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POGL_UNSIGNED_SHORT_5_6_5 undeclared?
 

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    <p>I have a problem loading a texture using SDL library.</p> <p>Usually I make programs on Linux but I try to create a code that is compatible with Visual Studio also. On Linux are everything OK but on Visual Studio it crashes in "GL_UNSIGNED_SHORT_5_6_5" in the glTexImage2D(...) function.</p> <p>Below is a general idea about what i want to do which I inspired by <a href="http://www.youtube.com/watch?v=dxQY02g3I6g" rel="nofollow">this</a> tutorial:</p> <pre><code>#include "stdafx.h" #include &lt;stdlib.h&gt; #include &lt;stdio.h&gt; #include &lt;GL/glut.h&gt; //#include &lt;GL/glext.h&gt; #include "SDL.h" int brick; float c=0.5; float rx_min=0, ry_min=0; float rx_max=1, ry_max=1; unsigned int LoadTexture(const char* filename); void DrawTexture(int object); void setupmywindow(); void myDrawing(); void setupmywindow() { glClearColor(1.0,1.0,1.0,0); glColor3f(0.0, 0.0, 0.0); glPolygonMode(GL_FRONT_AND_BACK,GL_FILL); gluOrtho2D(rx_min,ry_min, rx_max, ry_max); brick = LoadTexture("brick.bmp"); } void DrawTexture(int object) { glBindTexture(GL_TEXTURE_2D, object); glColor3f(c,c,c); glBegin(GL_QUADS); glTexCoord2f(0., 1. ); glVertex2f( rx_min , ry_min ); glTexCoord2f(0., 0. ); glVertex2f( rx_min, ry_max ); glTexCoord2f(1., 0. ); glVertex2f( rx_max , ry_max ); glTexCoord2f(1., 1. ); glVertex2f( rx_max , ry_min ); glEnd(); } unsigned int LoadTexture(const char* filename) { SDL_Surface* img=SDL_LoadBMP(filename); unsigned int id; glGenTextures(1, &amp;id); glBindTexture(GL_TEXTURE_2D,id); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img-&gt;w, img-&gt;h, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, img-&gt;pixels); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); SDL_FreeSurface(img); return id; } void myDrawing() { glClear(GL_COLOR_BUFFER_BIT); DrawTexture(brick); glFlush(); } int main(int argc, char **argv) { printf("AUTH Computational Physics - Computer Graphics\n"); printf("Project &gt;&gt;TestTexture.cpp\n"); printf("--------------------------------------------------------\n"); glutInit(&amp;argc, argv); glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutInitWindowPosition(50,50); glutCreateWindow("Texture Test"); setupmywindow(); glutDisplayFunc(myDrawing); glutMainLoop(); return 0; } </code></pre> <p>The error is: </p> <blockquote> <p>error C2065: 'GL_UNSIGNED_SHORT_5_6_5' : undeclared identifier</p> </blockquote> <p><a href="https://dl.dropboxusercontent.com/u/89389295/brick.bmp" rel="nofollow">Here</a> is the image that I try to load and it is configured as a bitmap (8bit 5 6 5) with GIMP 2.8</p> <p><strong>NOTE</strong>: When I uncoment <em>#include &lt; GL/glext.h ></em> which is not needed on Linux, I get the above message: Unhandled exception at 0x00d1193f in testTesxture.exe: 0xC0000005: Access violation reading location 0x00000014.</p> <p>Generally if I save a bitmap image (for example with paint) how can I uderstand the type I have to put (GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_BYTE etc)?</p>
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    1. COWhy do you have `#include <GL/glext.h> ` commented out?
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    2. COSorry, I should uncomment it. It compiles but with this result : Unhandled exception at 0x00d1193f in testTesxture.exe: 0xC0000005: Access violation reading location 0x00000014.
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