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#include "renderer.h"
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "context.h"
#include "dyn_arr.h"
struct ty_renderer r;
static
void renderer_init_check()
{
#ifdef TEENSY_DEBUG
if (
r.screen.data == NULL ||
r.screen.width * r.screen.height == 0
) {
ty_log_fatal(
TY_ERR_RENDERER_NOT_INIT,
"renderer is not yet intialized"
);
}
#endif
}
static
void image_bounds_check(struct ty_image img, struct ty_vec2i pos)
{
#ifdef TEENSY_DEBUG
if (
pos.x < 0 ||
pos.x >= img.width ||
pos.y < 0 ||
pos.y >= img.height
) {
ty_log_fatal(
TY_ERR_RENDER_OOB,
"rendered at (%d, %d), when bounds are "
"(0, 0) to (%d, %d)",
pos.x, pos.y,
img.width, img.height
);
}
#endif
}
void ty_init_renderer(void)
{
r.screen = ty_create_image(
ctx.creation_hints.win_width,
ctx.creation_hints.win_height,
NULL
);
}
void ty_deinit_renderer(void)
{
renderer_init_check();
ty_free_image(r.screen);
}
struct ty_image ty_create_image(int w, int h, const struct ty_color* data)
{
struct ty_image img;
img.width = w;
img.height = h;
size_t size = sizeof(struct ty_color) * w * h;
img.data = ty_alloc(size);
if (data)
memcpy(img.data, data, size);
else
memset(img.data, 0, size);
return img;
}
void ty_free_image(struct ty_image img)
{
ty_free(img.data);
}
struct ty_color ty_img_get_pixel(struct ty_image img, struct ty_vec2i pos)
{
image_bounds_check(img, pos);
return img.data[pos.y * img.width + pos.x];
}
void ty_img_set_pixel(
struct ty_image img,
struct ty_vec2i pos,
struct ty_color color
) {
image_bounds_check(img, pos);
img.data[pos.y * img.width + pos.x] = color;
}
void ty_draw_clear(struct ty_color col)
{
renderer_init_check();
for (int i = 0; i < r.screen.width * r.screen.height; i++) {
r.screen.data[i] = col;
}
}
void ty_draw_image(struct ty_image img, struct ty_vec2i pos)
{
int x1 = fmin(fmax(floor(pos.x), 0), r.screen.width);
int y1 = fmin(fmax(floor(pos.y), 0), r.screen.height);
int x2 = fmin(fmax(floor(pos.x + img.width), 0), r.screen.width);
int y2 = fmin(fmax(floor(pos.y + img.height), 0), r.screen.height);
for (int dx = x1; dx < x2; dx++) {
for (int dy = y1; dy < y2; dy++) {
struct ty_vec2i tex_coord = ty_vec2i(dx - x1, dy - y1);
ty_img_set_pixel(
r.screen,
(struct ty_vec2i){dx, dy},
ty_img_get_pixel(img, tex_coord)
);
}
}
}
void ty_draw_image_ex(
struct ty_image img,
struct ty_recti src,
struct ty_recti dst
) {
int x1 = fmin(fmax(floor(dst.x), 0), r.screen.width);
int y1 = fmin(fmax(floor(dst.y), 0), r.screen.height);
int x2 = fmin(fmax(floor(dst.x + dst.w), 0), r.screen.width);
int y2 = fmin(fmax(floor(dst.y + dst.h), 0), r.screen.height);
for (int dx = x1; dx < x2; dx++) {
for (int dy = y1; dy < y2; dy++) {
int tex_x = (dx - x1) / (dst.w / src.w) + src.x;
int tex_y = (dy - y1) / (dst.h / src.h) + src.y;
ty_img_set_pixel(
r.screen,
(struct ty_vec2i){dx, dy},
ty_img_get_pixel(img, ty_vec2i(tex_x, tex_y))
);
}
}
}
void ty_draw_rect(struct ty_recti rect, struct ty_color color)
{
int x1 = fmin(fmax(floor(rect.x), 0), r.screen.width);
int y1 = fmin(fmax(floor(rect.y), 0), r.screen.height);
int x2 = fmin(fmax(floor(rect.x + rect.w), 0), r.screen.width);
int y2 = fmin(fmax(floor(rect.y + rect.h), 0), r.screen.height);
for (int dx = x1; dx < x2; dx++) {
for (int dy = y1; dy < y2; dy++) {
ty_img_set_pixel(
r.screen,
(struct ty_vec2i){dx, dy},
color
);
}
}
}
void ty_draw_line(
struct ty_vec2i start,
struct ty_vec2i end,
struct ty_color color
) {
int dx = end.x - start.x;
int dy = end.y - start.y;
if (abs(dx) > abs(dy)) {
if (start.x > end.x) {
int tmp = start.x;
start.x = end.x;
end.x = tmp;
tmp = start.y;
start.y = end.y;
end.y = tmp;
}
for (int x = start.x; x < end.x; x++) {
int y = start.y + dy * (x - start.x) / dx;
ty_img_set_pixel(
r.screen,
(struct ty_vec2i){x, y},
color
);
}
} else {
if (start.y > end.y) {
int tmp = start.x;
start.x = end.x;
end.x = tmp;
tmp = start.y;
start.y = end.y;
end.y = tmp;
}
for (int y = start.y; y < end.y; y++) {
int x = start.x + dx * (y - start.y) / dy;
ty_img_set_pixel(
r.screen,
ty_vec2i(x, y),
color
);
}
}
}
void ty_draw_end(void)
{
renderer_init_check();
}
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