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/resources/shaders/base.vs

@@ -0,0 +1,19 @@
+#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

@@ -0,0 +1,16 @@
+#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

@@ -0,0 +1,16 @@
+#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

@@ -0,0 +1,15 @@
+#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);
+}