From ed3b5fa454607f8850e613771c8dea6288600a1c Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Mon, 3 Sep 2012 00:29:05 -0400
Subject: [PATCH] add GLProgram class

---
 src/client/GLProgram.cc | 60 +++++++++++++++++++++++++++++++++++++++++
 src/client/GLProgram.h  | 26 ++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 src/client/GLProgram.cc
 create mode 100644 src/client/GLProgram.h

diff --git a/src/client/GLProgram.cc b/src/client/GLProgram.cc
new file mode 100644
index 0000000..1132940
--- /dev/null
+++ b/src/client/GLProgram.cc
@@ -0,0 +1,60 @@
+
+#include "GLProgram.h"
+#include <iostream>
+
+using namespace std;
+
+GLProgram::GLProgram()
+{
+    m_id = 0;
+}
+
+GLProgram::~GLProgram()
+{
+    if (m_id > 0)
+    {
+        glDeleteProgram(m_id);
+    }
+}
+
+bool GLProgram::create(const char *v_source, const char *f_source,
+                GLProgram::AttributeBinding *bindings)
+{
+    if (!m_v_shader.create(GL_VERTEX_SHADER, v_source))
+        return false;
+    if (!m_f_shader.create(GL_FRAGMENT_SHADER, f_source))
+        return false;
+    m_id = glCreateProgram();
+    if (m_id <= 0)
+        return false;
+    glAttachShader(m_id, m_v_shader.get_id());
+    glAttachShader(m_id, m_f_shader.get_id());
+
+    if (bindings != NULL)
+    {
+        for (int i = 0; bindings[i].name != NULL; i++)
+        {
+            glBindAttribLocation(m_id, bindings[i].index, bindings[i].name);
+        }
+    }
+
+    glLinkProgram(m_id);
+
+    GLint link_status;
+    glGetProgramiv(m_id, GL_LINK_STATUS, &link_status);
+    if (link_status != GL_TRUE)
+    {
+        GLint log_length;
+        glGetProgramiv(m_id, GL_INFO_LOG_LENGTH, &log_length);
+        if (log_length > 0)
+        {
+            char *log = new char[log_length];
+            glGetProgramInfoLog(m_id, log_length, &log_length, log);
+            cerr << "Program log:" << endl << log << endl;
+            delete[] log;
+        }
+        return false;
+    }
+
+    return true;
+}
diff --git a/src/client/GLProgram.h b/src/client/GLProgram.h
new file mode 100644
index 0000000..d2039b8
--- /dev/null
+++ b/src/client/GLProgram.h
@@ -0,0 +1,26 @@
+
+#ifndef GLPROGRAM_H
+#define GLPROGRAM_H
+
+#include "GLShader.h"
+
+class GLProgram
+{
+    public:
+        typedef struct
+        {
+            GLuint index;
+            const char *name;
+        } AttributeBinding;
+        GLProgram();
+        ~GLProgram();
+        bool create(const char *v_source, const char *f_source,
+                AttributeBinding *bindings = NULL);
+        GLuint get_id() { return m_id; }
+    protected:
+        GLuint m_id;
+        GLShader m_v_shader;
+        GLShader m_f_shader;
+};
+
+#endif