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Remove focal_len parameter from camera (hard-code as 1.0)

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This commit is contained in:
Camden Dixie O'Brien
2025-09-23 15:36:08 +01:00
parent bb6c1683b2
commit 75159e7223
3 changed files with 8 additions and 9 deletions
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4
demo.c
View File

@@ -7,7 +7,6 @@
#define W 800 #define W 800
#define H 600 #define H 600
#define FOCAL_LEN 1.0
#define FOV 120 #define FOV 120
#define SAMPLES_PER_PIXEL 100 #define SAMPLES_PER_PIXEL 100
@@ -31,8 +30,7 @@ static pix_t pixbuf[W * H];
int main() int main()
{ {
img_t img = { .pix = pixbuf }; img_t img = { .pix = pixbuf };
camera_t camera camera_t camera = camera_init(camera_pos, FOV, W, H, SAMPLES_PER_PIXEL);
= camera_init(camera_pos, FOCAL_LEN, FOV, W, H, SAMPLES_PER_PIXEL);
camera_render(&camera, scene, NELEMS(scene), &img); camera_render(&camera, scene, NELEMS(scene), &img);
ff_write(STDOUT_FILENO, img); ff_write(STDOUT_FILENO, img);

4
include/camera.h
View File

@@ -15,8 +15,8 @@ typedef struct {
} camera_t; } camera_t;
camera_t camera_init( camera_t camera_init(
vec3_t pos, double focal_len, double fov, uint32_t img_width, vec3_t pos, double fov, uint32_t img_width, uint32_t img_height,
uint32_t img_height, unsigned samples_per_pixel); unsigned samples_per_pixel);
void camera_render( void camera_render(
const camera_t *camera, const obj_t *scene, unsigned scene_count, const camera_t *camera, const obj_t *scene, unsigned scene_count,

9
src/camera.c
View File

@@ -16,6 +16,7 @@
#define MAX_ITER 10 #define MAX_ITER 10
#define MIN_T 1e-6 #define MIN_T 1e-6
#define SAMPLE_STDDEV 0.333 #define SAMPLE_STDDEV 0.333
#define FOCAL_LEN 1.0
#define GAMMA 2.2 #define GAMMA 2.2
@@ -117,15 +118,15 @@ static int render_thread(void *arg)
} }
camera_t camera_init( camera_t camera_init(
vec3_t pos, double focal_len, double fov, uint32_t img_width, vec3_t pos, double fov, uint32_t img_width, uint32_t img_height,
uint32_t img_height, unsigned samples_per_pixel) unsigned samples_per_pixel)
{ {
const double aspect = (double)img_width / (double)img_height; const double aspect = (double)img_width / (double)img_height;
const double fov_rad = M_PI * fov / 180.0; const double fov_rad = M_PI * fov / 180.0;
const double viewport_height = focal_len * tan(fov_rad / 2); const double viewport_height = FOCAL_LEN * tan(fov_rad / 2);
const double viewport_width = viewport_height * aspect; const double viewport_width = viewport_height * aspect;
const vec3_t viewport_disp = { 0, 0, focal_len }; const vec3_t viewport_disp = { 0, 0, FOCAL_LEN };
const vec3_t u = { viewport_width, 0, 0 }; const vec3_t u = { viewport_width, 0, 0 };
const vec3_t v = { 0, -viewport_height, 0 }; const vec3_t v = { 0, -viewport_height, 0 };