1 /* 2 Copyright (c) 2017-2018 Timur Gafarov 3 4 Boost Software License - Version 1.0 - August 17th, 2003 5 Permission is hereby granted, free of charge, to any person or organization 6 obtaining a copy of the software and accompanying documentation covered by 7 this license (the "Software") to use, reproduce, display, distribute, 8 execute, and transmit the Software, and to prepare derivative works of the 9 Software, and to permit third-parties to whom the Software is furnished to 10 do so, all subject to the following: 11 12 The copyright notices in the Software and this entire statement, including 13 the above license grant, this restriction and the following disclaimer, 14 must be included in all copies of the Software, in whole or in part, and 15 all derivative works of the Software, unless such copies or derivative 16 works are solely in the form of machine-executable object code generated by 17 a source language processor. 18 19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 22 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 23 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 24 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 25 DEALINGS IN THE SOFTWARE. 26 */ 27 28 module dagon.graphics.texture; 29 30 import std.stdio; 31 import std.math; 32 33 import dlib.core.memory; 34 import dlib.image.color; 35 import dlib.image.image; 36 import dlib.image.hdri; 37 import dlib.math.vector; 38 39 import dagon.core.libs; 40 import dagon.core.ownership; 41 42 class Texture: Owner 43 { 44 SuperImage image; 45 46 GLuint tex; 47 GLenum format; 48 GLint intFormat; 49 GLenum type; 50 51 int width; 52 int height; 53 int numMipmapLevels; 54 55 Vector2f translation; 56 Vector2f scale; 57 float rotation; 58 59 bool useMipmapFiltering = true; 60 bool useLinearFiltering = true; 61 62 protected bool mipmapGenerated = false; 63 64 this(Owner o) 65 { 66 super(o); 67 translation = Vector2f(0.0f, 0.0f); 68 scale = Vector2f(1.0f, 1.0f); 69 rotation = 0.0f; 70 } 71 72 this(SuperImage img, Owner o, bool genMipmaps = false) 73 { 74 super(o); 75 translation = Vector2f(0.0f, 0.0f); 76 scale = Vector2f(1.0f, 1.0f); 77 rotation = 0.0f; 78 createFromImage(img, genMipmaps); 79 } 80 81 void createFromImage(SuperImage img, bool genMipmaps = true) 82 { 83 releaseGLTexture(); 84 85 image = img; 86 width = img.width; 87 height = img.height; 88 89 if (!pixelFormatToTextureFormat(cast(PixelFormat)img.pixelFormat, format, intFormat, type)) 90 writefln("Unsupported pixel format %s", img.pixelFormat); 91 92 glGenTextures(1, &tex); 93 glActiveTexture(GL_TEXTURE0); 94 glBindTexture(GL_TEXTURE_2D, tex); 95 96 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); 97 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); 98 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 99 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); 100 101 //if (DerelictGL.isExtSupported("GL_EXT_texture_filter_anisotropic")) 102 // glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 16.0f); 103 104 glTexImage2D(GL_TEXTURE_2D, 0, intFormat, width, height, 0, format, type, cast(void*)img.data.ptr); 105 106 useMipmapFiltering = genMipmaps; 107 if (useMipmapFiltering) 108 { 109 glGenerateMipmap(GL_TEXTURE_2D); 110 mipmapGenerated = true; 111 } 112 113 glBindTexture(GL_TEXTURE_2D, 0); 114 } 115 116 void bind() 117 { 118 if (glIsTexture(tex)) 119 { 120 glBindTexture(GL_TEXTURE_2D, tex); 121 122 if (!mipmapGenerated && useMipmapFiltering) 123 { 124 glGenerateMipmap(GL_TEXTURE_2D); 125 mipmapGenerated = true; 126 } 127 128 if (useMipmapFiltering) 129 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); 130 else if (useLinearFiltering) 131 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 132 else 133 { 134 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 135 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 136 } 137 } 138 } 139 140 void unbind() 141 { 142 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); 143 glBindTexture(GL_TEXTURE_2D, 0); 144 } 145 146 bool valid() 147 { 148 return cast(bool)glIsTexture(tex); 149 } 150 151 Color4f sample(float u, float v) 152 { 153 if (image) 154 { 155 int x = cast(int)floor(u * width); 156 int y = cast(int)floor(v * height); 157 return image[x, y]; 158 } 159 else 160 return Color4f(0, 0, 0, 0); 161 } 162 163 void release() 164 { 165 releaseGLTexture(); 166 if (image) 167 { 168 Delete(image); 169 image = null; 170 } 171 } 172 173 void releaseGLTexture() 174 { 175 if (glIsTexture(tex)) 176 glDeleteTextures(1, &tex); 177 } 178 179 ~this() 180 { 181 release(); 182 } 183 } 184 185 bool pixelFormatToTextureFormat(uint pixelFormat, out GLenum textureFormat, out GLint textureInternalFormat, out GLenum pixelType) 186 { 187 switch (pixelFormat) 188 { 189 case PixelFormat.L8: textureInternalFormat = GL_R8; textureFormat = GL_RED; pixelType = GL_UNSIGNED_BYTE; break; 190 case PixelFormat.LA8: textureInternalFormat = GL_RG8; textureFormat = GL_RG; pixelType = GL_UNSIGNED_BYTE; break; 191 case PixelFormat.RGB8: textureInternalFormat = GL_RGB8; textureFormat = GL_RGB; pixelType = GL_UNSIGNED_BYTE; break; 192 case PixelFormat.RGBA8: textureInternalFormat = GL_RGBA8; textureFormat = GL_RGBA; pixelType = GL_UNSIGNED_BYTE; break; 193 case FloatPixelFormat.RGBAF32: textureInternalFormat = GL_RGBA32F; textureFormat = GL_RGBA; pixelType = GL_FLOAT; break; 194 default: 195 return false; 196 } 197 198 return true; 199 }