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improve cam impl

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This commit is contained in:
Recep Aslantas
2016-10-30 23:08:44 +02:00
parent f0547e2535
commit ec6c9ae497
1 changed files with 33 additions and 27 deletions
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58
include/cglm-cam.h
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@@ -20,17 +20,21 @@ glm_frustum(float left,
float nearVal,
float farVal,
mat4 dest) {
/* https://www.opengl.org/sdk/docs/man2/xhtml/glFrustum.xml */
float rl, tb, fn;
glm__memzero(float, dest, sizeof(mat4));
dest[0][0] = 2.0f * nearVal / (right - left);
dest[1][1] = 2.0f * nearVal / (top - bottom);
dest[2][0] = (right + left) / (right - left);
dest[2][1] = (top + bottom) / (top - bottom);
dest[2][2] = -(farVal + nearVal) / (farVal - nearVal);
rl = 1.0f / (right - left);
tb = 1.0f / (top - bottom);
fn = 1.0f / (farVal - nearVal);
dest[0][0] = 2.0f * nearVal * rl;
dest[1][1] = 2.0f * nearVal * tb;
dest[2][0] = (right + left) * rl;
dest[2][1] = (top + bottom) * tb;
dest[2][2] = -(farVal + nearVal) * fn;
dest[2][3] = -1.0f;
dest[3][2] = -2.0f * farVal * nearVal / (farVal - nearVal);
dest[3][2] = -2.0f * farVal * nearVal * fn;
}
CGLM_INLINE
@@ -42,16 +46,20 @@ glm_ortho(float left,
float nearVal,
float farVal,
mat4 dest) {
/* https://www.opengl.org/sdk/docs/man2/xhtml/glOrtho.xml */
float rl, tb, fn;
glm__memzero(float, dest, sizeof(mat4));
dest[0][0] = 2.0f / (right - left);
dest[1][1] = 2.0f / (top - bottom);
dest[2][2] =-2.0f / (farVal - nearVal);
dest[3][0] =-(right + left) / (right - left);
dest[3][1] =-(top + bottom) / (top - bottom);
dest[3][2] =-(farVal + nearVal) / (farVal - nearVal);
rl = 1.0f / (right - left);
tb = 1.0f / (top - bottom);
fn = 1.0f / (farVal - nearVal);
dest[0][0] = 2.0f * rl;
dest[1][1] = 2.0f * tb;
dest[2][2] =-2.0f * fn;
dest[3][0] =-(right + left) * rl;
dest[3][1] =-(top + bottom) * tb;
dest[3][2] =-(farVal + nearVal) * fn;
dest[3][3] = 1.0f;
}
@@ -118,18 +126,18 @@ glm_perspective(float fovy,
float nearVal,
float farVal,
mat4 dest) {
/* https://www.opengl.org/sdk/docs/man2/xhtml/gluPerspective.xml */
float f;
float f, fn;
glm__memzero(float, dest, sizeof(mat4));
f = cosf(fovy * 0.5f) / sinf(fovy * 0.5f);
fn = 1.0f / (nearVal - farVal);
dest[0][0] = f / aspect;
dest[1][1] = f;
dest[2][2] = (nearVal + farVal) / (nearVal - farVal);
dest[2][2] = (nearVal + farVal) * fn;
dest[2][3] =-1.0f;
dest[3][2] = 2 * nearVal * farVal / (nearVal - farVal);
dest[3][2] = 2 * nearVal * farVal * fn;
}
CGLM_INLINE
@@ -162,21 +170,19 @@ glm_lookat(vec3 eye,
glm_vec_cross(s, f, u);
dest[0][0] = s[0];
dest[1][0] = s[1];
dest[2][0] = s[2];
dest[0][1] = u[0];
dest[1][1] = u[1];
dest[2][1] = u[2];
dest[0][2] =-f[0];
dest[1][0] = s[1];
dest[1][1] = u[1];
dest[1][2] =-f[1];
dest[2][0] = s[2];
dest[2][1] = u[2];
dest[2][2] =-f[2];
dest[3][0] =-glm_vec_dot(s, eye);
dest[3][1] =-glm_vec_dot(u, eye);
dest[3][2] = glm_vec_dot(f, eye);
dest[0][3] = 0;
dest[1][3] = 0;
dest[2][3] = 0;
dest[3][3] = 1;
dest[0][3] = dest[1][3] = dest[2][3] = 0.0f;
dest[3][3] = 1.0f;
}
#endif /* cglm_vcam_h */