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fix: change value to persp matrix

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This commit is contained in:
Loïc GUEZO
2025-09-03 18:24:24 +02:00
parent 8d3a55e7f5
commit 64711af006
2 changed files with 18 additions and 31 deletions
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21
src/cam.c
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@@ -5,14 +5,14 @@
Mat4f_t perspCam(float fov, float asp, float near, float far)
{
const float t = 1.f / tanf(fov*0.5f);
const float fn = near - far;
const float t = 1.f / tanf(fov * 0.5f * (M_PI/180.f));
const float fn = far - near;
const float persp[16] =
{
t/asp, 0.f, 0.f, 0.f,
0.f, t, 0.f, 0.f,
0.f, 0.f, (far + near) / fn, -1.f,
0.f, 0.f, (2.f * far * near) / fn, 0.f
0.f, 0.f, -(far + near) / fn, -1.f,
0.f, 0.f, -(2.f * far * near) / fn, 0.f
};
return mat4f_from_array(persp);
@@ -48,14 +48,11 @@ Mat4f_t lookAt(Vec4f_t* eye, Vec4f_t* center, Vec4f_t* up)
Vec4f_t u = vec4f_cross(s, f);
u.data[3] = 0.f;
const float m[16] = {
s.x, u.x, -f.x, 0.f,
s.y, u.y, -f.y, 0.f,
s.z, u.z, -f.z, 0.f,
-vec4f_dot(s, *eye),
-vec4f_dot(u, *eye),
vec4f_dot(f, *eye),
1.f
float m[16] = {
s.x, s.y, s.z, -vec4f_dot(s, *eye),
u.x, u.y, u.z, -vec4f_dot(u, *eye),
-f.x, -f.y, -f.z, -vec4f_dot(f, *eye),
0.f, 0.f, 0.f, 1.f
};
return mat4f_from_array(m);

28
src/main.c
View File

@@ -1,28 +1,17 @@
#include <stdio.h>
#include "cam.h"
#include "math/vec4.h"
Vec4f_t mat4f_mul_vec4f(const Mat4f_t mat, Vec4f_t v)
{
Vec4f_t out;
for (int i = 0; i < 4; i++)
{
out.data[i] = 0.f;
for (int j = 0; j < 4; j++)
out.data[i] += mat.m[i*4 + j] * v.data[j];
}
return out;
}
#include "draw.h"
#include "math/mv4.h"
int main(int argc, const char** argv)
{
const float fov = 60;
const float width = 1000, height = 800;
const float width = 80, height = 30;
const float near = 0.1, far = 1000;
const float aspect = width / height;
// xyz = [-1, 1]
// xyz = [-1; 1]
Vec4f_t vec = vec4f(0.f, 0.f, -1.f, 1.f);
Mat4f_t proj = perspCam(fov, aspect, near, far);
@@ -30,9 +19,10 @@ int main(int argc, const char** argv)
normCoord_r(&v_clip);
viewport_r(&v_clip, width, height);
printf("Screen coordinates: x = %f, y = %f, z = %f\n",
v_clip.x, v_clip.y, v_clip.z);
initCanvas(width, height);
drawCanvas(v_clip, width, height);
renderCanvas(width, height);
printf("%f", v_clip.z);
return 0;
}