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POSkybox in OpenGL
 

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  1. POSkybox in OpenGL
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    <p>I am working on an Environment Map for a skybox in OpenGL and have run into a problem with the textures. My code produces tiles of the texture that I am trying to map, rather than one big texture. The tiles have also lost most of their resolution and are very small. </p> <p>Here is my code: </p> <pre><code>#include &lt;windows.h&gt; #include &lt;stdio.h&gt; #include &lt;glew.h&gt; #include &lt;glut.h&gt; #include "Camera.h" Camera cam; GLuint texture [6]; //the array for our texture GLfloat angle = 0.0; GLuint LoadTexture( const char * filename, int width, int height) { GLuint texture; unsigned char * data; FILE* file; file = fopen( filename, "rb" ); if ( file == NULL ) return 0; data = (unsigned char *)malloc( width * height * 3 ); fread( data, width * height * 3, 1, file ); fclose( file ); glGenTextures( 1, &amp;texture ); glBindTexture( GL_TEXTURE_2D, texture ); glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR ); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR ); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT ); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT ); gluBuild2DMipmaps( GL_TEXTURE_2D, 3, width, height, GL_RGB, GL_UNSIGNED_BYTE, data ); free(data); return texture; } void FreeTexture( GLuint texture ) { glDeleteTextures( 1, &amp;texture ); } void skybox (void) { float x = 0; float y = 0; float z = 0; float width = 100; float height = 100; float length = 100; // Bind the BACK texture of the sky map to the BACK side of the cube glBindTexture(GL_TEXTURE_2D, texture[0]); // Center the skybox x = x - width / 2; y = y - height / 2; z = z - length / 2; glBegin(GL_QUADS); glTexCoord2f(1.0f, 0.0f); glVertex3f(x + width, y, z); glTexCoord2f(1.0f, 1.0f); glVertex3f(x + width, y + height, z); glTexCoord2f(0.0f, 1.0f); glVertex3f(x, y + height, z); glTexCoord2f(0.0f, 0.0f); glVertex3f(x, y, z); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[1]); glBegin(GL_QUADS); glTexCoord2f(1.0f, 0.0f); glVertex3f(x, y, z + length); glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y + height, z + length); glTexCoord2f(0.0f, 1.0f); glVertex3f(x + width, y + height, z + length); glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y, z + length); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[4]); glBegin(GL_QUADS); glTexCoord2f(1.0f, 0.0f); glVertex3f(x, y, z); glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y, z + length); glTexCoord2f(0.0f, 1.0f); glVertex3f(x + width, y, z + length); glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y, z); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[5]); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y + height, z); glTexCoord2f(1.0f, 0.0f); glVertex3f(x + width, y + height, z + length); glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y + height, z + length); glTexCoord2f(0.0f, 1.0f); glVertex3f(x, y + height, z); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[2]); glBegin(GL_QUADS); glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y + height, z); glTexCoord2f(0.0f, 1.0f); glVertex3f(x, y + height, z + length); glTexCoord2f(0.0f, 0.0f); glVertex3f(x, y, z + length); glTexCoord2f(1.0f, 0.0f); glVertex3f(x, y, z); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[3]); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y, z); glTexCoord2f(1.0f, 0.0f); glVertex3f(x + width, y, z + length); glTexCoord2f(1.0f, 1.0f); glVertex3f(x + width, y + height, z + length); glTexCoord2f(0.0f, 1.0f); glVertex3f(x + width, y + height, z); glEnd(); //glBindTexture( GL_TEXTURE_CUBE_MAP, texture[0] ); //bind the texture //glRotatef( angle, 1.0f, 1.0f, 1.0f ); //glutSolidSphere(2, 40, 40); } void display (void) { glClearColor (0.0,0.0,0.0,1.0); glClear (GL_COLOR_BUFFER_BIT); glLoadIdentity(); cam.camera(); //gluLookAt (20.0, 20.0, 20.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); texture[0] = LoadTexture( "Back.bmp", 256, 256 ); //load the texture texture[1] = LoadTexture( "Front.bmp", 256, 256 ); //load the texture texture[2] = LoadTexture( "Left.bmp", 256, 256 ); //load the texture texture[3] = LoadTexture( "Right.bmp", 256, 256 ); //load the texture texture[4] = LoadTexture( "Bottom.bmp", 256, 256 ); //load the texture texture[5] = LoadTexture( "Top.bmp", 256, 256 ); //load the texture glEnable(GL_TEXTURE_2D); //enable 2D texturing glEnable(GL_TEXTURE_GEN_S); //enable texture coordinate generation glEnable(GL_TEXTURE_GEN_T); skybox(); for (int i = 0; i &lt; 6; i++) { FreeTexture( texture[i] ); } glutSwapBuffers(); angle = angle + 0.5; cam.incAngle(); } void keyboard (unsigned char key, int x, int y) { switch (key) { case 'q': cam.lookUpwards(); break; case 'z': cam.lookDownwards(); break; case 'w': cam.slideForward(); break; case 's': cam.slideBackward(); break; case 'a': cam.strafeLeft(); break; case 'd': cam.strafeRight(); break; case 'e': exit(0); break; default: break; } } void reshape(int x, int y) { cam.reshape(x, y); } void mouseMovement(int x, int y) { cam.mouseMovement(x, y); } int main (int argc, char **argv) { glutInit(&amp;argc, argv); glutInitDisplayMode(GLUT_DOUBLE); glutInitWindowSize(500, 500); glutInitWindowPosition(100, 100); glutCreateWindow("A basic OpenGL Window"); glutDisplayFunc(display); glutIdleFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutPassiveMotionFunc(mouseMovement); glutMainLoop(); } </code></pre>
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    1. PO
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    1. USmsell
    1. USLukas Comstock
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    1. VO
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      1. POSkybox in OpenGL
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
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    3. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    1. COThis is fixed-function OpenGL, which is quite dated. Please consider using the programmable pipeline with shaders.
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      1. POSkybox in OpenGL
      1. USStephan van den Heuvel
    2. CO@StephanvandenHeuvel: Please consider replying to actual question instead of suggesting something OP doesn't need. Dated or not, fixed function has a lot of uses even today. Making a GL4 shader just to draw a skybox is overkill.
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      1. POSkybox in OpenGL
      1. USSigTerm
    3. COWhy is this question downvoted?
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      1. POSkybox in OpenGL
      1. USRohit Vipin Mathews
 

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