Big batch of changes, check description:

- Camera system moved to a separate module [camera.c]
- WIP: Added customization functions for camera controls
- Added custom shaders support on batch drawing
- Complete redesign of textures module to support multiple texture
formats (compressed and uncompressed)

examples/models_custom_shader.c

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+/*******************************************************************************************
+*
+*   raylib [models] example - Load and draw a 3d model (OBJ)
+*
+*   This example has been created using raylib 1.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014 Ramon Santamaria (Ray San - raysan@raysanweb.com)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 1280;
+    int screenHeight = 720;
+
+    InitWindow(screenWidth, screenHeight, "raylib [models] example - custom shader");
+    
+    // Define the camera to look into our 3d world
+    Camera camera = {{ 10.0, 8.0, 10.0 }, { 0.0, 0.0, 0.0 }, { 0.0, 1.0, 0.0 }};
+
+    Texture2D texture = LoadTexture("resources/catsham.png");   // Load model texture
+    Shader shader = LoadShader("resources/shaders/custom.vs", "resources/shaders/custom.fs");
+    //Shader poste = LoadShader("resources/shaders/custom.vs", "resources/shaders/pixel.fs");
+
+    Model cat = LoadModel("resources/cat.obj");                 // Load OBJ model
+
+    SetModelTexture(&cat, texture);                             // Bind texture to model
+    //SetModelShader(&cat, poste);
+
+    Vector3 catPosition = { 0.0, 0.0, 0.0 };                    // Set model position
+    
+    SetPostproShader(shader);
+
+    SetTargetFPS(60);   // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (IsKeyDown(KEY_LEFT)) catPosition.x -= 0.2;
+        if (IsKeyDown(KEY_RIGHT)) catPosition.x += 0.2;
+        if (IsKeyDown(KEY_UP)) catPosition.z -= 0.2;
+        if (IsKeyDown(KEY_DOWN)) catPosition.z += 0.2;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            Begin3dMode(camera);
+
+                DrawModel(cat, catPosition, 0.1f, WHITE);   // Draw 3d model with texture
+
+                DrawGrid(10.0, 1.0);        // Draw a grid
+
+                DrawGizmo(catPosition);     // Draw gizmo
+
+            End3dMode();
+
+            DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadTexture(texture);     // Unload texture
+    UnloadModel(cat);           // Unload model
+    UnloadShader(shader);
+    //UnloadShader(poste);
+
+    CloseWindow();              // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/resources/shaders/base.vs

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+#version 110
+
+attribute vec3 vertexPosition;
+attribute vec2 vertexTexCoord;
+attribute vec4 vertexColor;
+
+uniform mat4 projectionMatrix;
+uniform mat4 modelviewMatrix;
+
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+void main()
+{
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+    
+    gl_Position = projectionMatrix*modelviewMatrix*vec4(vertexPosition, 1.0);
+}

examples/resources/shaders/custom.fs

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+#version 330
+
+uniform sampler2D texture0;
+varying vec2 fragTexCoord;
+
+uniform vec4 tintColor;
+
+void main()
+{
+    vec4 base = texture2D(texture0, fragTexCoord)*tintColor;
+    
+    // Convert to grayscale using NTSC conversion weights
+    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
+    
+    gl_FragColor = vec4(gray, gray, gray, tintColor.a);
+}

examples/resources/shaders/custom.vs

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+#version 330
+
+attribute vec3 vertexPosition;
+attribute vec2 vertexTexCoord;
+attribute vec3 vertexNormal;
+
+uniform mat4 projectionMatrix;
+uniform mat4 modelviewMatrix;
+
+varying vec2 fragTexCoord;
+
+void main()
+{
+    fragTexCoord = vertexTexCoord;
+    gl_Position = projectionMatrix*modelviewMatrix*vec4(vertexPosition, 1.0);
+}

examples/resources/shaders/grayscale.fs

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+#version 110
+
+uniform sampler2D texture0;
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+void main()
+{
+    vec4 base = texture2D(texture0, fragTexCoord)*fragColor;
+
+    // Convert to grayscale using NTSC conversion weights
+    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
+    
+    gl_FragColor = vec4(gray, gray, gray, base.a);
+}