From 4e3efa239c9bcb5dd26b4ad9a4d43d4d6a266e6f Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Fri, 18 Dec 2009 13:31:07 +0100
Subject: Use multi-pass rendering with seperate ambient and light shaders

---
 src/Shader.cpp | 60 ++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 46 insertions(+), 14 deletions(-)

(limited to 'src/Shader.cpp')

diff --git a/src/Shader.cpp b/src/Shader.cpp
index 420b6c6..545d193 100644
--- a/src/Shader.cpp
+++ b/src/Shader.cpp
@@ -18,6 +18,7 @@
  */
 
 #include "Shader.h"
+
 #include <iostream>
 #include <fstream>
 #include <vector>
@@ -25,8 +26,9 @@
 
 namespace Zoom {
 
-bool Shader::loadProgram(const std::string &vertexShader, const std::string &fragmentShader) {
+boost::shared_ptr<Shader> Shader::load(const std::string &vertexShader, const std::string &fragmentShader) {
   GLhandleARB program, vs = 0, fs = 0;
+  bool ok = false;
 
   if(!vertexShader.empty())
     vs = loadShader(vertexShader, GL_VERTEX_SHADER_ARB);
@@ -36,25 +38,41 @@ bool Shader::loadProgram(const std::string &vertexShader, const std::string &fra
 
   program = glCreateProgramObjectARB();
 
-  if(vs)
-    glAttachObjectARB(program, vs);
+  if(program) {
+    if(vs)
+      glAttachObjectARB(program, vs);
+
+    if(fs)
+      glAttachObjectARB(program, fs);
 
-  if(fs)
-    glAttachObjectARB(program, fs);
+    glLinkProgramARB(program);
+    if(glGetError()) {
+      printInfoLog(program);
+    }
+    else {
+      ok = true;
+    }
 
-  glLinkProgramARB(program);
-  printInfoLog(program);
+    if(vs) {
+      glDeleteObjectARB(vs);
+    }
 
-  glUseProgramObjectARB(program);
+    if(fs) {
+      glDeleteObjectARB(fs);
+    }
+  }
 
-  return true;
+  if(ok)
+    return boost::shared_ptr<Shader>(new Shader(program));
+  else
+    return boost::shared_ptr<Shader>();
 }
 
 GLhandleARB Shader::loadShader(const std::string &name, GLenum type) {
   std::vector<std::string> lines;
   std::ifstream file(("shader/" + name).c_str(), std::ios_base::in);
   if(!file.good())
-    throw std::ios::failure("Can't read file '" + name + "'");
+    return 0;
 
   while(file.good() && !file.eof()) {
     std::string line;
@@ -69,12 +87,26 @@ GLhandleARB Shader::loadShader(const std::string &name, GLenum type) {
     strings[i] = lines[i].c_str();
   }
 
+  bool ok = false;
   GLhandleARB shader = glCreateShaderObjectARB(type);
-  glShaderSourceARB(shader, lines.size(), strings.get(), 0);
-  glCompileShaderARB(shader);
-  printInfoLog(shader);
 
-  return shader;
+  if(shader) {
+    glShaderSourceARB(shader, lines.size(), strings.get(), 0);
+    glCompileShaderARB(shader);
+    if(glGetError()) {
+      printInfoLog(shader);
+
+      glDeleteObjectARB(shader);
+    }
+    else {
+      ok = true;
+    }
+  }
+
+  if(ok)
+    return shader;
+  else
+    return 0;
 }
 
 void Shader::printInfoLog(GLhandleARB obj) {
-- 
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