polyplex.core.content.gl.textures source code

1 module polyplex.core.content.gl.textures;
2 import polyplex.core.content.textures;
3 import derelict.opengl;
4 import derelict.opengl.gl;
5 import polyplex.utils.logging;
6 import polyplex.core.render;
7 import polyplex.core.render.gl.shader;
8 import polyplex.core.color;
9 import std.stdio;
10 
11 
12 public class GlTexture2D : Texture2D {
13 	private GLuint id;
14 
15 	private static int MAX_TEX_UNITS = -1;
16 
17 	this(TextureImg img) {
18 		super(img);
19 	}
20 
21 	this(Color[][] colors) {
22 		super(colors);
23 	}
24 
25 	~this() {
26 		glDeleteTextures(1, &id);
27 	}
28 
29 	/**
30 		Binds the texture.	
31 	*/
32 	public override void Bind(int attach_pos = 0, Shader s = null) {
33 		if (s is null) {
34 			glBindTexture(GL_TEXTURE_2D, id);
35 			return;
36 		}
37 		if (!s.HasUniform("ppTexture")) throw new Exception("Texture2D requires ppTexture sampler2d uniform to attach to!");
38 		int tpos = GL_TEXTURE0+attach_pos;
39 
40 		if (tpos > MAX_TEX_UNITS) tpos = MAX_TEX_UNITS;
41 		if (tpos < GL_TEXTURE0) tpos = GL_TEXTURE0;
42 		glActiveTexture(tpos);
43 		glBindTexture(GL_TEXTURE_2D, id);
44 	}
45 
46 	/**
47 		Unbinds the texture.
48 	*/
49 	public override void Unbind() {
50 		glBindTexture(GL_TEXTURE_2D, 0);
51 	}
52 
53 	protected override void rebuffer() {
54 		int mode = GL_RGBA;
55 
56 		// Delete the current version of the texture in memory, if any.
57 		if (id != 0) glDeleteTextures(1, &id);
58 
59 		// Reallow GL_RGB again in the future?
60 		/*if (img.Surface.format.BytesPerPixel == 3) {
61 			mode = GL_RGB;
62 		}*/
63 
64 		// Generate a new texture over the old one, if any. Else just generate a new one and assign id.
65 		glGenTextures(1, &id);
66 		Bind();
67 		glTexImage2D(GL_TEXTURE_2D, 0, mode, image.Width, image.Height, 0, mode, GL_UNSIGNED_BYTE, image.Pixels.ptr);
68 		Unbind();
69 
70 		// Set max texture units.
71 		if (MAX_TEX_UNITS == -1) {
72 			glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &MAX_TEX_UNITS);
73 			Logger.Info("Set max texture units to: {0}", MAX_TEX_UNITS);
74 		}
75 	}
76 }