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optimize projection functions

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Recep Aslantas
2017-05-21 19:30:38 +03:00
parent e47cc22300
commit ed5ffc43cb
1 changed files with 24 additions and 23 deletions
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27
include/cglm-cam.h
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@@ -30,21 +30,22 @@ glm_frustum(float left,
float nearVal, float nearVal,
float farVal, float farVal,
mat4 dest) { mat4 dest) {
float rl, tb, fn; float rl, tb, fn, nv;
glm__memzero(float, dest, sizeof(mat4)); glm__memzero(float, dest, sizeof(mat4));
rl = 1.0f / (right - left); rl = 1.0f / (right - left);
tb = 1.0f / (top - bottom); tb = 1.0f / (top - bottom);
fn = 1.0f / (farVal - nearVal); fn =-1.0f / (farVal - nearVal);
nv = 2.0f * nearVal;
dest[0][0] = 2.0f * nearVal * rl; dest[0][0] = nv * rl;
dest[1][1] = 2.0f * nearVal * tb; dest[1][1] = nv * tb;
dest[2][0] = (right + left) * rl; dest[2][0] = (right + left) * rl;
dest[2][1] = (top + bottom) * tb; dest[2][1] = (top + bottom) * tb;
dest[2][2] = -(farVal + nearVal) * fn; dest[2][2] = (farVal + nearVal) * fn;
dest[2][3] = -1.0f; dest[2][3] =-1.0f;
dest[3][2] = -2.0f * farVal * nearVal * fn; dest[3][2] = farVal * nv * fn;
} }
/*! /*!
@@ -73,14 +74,14 @@ glm_ortho(float left,
rl = 1.0f / (right - left); rl = 1.0f / (right - left);
tb = 1.0f / (top - bottom); tb = 1.0f / (top - bottom);
fn = 1.0f / (farVal - nearVal); fn =-1.0f / (farVal - nearVal);
dest[0][0] = 2.0f * rl; dest[0][0] = 2.0f * rl;
dest[1][1] = 2.0f * tb; dest[1][1] = 2.0f * tb;
dest[2][2] =-2.0f * fn; dest[2][2] = 2.0f * fn;
dest[3][0] =-(right + left) * rl; dest[3][0] =-(right + left) * rl;
dest[3][1] =-(top + bottom) * tb; dest[3][1] =-(top + bottom) * tb;
dest[3][2] =-(farVal + nearVal) * fn; dest[3][2] = (farVal + nearVal) * fn;
dest[3][3] = 1.0f; dest[3][3] = 1.0f;
} }
@@ -166,14 +167,14 @@ glm_perspective(float fovy,
glm__memzero(float, dest, sizeof(mat4)); glm__memzero(float, dest, sizeof(mat4));
f = cosf(fovy * 0.5f) / sinf(fovy * 0.5f); f = 1.0f / tanf(fovy * 0.5f);
fn = 1.0f / (nearVal - farVal); fn = 1.0f / (nearVal - farVal);
dest[0][0] = f / aspect; dest[0][0] = f / aspect;
dest[1][1] = f; dest[1][1] = f;
dest[2][2] = (nearVal + farVal) * fn; dest[2][2] = (nearVal + farVal) * fn;
dest[2][3] =-1.0f; dest[2][3] =-1.0f;
dest[3][2] = 2 * nearVal * farVal * fn; dest[3][2] = 2.0f * nearVal * farVal * fn;
} }
/*! /*!
@@ -206,7 +207,7 @@ CGLM_INLINE
void void
glm_perspective_resize(float aspect, glm_perspective_resize(float aspect,
mat4 proj) { mat4 proj) {
if (proj[0][0] == 0) if (proj[0][0] == 0.0f)
return; return;
proj[0][0] = proj[1][1] / aspect; proj[0][0] = proj[1][1] / aspect;