correct me if I'm wrong
You're not wrong. I checked everything else: the projection and view matrix code looks correct.
You're also correct that all this shouldn't be done in the shader. Most of these (excluding the model matrix) only have to be computed once per render loop.
If it helps here's my projection and view matrix routines (they match yours):
static __inline__ simd_float4x4 matrix4x4_perspective_projection(float inAspect, float inFovRAD, float inNear, float inFar)
{
float y = 1 / tan(inFovRAD * 0.5);
float x = y / inAspect;
float z = inFar / (inFar - inNear);
simd_float4 X = { x, 0, 0, 0};
simd_float4 Y = { 0, y, 0, 0};
simd_float4 Z = { 0, 0, z, 1};
simd_float4 W = { 0, 0, z * -inNear, 0};
return (matrix_float4x4) {{X, Y, Z, W}};
}
static __inline__ simd_float4x4 matrix4x4_lookAt(const simd_float3 inEye,
const simd_float3 inTo,
const simd_float3 inUp)
{
//forward vector
simd_float3 zAxis = simd_normalize(inTo - inEye);
//horizontal vector
simd_float3 xAxis = simd_normalize(simd_cross(inUp, zAxis));
//vertical vector
simd_float3 yAxis = simd_cross(zAxis, xAxis);
//translation vector
simd_float3 t = (simd_float3) {-simd_dot(xAxis, inEye), -simd_dot(yAxis, inEye), -simd_dot(zAxis, inEye)};
return (matrix_float4x4) {{
{ xAxis.x, yAxis.x, zAxis.x, 0 },
{ xAxis.y, yAxis.y, zAxis.y, 0 },
{ xAxis.z, yAxis.z, zAxis.z, 0 },
{ t.x, t.y, t.z, 1 }
}};
} // lookAt
