Initial commit

1 files changed, 227 insertions, 0 deletions

diff --git a/teensy/renderer.c b/teensy/renderer.c
new file mode 100644
index 0000000..9e5f824
--- /dev/null
+++ b/teensy/renderer.c
@@ -0,0 +1,227 @@
+#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();
+}