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#include "render.h"
static struct {
Colour pixels[renderer_w * renderer_h];
} renderer;
Colour make_colour(unsigned rgb, unsigned char a) {
Colour r;
r.r = (unsigned char)(rgb >> 16);
r.g = (unsigned char)(rgb >> 8);
r.b = (unsigned char)rgb;
r.a = a;
return r;
}
Colour make_black() {
Colour r = { 0, 0, 0, 255 };
return r;
}
Colour make_white() {
return make_colour(0xffffff, 255);
}
void init_bitmap(
Bitmap* bitmap,
Colour* pixels,
int w,
int h
) {
bitmap->pixels = pixels;
bitmap->w = w;
bitmap->h = h;
}
void init_renderer() {
}
void renderer_begin_frame() {
int i;
for (i = 0; i < renderer_w * renderer_h; i++) {
renderer.pixels[i] = make_black();
}
}
Colour* get_render_pixels() {
return renderer.pixels;
}
Colour blend(Colour dst, Colour src) {
int ima;
ima = 0xff - src.a;
dst.r = (unsigned char)(((src.r * src.a) + (dst.r * ima)) >> 8);
dst.g = (unsigned char)(((src.g * src.a) + (dst.g * ima)) >> 8);
dst.b = (unsigned char)(((src.b * src.a) + (dst.b * ima)) >> 8);
return dst;
}
Colour blend_mod(Colour dst, Colour src, Colour mod) {
int ima;
src.a = (src.a * mod.a) >> 8;
ima = 0xff - src.a;
dst.r = (unsigned char)(((src.r * mod.r * src.a) >> 16) + ((dst.r * ima) >> 8));
dst.g = (unsigned char)(((src.g * mod.g * src.a) >> 16) + ((dst.g * ima) >> 8));
dst.b = (unsigned char)(((src.b * mod.b * src.a) >> 16) + ((dst.b * ima) >> 8));
return dst;
}
void init_font(
BM_Font* font,
Bitmap* bmp,
int char_w,
int char_h,
int chars_across
) {
font->bmp = bmp;
font->char_w = char_w;
font->char_h = char_h;
font->chars_across = chars_across;
}
void rfont_char(int x, int y, char c) {
}
void rfont_char_col(int x, int y, char c, Colour colour) {
}
void rfont_text(
int x,
int y,
const char* text
) {
}
void rfont_text_col(
int x,
int y,
const char* text,
Colour colour
) {
}
void render_bitmap(
const Bitmap* bitmap,
int x,
int y,
const Rectangle* rect
) {
int i, j, stride, sstride, n;
Colour* dst;
const Colour* src;
Rectangle sub;
sub = *rect;
if (sub.w <= 0) { return; }
if (sub.h <= 0) { return; }
if (sub.w > bitmap->w) { return; }
if (sub.h > bitmap->h) { return; }
if ((n = -x) > 0) {
sub.w -= n;
sub.x += n;
x += n;
}
if ((n = -y) > 0) {
sub.h -= n;
sub.y += n;
y += n;
}
if ((n = x + sub.w - renderer_w) > 0) {
sub.w -= n;
}
if ((n = y + sub.h - renderer_h) > 0) {
sub.h -= n;
}
if (sub.w <= 0) { return; }
if (sub.h <= 0) { return; }
dst = renderer.pixels + (x + y * renderer_w);
src = bitmap->pixels + (sub.x + sub.y * bitmap->w);
stride = renderer_w - sub.w;
sstride = bitmap->w - sub.w;
for (i = 0; i < sub.h; i++) {
for (j = 0; j < sub.w; j++) {
*dst = blend(*dst, *src);
dst++;
src++;
}
dst += stride;
src += sstride;
}
}
void render_bitmap_col(
const Bitmap* bitmap,
int x,
int y,
const Rectangle* rect,
Colour colour
) {
}
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