added brightness to terminal frame buffers

1 files changed, 11 insertions, 5 deletions

diff --git a/src/fb/chfb.cpp b/src/fb/chfb.cpp
index 98c9f23..71259aa 100644
--- a/src/fb/chfb.cpp
+++ b/src/fb/chfb.cpp
@@ -1,10 +1,12 @@
 #include "fb/chfb.h"
 #include <algorithm>
+#include <cstdint>
 #include "math/vector.h"
+#include "math/quat.h"
 #include "o3d/vertex_data.h"
 
 using namespace engine::fb;
-using engine::math::Vector3, engine::o3d::VertexData;
+using engine::math::Vector3, engine::math::Quaternion, engine::o3d::VertexData;
 
 CharacterFrameBuffer::CharacterFrameBuffer(unsigned int w, unsigned int h) {
     resize(w, h);
@@ -21,11 +23,15 @@ void CharacterFrameBuffer::clear() {
     std::fill(chars_vector.begin(), chars_vector.end(), ' ');
 }
 
+// taken from https://stackoverflow.com/a/74186686
+char brightness_chars[] = " `.-':_,^=;><+!rc*/z?sLTv)J7(|Fi{C}fI31tlu[neoZ5Yxjya]2ESwqkP6h9d4VpOGbUAKXHm8RD#$Bg0MNWQ%&@";
+extern Quaternion camera_quat;
+
 void CharacterFrameBuffer::draw_point(int x, int y, const Vector3& loc, const VertexData& vd, const Vector3& normal) {
-    (void) x;
-    (void) y;
     (void) loc;
     (void) vd;
-    (void) normal;
-    chars_vector[x + y * w] = 'A';
+    auto v = normal.rot(camera_quat.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];
 }