various improvements

- cleaned up the computation of the camera's matrix
- changed VertexData to being a struct which transmit data between the "vertex shader" and the "fragment shader"
- started working on keyboard and mouse controls
- added fov (field of view)
- changed quaternion to euler angles conversion, from zyx to zxy
- fixed computations of z coordinates in triangle rendering
- improved naming in the triangle rasterizer

1 files changed, 7 insertions, 3 deletions

diff --git a/src/fb/chfb.cpp b/src/fb/chfb.cpp
index 71259aa..8068d8f 100644
--- a/src/fb/chfb.cpp
+++ b/src/fb/chfb.cpp
@@ -4,9 +4,13 @@
 #include "math/vector.h"
 #include "math/quat.h"
 #include "o3d/vertex_data.h"
+#include "o3d/camera.h"
 
 using namespace engine::fb;
-using engine::math::Vector3, engine::math::Quaternion, engine::o3d::VertexData;
+using
+    engine::math::Vector3,
+    engine::o3d::VertexData,
+    engine::o3d::Camera;
 
 CharacterFrameBuffer::CharacterFrameBuffer(unsigned int w, unsigned int h) {
     resize(w, h);
@@ -25,12 +29,12 @@ void CharacterFrameBuffer::clear() {
 
 // taken from https://stackoverflow.com/a/74186686
 char brightness_chars[] = " `.-':_,^=;><+!rc*/z?sLTv)J7(|Fi{C}fI31tlu[neoZ5Yxjya]2ESwqkP6h9d4VpOGbUAKXHm8RD#$Bg0MNWQ%&@";
-extern Quaternion camera_quat;
+extern Camera* camera;
 
 void CharacterFrameBuffer::draw_point(int x, int y, const Vector3& loc, const VertexData& vd, const Vector3& normal) {
     (void) loc;
     (void) vd;
-    auto v = normal.rot(camera_quat.conjugate());
+    auto v = normal.rot(camera->transform.rot.conjugate());
     float light = .1f + (v.z < 0.f ? 0.f : v.z) * .9f;
     std::uint32_t c = (int) (light * static_cast<float>(sizeof(brightness_chars) - 1));
     chars_vector[x + y * w] = brightness_chars[c];