line.cpp

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/*
 * Copyright 2014 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include "tango-gl/line.h"
 
namespace tango_gl {
Line::Line(float line_width, GLenum render_mode) {
  line_width_ = line_width;
  render_mode_ = render_mode;
}
void Line::SetLineWidth(const float pixels) { line_width_ = pixels; }
void Line::Render(const glm::mat4& projection_mat,
                  const glm::mat4& view_mat) const {
  glUseProgram(shader_program_);
  glLineWidth(line_width_);
  glm::mat4 model_mat = GetTransformationMatrix();
  glm::mat4 mvp_mat = projection_mat * view_mat * model_mat;
  glUniformMatrix4fv(uniform_mvp_mat_, 1, GL_FALSE, glm::value_ptr(mvp_mat));
 
  glUniform4f(uniform_color_, red_, green_, blue_, alpha_);
 
  glEnableVertexAttribArray(attrib_vertices_);
  glVertexAttribPointer(attrib_vertices_, 3, GL_FLOAT, GL_FALSE,
                        sizeof(glm::vec3), &vec_vertices_[0]);
  glDrawArrays(render_mode_, 0, vec_vertices_.size());
 
  glDisableVertexAttribArray(attrib_vertices_);
  glUseProgram(0);
}
 
}  // namespace tango_gl