util.cpp

   1 #include <GL/glew.h>
   2 #include <glm/ext.hpp>
   3 #include "shapes.hpp"
   4 #include "util.hpp"
   5
   6 GLuint utilVao;
   7 Program *utilProg;
   8
   9 Program *getUtilProg() { return utilProg; }
  10
  11 void initUtilProg() {
  12         utilProg = new Program("plainvertex.glsl", "plainfrag.glsl");
  13
  14         glGenVertexArrays(1, &utilVao);
  15         GLuint vbo;
  16         glBindVertexArray(utilVao);
  17         glGenBuffers(1, &vbo);
  18         glBindBuffer(GL_ARRAY_BUFFER, vbo);
  19         glBufferData(GL_ARRAY_BUFFER, sizeof(pyramid), pyramid, GL_STATIC_DRAW);
  20         GLuint posLoc = glGetAttribLocation(utilProg->progId, "vPosition");
  21         glEnableVertexAttribArray(posLoc);
  22         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
  23
  24         if (glGetError()) abort();
  25 }
  26
  27 void drawDebugNode(glm::mat4 model, glm::vec4 color) {
  28         GLint prevProg; glGetIntegerv(GL_CURRENT_PROGRAM, &prevProg);
  29
  30         glUseProgram(utilProg->progId);
  31
  32         glDepthRange(0, 0.01);
  33
  34         glBindVertexArray(utilVao);
  35         model = glm::scale(model, {0.1, 0.3, 0.1});
  36         GLuint modelLoc = glGetUniformLocation(utilProg->progId, "model");
  37         glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
  38
  39         GLuint colorLoc = glGetUniformLocation(utilProg->progId, "color");
  40         glUniform4fv(colorLoc, 1, glm::value_ptr(color));
  41
  42         glDrawArrays(GL_TRIANGLES, 0, 36);
  43
  44         glDepthRange(0, 1.f);
  45
  46         glUseProgram(prevProg);
  47 }