| 1 | /*
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| 2 | * ----------------------------------------------------------------------
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| 3 | * Texture3d.cpp: 3d texture class
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| 4 | *
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| 5 | * ======================================================================
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| 6 | * AUTHOR: Wei Qiao <qiaow@purdue.edu>
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| 7 | * Purdue Rendering and Perceptualization Lab (PURPL)
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| 8 | *
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| 9 | * Copyright (c) 2004-2006 Purdue Research Foundation
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| 10 | *
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| 11 | * See the file "license.terms" for information on usage and
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| 12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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| 13 | * ======================================================================
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| 14 | */
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| 15 | #ifdef WIN32
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| 16 | #include <windows.h>
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| 17 | #endif
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| 18 |
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| 19 | #include "Texture3D.h"
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| 20 | #include <stdio.h>
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| 21 | #include <assert.h>
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| 22 | #include <math.h>
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| 23 |
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| 24 |
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| 25 | Texture3D::Texture3D(){ id=-1; gl_resource_allocated = false; }
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| 26 |
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| 27 | Texture3D::Texture3D(int width, int height, int depth, int type, int interp, int components)
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| 28 | {
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| 29 | assert(type == GL_UNSIGNED_BYTE || type == GL_FLOAT|| type ==GL_UNSIGNED_INT);
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| 30 |
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| 31 | this->width = width;
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| 32 | this->height = height;
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| 33 | this->depth = depth;
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| 34 |
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| 35 | int m = (width > height) ? width : height;
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| 36 | m = (m > depth) ? m : depth;
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| 37 |
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| 38 | //int m = max(max(width, height), depth);
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| 39 | this->aspect_ratio_width = (double)width/(double)m;
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| 40 | this->aspect_ratio_height = (double)height/(double)m;
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| 41 | this->aspect_ratio_depth = (double)depth/(double)m;
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| 42 |
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| 43 | this->type = type;
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| 44 | this->interp_type = interp;
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| 45 | this->n_components = components;
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| 46 |
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| 47 | id = -1;
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| 48 | gl_resource_allocated = false;
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| 49 | }
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| 50 |
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| 51 | GLuint Texture3D::load_tex_data(float *data)
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| 52 | {
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| 53 | //load texture with 16 bit half floating point precision
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| 54 | //half float with linear interpolation is only supported by 6 series and up cards
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| 55 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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| 56 |
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| 57 | glGenTextures(1, &id);
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| 58 | glBindTexture(GL_TEXTURE_3D, id);
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| 59 | assert(id!=-1);
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| 60 |
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| 61 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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| 62 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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| 63 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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| 64 |
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| 65 | if(interp_type==GL_LINEAR){
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| 66 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 67 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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| 68 | }
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| 69 | else{
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| 70 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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| 71 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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| 72 | }
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| 73 |
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| 74 | switch(n_components){
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| 75 | case 1:
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| 76 | glTexImage3D(GL_TEXTURE_3D, 0, GL_LUMINANCE16F_ARB, width, height, depth, 0, GL_LUMINANCE, GL_FLOAT, data);
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| 77 | break;
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| 78 | case 2:
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| 79 | glTexImage3D(GL_TEXTURE_3D, 0, GL_LUMINANCE_ALPHA16F_ARB, width, height, depth, 0, GL_LUMINANCE_ALPHA, GL_FLOAT, data);
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| 80 | break;
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| 81 | case 3:
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| 82 | glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB16F_ARB, width, height, depth, 0, GL_RGB, GL_FLOAT, data);
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| 83 | break;
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| 84 | case 4:
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| 85 | glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA16F_ARB, width, height, depth, 0, GL_RGBA, GL_FLOAT, data);
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| 86 | break;
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| 87 | default:
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| 88 | break;
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| 89 | }
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| 90 | assert(glGetError()==0);
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| 91 |
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| 92 | gl_resource_allocated = true;
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| 93 | return id;
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| 94 | }
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| 95 |
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| 96 | void Texture3D::activate()
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| 97 | {
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| 98 | glEnable(GL_TEXTURE_3D);
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| 99 | glBindTexture(GL_TEXTURE_3D, id);
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| 100 | }
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| 101 |
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| 102 | void Texture3D::deactivate()
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| 103 | {
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| 104 | glDisable(GL_TEXTURE_3D);
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| 105 | }
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| 106 |
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| 107 | Texture3D::~Texture3D()
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| 108 | {
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| 109 | glDeleteTextures(1, &id);
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| 110 | }
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| 111 |
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| 112 | void Texture3D::check_max_size(){
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| 113 | GLint max = 0;
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| 114 | glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE_EXT, &max);
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| 115 |
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| 116 | //printf("%d", glGetError());
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| 117 | fprintf(stderr, "max 3d texture size: %d\n", max);
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| 118 | }
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| 119 |
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| 120 | void Texture3D::check_max_unit(){
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| 121 | int max;
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| 122 | glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &max);
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| 123 |
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| 124 | fprintf(stderr, "max texture units: %d.\n", max);
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| 125 | }
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