#174878 - m2 - Wed Jul 28, 2010 12:55 pm
Hello, i have been playing around with 3D a bit, trying to get alpha blending to work, but there seems to be no way i can get rid of the flickering that seem to occur when i rotate my alpha blended cube.. I assume this might be some type of sorting problem, but i don't know how to solve it. Hope someone can help me out a bit in case there is something i have missed.
Here is the code:
Here is the code:
| Code: |
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#include <nds.h> int DrawGLScene(); float rot; int main() { // Setup the Main screen for 3D videoSetMode(MODE_0_3D); // initialize the geometry engine glInit(); glEnable(GL_BLEND); // setup the rear plane glClearColor(0,0,0,31); // BG must be opaque for AA to work glClearPolyID(63); // BG must have a unique polygon ID for AA to work glClearDepth(0x7FFF); // Set our viewport to be the same size as the screen glViewport(0,0,255,191); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(70, 256.0 / 192.0, 0.1, 100); while (1) { // Set the current matrix to be the model matrix glMatrixMode(GL_MODELVIEW); //Push our original Matrix onto the stack (save state) glPushMatrix(); DrawGLScene(); // Pop our Matrix from the stack (restore state) glPopMatrix(1); // flush to screen glFlush(0); // wait for the screen to refresh swiWaitForVBlank(); } return 0; } int DrawGLScene() // Here's Where We Do All The Drawing { glLoadIdentity(); // Reset The Current Modelview Matrix glTranslatef(0.0f,0.0f,-3.0f); // Move Left 1.5 Units And Into The Screen 6.0 glRotatef(rot,1.0f,1.0f,1.0f); // Rotate The Triangle On The Y axis ( NEW ) glPolyFmt(POLY_ID(0)|POLY_ALPHA(15) | POLY_CULL_NONE ); glBegin(GL_QUADS); glColor3f(0.0f,1.0f,0.0f); // Set The Color To Green glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top) glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top) glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top) glEnd(); glPolyFmt(POLY_ID(1)|POLY_ALPHA(15) | POLY_CULL_NONE ); glBegin(GL_QUADS); glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom) glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom) glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom) glEnd(); glPolyFmt(POLY_ID(2)|POLY_ALPHA(15) | POLY_CULL_NONE ); glBegin(GL_QUADS); glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front) glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front) glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front) glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front) glEnd(); glPolyFmt(POLY_ID(3)|POLY_ALPHA(15) | POLY_CULL_NONE ); glBegin(GL_QUADS); glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Back) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Back) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Back) glVertex3f( 1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Back) glEnd(); glPolyFmt(POLY_ID(4)|POLY_ALPHA(15) | POLY_CULL_NONE ); glBegin(GL_QUADS); glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left) glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left) glEnd(); glPolyFmt(POLY_ID(5)|POLY_ALPHA(15) | POLY_CULL_NONE ); glBegin(GL_QUADS); glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right) glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right) glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right) glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right) glEnd(); rot+=0.2f; // Increase The Rotation Variable For The Triangle ( NEW ) return TRUE; // Keep Going } |