+ memcpy(mat[mtop], mat[prev], sizeof mat[0]);
+}
+
+void xgl_pop_matrix(void)
+{
+ if(mtop > 0) mtop--;
+}
+
+static const int32_t id[] = {
+ 0x10000, 0, 0, 0,
+ 0, 0x10000, 0, 0,
+ 0, 0, 0x10000, 0,
+ 0, 0, 0, 0x10000
+};
+
+void xgl_load_identity(void)
+{
+ xgl_load_matrix(id);
+}
+
+void xgl_load_matrix(const int32_t *m)
+{
+ memcpy(mat[mtop], m, sizeof mat[0]);
+}
+
+#define M(i,j) (((i) << 2) + (j))
+#define XMUL(a, b) (((a) >> 8) * ((b) >> 8))
+void xgl_mult_matrix(const int32_t *m2)
+{
+ int i, j;
+ int32_t m1[16];
+ int32_t *dest = mat[mtop];
+
+ memcpy(m1, dest, sizeof m1);
+
+ for(i=0; i<4; i++) {
+ for(j=0; j<4; j++) {
+ *dest++ = XMUL(m1[M(0, j)], m2[M(i, 0)]) +
+ XMUL(m1[M(1, j)], m2[M(i, 1)]) +
+ XMUL(m1[M(2, j)], m2[M(i, 2)]) +
+ XMUL(m1[M(3, j)], m2[M(i, 3)]);
+ }
+ }
+}
+
+#define XSIN(x) (int32_t)(sin(x / 65536.0f) * 65536.0f)
+#define XCOS(x) (int32_t)(cos(x / 65536.0f) * 65536.0f)
+
+void xgl_translate(int32_t x, int32_t y, int32_t z)
+{
+ int32_t m[16] = {0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000};
+ m[12] = x;
+ m[13] = y;
+ m[14] = z;
+ xgl_mult_matrix(m);
+}
+
+void xgl_rotate_x(int32_t angle)
+{
+ int32_t m[16] = {0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000};
+ int32_t sa = XSIN(angle);
+ int32_t ca = XCOS(angle);
+ m[5] = ca;
+ m[6] = sa;
+ m[9] = -sa;
+ m[10] = ca;
+ xgl_mult_matrix(m);
+}
+
+void xgl_rotate_y(int32_t angle)
+{
+ int32_t m[16] = {0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000};
+ int32_t sa = XSIN(angle);
+ int32_t ca = XCOS(angle);
+ m[0] = ca;
+ m[2] = -sa;
+ m[8] = sa;
+ m[10] = ca;
+ xgl_mult_matrix(m);
+}
+
+void xgl_rotate_z(int32_t angle)
+{
+ int32_t m[16] = {0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000, 0, 0, 0, 0, 0x10000};
+ int32_t sa = XSIN(angle);
+ int32_t ca = XCOS(angle);
+ m[0] = ca;
+ m[1] = sa;
+ m[4] = -sa;
+ m[5] = ca;
+ xgl_mult_matrix(m);
+}
+
+void xgl_scale(int32_t x, int32_t y, int32_t z)
+{
+ int32_t m[16] = {0};
+ m[0] = x;
+ m[5] = y;
+ m[10] = z;
+ m[15] = 0x10000;
+ xgl_mult_matrix(m);
+}
+
+static void xform(struct xvertex *out, const struct xvertex *in, const int32_t *m)
+{
+ out->x = XMUL(m[0], in->x) + XMUL(m[4], in->y) + XMUL(m[8], in->z) + m[12];
+ out->y = XMUL(m[1], in->x) + XMUL(m[5], in->y) + XMUL(m[9], in->z) + m[13];
+ out->z = XMUL(m[2], in->x) + XMUL(m[6], in->y) + XMUL(m[10], in->z) + m[14];
+}
+
+void xgl_draw(int prim, const struct xvertex *varr, int vcount)
+{
+ int i;
+ struct xvertex xv[4];
+ struct pvertex pv[4];
+
+ while(vcount >= prim) {
+ for(i=0; i<prim; i++) {
+ xform(xv + i, varr, mat[mtop]);
+ varr++;
+
+ /* viewport */
+ pv[i].x = ((((xv[i].x + 0x10000) >> 1) * vp[2]) >> 8) + (vp[0] << 8);
+ pv[i].y = ((((xv[i].y + 0x10000) >> 1) * vp[3]) >> 8) + (vp[1] << 8);
+ }
+ vcount -= prim;
+
+ polyfill_flat(pv, prim, 0xff);
+ }
+}
--- /dev/null
+/*
+blender for the Gameboy Advance
+Copyright (C) 2021 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+#ifndef XGL_H_
+#define XGL_H_
+
+enum {
+ XGL_LINES = 2,
+ XGL_TRIANGLES = 3,
+ XGL_QUADS = 4
+};
+
+struct xvertex {
+ int32_t x, y, z;
+ unsigned char cidx;
+};
+
+void xgl_init(void);
+
+void xgl_viewport(int x, int y, int w, int h);
+
+void xgl_push_matrix(void);
+void xgl_pop_matrix(void);
+void xgl_load_identity(void);
+void xgl_load_matrix(const int32_t *m);
+void xgl_mult_matrix(const int32_t *m);
+
+void xgl_translate(int32_t x, int32_t y, int32_t z);
+void xgl_rotate_x(int32_t angle);
+void xgl_rotate_y(int32_t angle);
+void xgl_rotate_z(int32_t angle);
+void xgl_scale(int32_t x, int32_t y, int32_t z);
+
+void xgl_draw(int prim, const struct xvertex *varr, int vcount);
+
+#endif /* XGL_H_ */
projects / gba_blender / commitdiff