1 files changed, 84 insertions, 0 deletions

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+#include "shader.h"
+#include <fstream>
+#include <vector>
+#include "util.h"
+
+Shader::Shader(std::string name)
+{
+  GLShader vertexShader(GL_VERTEX_SHADER);
+  GLShader fragmentShader(GL_FRAGMENT_SHADER);
+
+  std::ifstream vertexFile("shaders/" + name + ".vertex");
+  std::ifstream fragmentFile("shaders/" + name + ".fragment");
+
+  std::string vertexCode(slurp(vertexFile));
+  std::string fragmentCode(slurp(fragmentFile));
+
+  const char* vertexCodePtr = vertexCode.c_str();
+  const char* fragmentCodePtr = fragmentCode.c_str();
+
+  glShaderSource(vertexShader.getId(), 1, &vertexCodePtr, nullptr);
+  glShaderSource(fragmentShader.getId(), 1, &fragmentCodePtr, nullptr);
+
+  glCompileShader(vertexShader.getId());
+  glCompileShader(fragmentShader.getId());
+
+#ifdef DEBUG
+  GLint result = GL_FALSE;
+  int infoLogLength;
+
+  glGetShaderiv(vertexShader.getId(), GL_COMPILE_STATUS, &result);
+
+  if (result == GL_FALSE)
+  {
+    glGetShaderiv(vertexShader.getId(), GL_INFO_LOG_LENGTH, &infoLogLength);
+
+    std::vector<char> errMsg(infoLogLength);
+    glGetShaderInfoLog(
+      vertexShader.getId(),
+      infoLogLength,
+      nullptr,
+      errMsg.data());
+
+    throw std::gl_error("Could not compile shader", errMsg.data());
+  }
+
+  glGetShaderiv(fragmentShader.getId(), GL_COMPILE_STATUS, &result);
+
+  if (result == GL_FALSE)
+  {
+    glGetShaderiv(fragmentShader.getId(), GL_INFO_LOG_LENGTH, &infoLogLength);
+
+    std::vector<char> errMsg(infoLogLength);
+    glGetShaderInfoLog(
+      fragmentShader.getId(),
+      infoLogLength,
+      nullptr,
+      errMsg.data());
+
+    throw std::gl_error("Could not compile shader", errMsg.data());
+  }
+#endif
+
+  glAttachShader(program_.getId(), vertexShader.getId());
+  glAttachShader(program_.getId(), fragmentShader.getId());
+  glLinkProgram(program_.getId());
+
+#ifdef DEBUG
+  glGetProgramiv(program_.getId(), GL_LINK_STATUS, &result);
+
+  if (result == GL_FALSE)
+  {
+    glGetProgramiv(program_.getId(), GL_INFO_LOG_LENGTH, &infoLogLength);
+
+    std::vector<char> errMsg(infoLogLength);
+    glGetProgramInfoLog(
+      program_.getId(),
+      infoLogLength,
+      nullptr,
+      errMsg.data());
+
+    throw std::gl_error("Could not link shader program", errMsg.data());
+  }
+#endif
+}