1 files changed, 77 insertions, 0 deletions
diff --git a/Project/Renderer.cpp b/Project/Renderer.cpp
new file mode 100644
index 0000000..8a80686
--- /dev/null
+++ b/Project/Renderer.cpp
@@ -0,0 +1,77 @@
+#include "Renderer.h"
+#include <wx/msgdlg.h>
+#include <wx/string.h>
+
+#include <fstream>
+#include <sstream>
+#include <string>
+
+void GLClearError()
+{
+    while (glGetError() != GL_NO_ERROR);
+}
+
+bool GLCheckError()
+{
+    while (GLenum error = glGetError())
+    {
+        wxMessageBox(wxString::Format("[OpenGL error (%X)]", error));
+        return false;
+    }
+    return true;
+}
+
+void Renderer::Draw(const VertexArray& va, const IndexBuffer& ib, const Shader& shader) const
+{
+    // Set shader
+    shader.Bind();
+    //shader.SetUniform4f("u_Color", colourVec4[0], colourVec4[1], colourVec4[2], colourVec4[3]);
+
+    // Bind vertex array object
+    va.Bind();
+
+    // Bind index buffer
+    ib.Bind();
+
+    GLCall(glDrawElements(GL_TRIANGLES, ib.GetCount(), GL_UNSIGNED_INT, nullptr));
+}
+
+void Renderer::Clear()
+{
+    GLCall(glClear(GL_COLOR_BUFFER_BIT));
+}
+
+void Renderer::Ortho2D(float* mat, float left, float right, float bottom, float top)
+{
+    // this is basically from
+    // http://en.wikipedia.org/wiki/Orthographic_projection_(geometry)
+    const float zNear = -1.0f;
+    const float zFar = 1.0f;
+    const float inv_z = 1.0f / (zFar - zNear);
+    const float inv_y = 1.0f / (top - bottom);
+    const float inv_x = 1.0f / (right - left);
+
+    //first column
+    *mat++ = (2.0f * inv_x);
+    *mat++ = (0.0f);
+    *mat++ = (0.0f);
+    *mat++ = (0.0f);
+
+    //second
+    *mat++ = (0.0f);
+    *mat++ = (2.0 * inv_y);
+    *mat++ = (0.0f);
+    *mat++ = (0.0f);
+
+    //third
+    *mat++ = (0.0f);
+    *mat++ = (0.0f);
+    *mat++ = (-2.0f * inv_z);
+    *mat++ = (0.0f);
+
+    //fourth
+    *mat++ = (-(right + left) * inv_x);
+    *mat++ = (-(top + bottom) * inv_y);
+    *mat++ = (-(zFar + zNear) * inv_z);
+    *mat++ = (1.0f);
+}