#include <mbgl/shader/linesdf_shader.hpp>
#include <mbgl/shader/shaders.hpp>
#include <mbgl/platform/gl.hpp>

#include <cstdio>

using namespace mbgl;

LineSDFShader::LineSDFShader()
    : Shader(
        "line",
        shaders[LINESDF_SHADER].vertex,
        shaders[LINESDF_SHADER].fragment
    ) {
    if (!valid) {
        fprintf(stderr, "invalid line shader\n");
        return;
    }

    a_pos = MBGL_CHECK_ERROR(glGetAttribLocation(program, "a_pos"));
    a_data = MBGL_CHECK_ERROR(glGetAttribLocation(program, "a_data"));
}

void LineSDFShader::bind(char *offset) {
    MBGL_CHECK_ERROR(glEnableVertexAttribArray(a_pos));
    MBGL_CHECK_ERROR(glVertexAttribPointer(a_pos, 2, GL_SHORT, false, 8, offset + 0));

    MBGL_CHECK_ERROR(glEnableVertexAttribArray(a_data));
    MBGL_CHECK_ERROR(glVertexAttribPointer(a_data, 4, GL_BYTE, false, 8, offset + 4));
}