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Add DevIL 1.7.8.
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rude
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//-----------------------------------------------------------------------------
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//
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// ImageLib GL Test Source
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// Copyright (C) 2000-2002 by Denton Woods
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// Last modified: 05/17/2002 <--Y2K Compliant! =]
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//
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// Filename: examples/gl example/gl example.c
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//
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// Description: Sample implementation of an OpenGL image viewer.
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//
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//-----------------------------------------------------------------------------
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//
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// We use FreeGlut in Windows, because it's more stable.
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//
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#ifdef _WIN32
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#include <GL/freeglut.h>
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#else
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#include <GL/glut.h>
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#endif
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#ifdef _DEBUG
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#define IL_DEBUG
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#endif//_DEBUG
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#define ILUT_USE_OPENGL
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#include <IL/il.h>
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#include <IL/ilu.h>
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#include <IL/ilut.h>
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#include "gltest.h"
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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//
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// Easier to do this than change the project's settings in MSVC++. (I'm lazy!)
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//
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#ifdef _MSC_VER
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#pragma comment(lib, "freeglut.lib")
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// Prevent the console window from popping up.
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//#pragma comment(linker, "/entry:mainCRTStartup")
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//#pragma comment(linker, "/subsystem:windows")
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#endif
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char *FileName;
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ILuint Width, Height, window;
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void HandleDevILErrors ()
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{
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ILenum error = ilGetError ();
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if (error != IL_NO_ERROR) {
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do {
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printf ("\n\n%s\n", iluErrorString (error));
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} while ((error = ilGetError ()));
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exit (1);
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}
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}
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extern int main(int argc, char** argv);
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int main(int argc, char** argv)
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{
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// No filename is specified on the command-line.
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if (argc < 2) {
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printf ("Please run as:\n\nDevIL_testGL image_filename\n");
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return 1;
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}
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FileName = argv[1]; // Set filename equal to the first argument.
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//
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// Check if the shared lib's version matches the executable's version.
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//
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//
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// fixed to get the right numbers from the right library call...
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//
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if (ilGetInteger(IL_VERSION_NUM) < IL_VERSION ||
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iluGetInteger(ILU_VERSION_NUM) < ILU_VERSION ||
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ilutGetInteger(ILUT_VERSION_NUM) < ILUT_VERSION) {
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printf ("DevIL library is out of date! Please upgrade\n");
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return 2;
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}
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// Needed to initialize DevIL.
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ilInit ();
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iluInit();
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// GL cannot use palettes anyway, so convert early.
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ilEnable (IL_CONV_PAL);
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// Gets rid of dithering on some nVidia-based cards.
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ilutEnable (ILUT_OPENGL_CONV);
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// Generate the main image name to use.
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ilGenImages (1, &ImgId);
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// Bind this image name.
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ilBindImage (ImgId);
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// Loads the image specified by File into the ImgId image.
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if (!ilLoadImage (FileName)) {
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HandleDevILErrors ();
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}
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// Make sure the window is in the same proportions as the image.
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// Generate the appropriate width x height less than or equal to MAX_X x MAX_Y.
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// Instead of just clipping Width x Height to MAX_X x MAX_Y, we scale to
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// an appropriate size, so the image isn't stretched/squished.
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Width = ilGetInteger (IL_IMAGE_WIDTH);
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Height = ilGetInteger (IL_IMAGE_HEIGHT);
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if (Width > 0) { // Don't want a divide by 0...
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if (Width > MAX_X) {
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Width = MAX_X;
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Height = (ILuint)(MAX_X / (ILfloat)ilGetInteger(IL_IMAGE_WIDTH) * Height);
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}
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}
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if (Height > 0) { // Don't want a divide by 0...
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if (Height > MAX_Y) {
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Height = MAX_Y;
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Width = (ILuint)(MAX_Y / (ILfloat)ilGetInteger(IL_IMAGE_HEIGHT) * Width);
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}
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}
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HandleDevILErrors ();
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// Standard glut initializations.
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glutInit (&argc, argv); // Standard glut initialization.
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glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE);
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glutInitWindowPosition (100, 100);
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glutInitWindowSize (Width, Height);
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window = glutCreateWindow("Developer's Image Library (DevIL) Test");
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ilutInit();
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glutDisplayFunc (DisplayFunc);
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glutKeyboardFunc (KeyboardFunc);
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// Goes into our setup function.
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if (Setup() == IL_FALSE)
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return 1;
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// Enter the main (Free)GLUT processing loop
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glutMainLoop();
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// Clean up any loose ends.
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CleanUp();
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return 0;
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}
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//
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// Standard glut resize function.
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//
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void ResizeFunc(int NewWidth, int NewHeight)
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{
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glMatrixMode (GL_PROJECTION);
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glLoadIdentity ();
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glViewport (0, 0, NewWidth, NewHeight);
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glOrtho (0, Width, Height, 0, -1, 1);
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}
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//
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// Standard glut display function.
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//
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void DisplayFunc()
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{
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glClear(GL_COLOR_BUFFER_BIT); // Clear the colour buffer.
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// Texture a quad with our image that fills the entire window.
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glBindTexture (GL_TEXTURE_2D, TexID);
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glBegin (GL_QUADS);
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/*glTexCoord2f (0.0f, 0.0f); glVertex3i (0, 0, 0);
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glTexCoord2f (1.0f, 0.0f); glVertex3i (Width, 0, 0);
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glTexCoord2f (1.0f, 1.0f); glVertex3i (Width, Height, 0);
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glTexCoord2f (0.0f, 1.0f); glVertex3i (0, Height, 0);*/
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glTexCoord2f (0.0f, 1.0f); glVertex3i (0, 0, 0);
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glTexCoord2f (1.0f, 1.0f); glVertex3i (Width, 0, 0);
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glTexCoord2f (1.0f, 0.0f); glVertex3i (Width, Height, 0);
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glTexCoord2f (0.0f, 0.0f); glVertex3i (0, Height, 0);
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glEnd();
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glutSwapBuffers(); // We use double buffering, so swap the buffers.
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}
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//
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// Standard glut idle function
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//
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void IdleFunc()
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{
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glutShowWindow ();
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glutPostRedisplay ();
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}
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//
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// Any keypress closes the window - standard glut keypress function.
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//
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void KeyboardFunc(unsigned char cChar, int nMouseX, int nMouseY)
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{
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CleanUp(); // Clean up OpenGL.
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glutDestroyWindow(window); // Destroy the window.
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#ifndef _WIN32
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// Must use this with regular glut, since it never returns control to main().
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exit(0);
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#endif
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}
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//
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// Setup OpenGL to use our image.
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//
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ILboolean Setup()
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{
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glEnable (GL_TEXTURE_2D); // Enable texturing.
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glMatrixMode (GL_PROJECTION); // We want to use the projection matrix.
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glLoadIdentity (); // Loads the identity matrix into the current matrix.
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// Lets ILUT know to use its OpenGL functions.
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ilutRenderer (ILUT_OPENGL);
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// Goes through all steps of sending the image to OpenGL.
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TexID = ilutGLBindTexImage();
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// We're done with our image, so we go ahead and delete it.
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ilDeleteImages(1, &ImgId);
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glOrtho(0, Width, Height, 0, -1, 1); // Set up an orthographic projection with OpenGL.
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return IL_TRUE;
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}
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//
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// Cleans up any loose ends.
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//
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void CleanUp()
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{
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if (!bCleaned) // Can only delete the texture once.
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glDeleteTextures (1, &TexID); // Delete our OpenGL texture.
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bCleaned = IL_TRUE; // Want to make sure we only delete it once.
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}
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@@ -0,0 +1,36 @@
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//-----------------------------------------------------------------------------
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//
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// ImageLib GL Test Source
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// Copyright (C) 2000-2002 by Denton Woods
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// Last modified: 10/13/2000 <--Y2K Compliant! =]
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//
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// Filename: examples/gl example/gl example.h
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//
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// Description: Sample implementation of an OpenGL image viewer.
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//
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//-----------------------------------------------------------------------------
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#ifndef GLTEST_H
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#define GLTEST_H
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// We don't want a larger window than this.
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#define MAX_X 640
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#define MAX_Y 480
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// Function prototypes.
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void DisplayFunc(void);
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void CleanUp(void);
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void ResizeFunc(int NewWidth, int NewHeight);
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void IdleFunc(void);
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void KeyboardFunc(unsigned char cChar, int nMouseX, int nMouseY);
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ILboolean Setup();
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// Has the main GL texture been deleted?
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ILboolean bCleaned = 0;
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// GL texture ID
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GLuint TexID = 0;
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// IL image ID
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ILuint ImgId = 0;
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#endif//GLTEST_H
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