#include "gfx/dag_uniforms.h"
#include "gfx/gl_loader.h"
#include <algorithm>
#include <cstring>

namespace fn::gfx {

static constexpr int MAX_NODES = 16;

void dag_uniforms_apply(const std::vector<DagStep>& pipeline, unsigned int program) {
    float data[MAX_NODES * 4];
    std::memset(data, 0, sizeof(data));

    const int n = static_cast<int>(std::min(pipeline.size(), static_cast<size_t>(MAX_NODES)));
    for (int i = 0; i < n; ++i) {
        const auto& step = pipeline[static_cast<size_t>(i)];
        data[i * 4 + 0] = step.params[0];
        data[i * 4 + 1] = step.params[1];
        data[i * 4 + 2] = step.params[2];
        data[i * 4 + 3] = step.params[3];
    }

    GLint loc = glGetUniformLocation(program, "u_params");
    if (loc >= 0) glUniform4fv(loc, MAX_NODES, data);
}

} // namespace fn::gfx