src/fb/pixfb.cpp


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#include "fb/pixfb.h"
#include <cstdint>
#include <algorithm>
#include "math/vector.h"
#include "math/quat.h"
#include "o3d/vertex_data.h"

using namespace engine::fb;
using engine::math::Vector3, engine::o3d::VertexData;

PixelFrameBuffer::PixelFrameBuffer(unsigned int w, unsigned int h) {
    resize(w, h);
}

void PixelFrameBuffer::resize(unsigned int w, unsigned int h) {
    this->w = w;
    this->h = h;
    pixels_vector.resize(w * h);
    clear();
}

void PixelFrameBuffer::clear() {
    std::fill(pixels_vector.begin(), pixels_vector.end(), 0x000000FF);
}

extern engine::math::Quaternion camera_quat;

void PixelFrameBuffer::draw_point(int x, int y, const Vector3& loc, const VertexData& vd, const Vector3& normal) {
    (void) loc;
    (void) vd;
    // int ir = ((int) (((float) ((int) (vd.tx * 10.f))) * 25.5f));
    // int ig = ((int) (((float) ((int) (vd.ty * 10.f))) * 25.5f));
    // pixels_vector[x + y * w] = (ir << 24) | (ig << 16) | 0xFFFF;
    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 * 255.f);
    pixels_vector[x + y * w] = c << 24 | c << 16 | c << 8 | 0xff;
}