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Add levelling

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This commit is contained in:
Camden Dixie O'Brien
2025-10-15 18:37:21 +01:00
parent ac0d3de2fb
commit a1cfb77cac
5 changed files with 122 additions and 38 deletions
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38
renderer.c
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@@ -20,6 +20,8 @@ static int front, back;
static uint32_t width, height;
static mat3_t view;
static bool wrap;
static vec3_t vert_buf[MAX_VERTS];
static void page_flip_handler(int, unsigned, unsigned, unsigned, void *)
@@ -34,6 +36,13 @@ static void set_pixel(uint32_t x, uint32_t y)
static void draw_line(vec3_t v1, vec3_t v2)
{
v1.x /= v1.z;
v1.y /= v1.z;
v1.z = 1;
v2.x /= v2.z;
v2.y /= v2.z;
v2.z = 1;
const float delta_x = v2.x - v1.x;
const float delta_y = v2.y - v1.y;
const float step = fmaxf(fabsf(delta_x), fabsf(delta_y));
@@ -43,16 +52,20 @@ static void draw_line(vec3_t v1, vec3_t v2)
for (unsigned i = 0; i <= step; ++i) {
float x = roundf(v1.x + i * step_x);
if (x >= width)
x -= width;
else if (x < 0)
x += width;
float y = roundf(v1.y + i * step_y);
if (y >= height)
y -= height;
else if (y < 0)
y += height;
if (wrap) {
if (x >= width)
x -= width;
else if (x < 0)
x += width;
if (y >= height)
y -= height;
else if (y < 0)
y += height;
} else if (x >= width || x < 0 || y >= height || y < 0) {
continue;
}
set_pixel(x, y);
}
@@ -89,6 +102,8 @@ renderer_params_t renderer_init()
width = mode.hdisplay;
height = mode.vdisplay;
wrap = true;
const float aspect = (float)width / (float)height;
const float scale = (float)height / 2.0f;
view = (mat3_t) {
@@ -136,6 +151,11 @@ void renderer_swap()
back = (back + 1) & 1;
}
void renderer_set_wrap(bool enable)
{
wrap = enable;
}
void renderer_clear()
{
memset(fbs[back].buf, 0, fbs[back].size);