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Use constants for attribute locations

--- a/src/Backends/Rendering/OpenGL3.cpp

+++ b/src/Backends/Rendering/OpenGL3.cpp

@@ -19,6 +19,9 @@

 #define TOTAL_VBOS 2

+#define ATTRIBUTE_INPUT_VERTEX_COORDINATES 1

+#define ATTRIBUTE_INPUT_TEXTURE_COORDINATES 2

+

 typedef enum RenderMode

 {

 	MODE_BLANK,

@@ -326,8 +329,8 @@

 	glAttachShader(program_id, fragment_shader);

-	glBindAttribLocation(program_id, 1, "input_vertex_coordinates");

-	glBindAttribLocation(program_id, 2, "input_texture_coordinates");

+	glBindAttribLocation(program_id, ATTRIBUTE_INPUT_VERTEX_COORDINATES, "input_vertex_coordinates");

+	glBindAttribLocation(program_id, ATTRIBUTE_INPUT_TEXTURE_COORDINATES, "input_texture_coordinates");

 	glLinkProgram(program_id);

@@ -364,8 +367,8 @@

 	static unsigned int current_vertex_buffer = 0;

 	glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_ids[current_vertex_buffer]);

-	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, vertex_coordinate));

-	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, texture_coordinate));

+	glVertexAttribPointer(ATTRIBUTE_INPUT_VERTEX_COORDINATES, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, vertex_coordinate));

+	glVertexAttribPointer(ATTRIBUTE_INPUT_TEXTURE_COORDINATES, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, texture_coordinate));

 	if (local_vertex_buffer_size > vertex_buffer_size[current_vertex_buffer])

 	{

-- 

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