tyrel/pikuma_graphics_from_scratch
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add a cube

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This commit is contained in:
Tyrel Souza 2024-04-13 00:51:28 -04:00
parent 2d7da84f8d
commit d38ce455af
2 changed files with 71 additions and 69 deletions
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3
Makefile
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@ -2,11 +2,10 @@ SRCS = $(shell find ./src -type f -name *.c)
build: build:
gcc -Wall -std=c99 $(SRCS) -lSDL2 -o renderer gcc -Wall -std=c99 $(SRCS) -lSDL2 -o renderer
./renderer
run: build run: build
./renderer ./renderer
clean: clean:
rm renderer rm renderer
all: clean build run

9
src/main.c
View File

@ -10,7 +10,9 @@
#define N_POINTS (9 * 9 * 9) #define N_POINTS (9 * 9 * 9)
vec3_t cube_points[N_POINTS]; vec3_t cube_points[N_POINTS];
vec2_t projected_points[N_POINTS]; vec2_t projected_points[N_POINTS];
float fov_factor = 128;
vec3_t camera_position = {0, 0, -5};
float fov_factor = 640;
bool is_running = false; bool is_running = false;
@ -59,8 +61,8 @@ void process_input(void) {
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
vec2_t project(vec3_t point) { vec2_t project(vec3_t point) {
vec2_t projected_point = { vec2_t projected_point = {
.x = (fov_factor * point.x), .x = (fov_factor * point.x) / point.z,
.y = (fov_factor * point.y), .y = (fov_factor * point.y) / point.z,
}; };
return projected_point; return projected_point;
} }
@ -69,6 +71,7 @@ vec2_t project(vec3_t point) {
void update(void) { void update(void) {
for (int i = 0; i < N_POINTS; i++){ for (int i = 0; i < N_POINTS; i++){
vec3_t point = cube_points[i]; vec3_t point = cube_points[i];
point.z -= camera_position.z;
vec2_t projected_point = project(point); vec2_t projected_point = project(point);
projected_points[i] = projected_point; projected_points[i] = projected_point;