OpenGL To PixMap And Then to Max2d

BlitzMax Forums/BlitzMax Programming/OpenGL To PixMap And Then to Max2d

Haramanai (Posted 2005) [#1]

Sorry for the big title. But it explains the idia. I don't know how to create a box Code so here it is bglCreateContext 640,480,16,0,BGL_BACKBUFFER glMatrixMode GL_PROJECTION glLoadIdentity glFrustum -0.1, 0.1,-0.1, 0.1, 0.1, 100.0 glMatrixMode GL_MODELVIEW glLoadIdentity glClear GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_FRAME_BUFFER_BIT glLoadIdentity glTranslatef 0.0 , 2.0 , -6.0 glBegin GL_QUADS glColor3f 0.0 , 0.5 , 0.5 glVertex3f 5.0, 1.0, 0.0 glColor3f 1.0 , 0.0 , 0.5 glVertex3f 1.0, 1.0, 0.0 glColor3f 0.0 , 0.5 , 1.0 glVertex3f 10.0,-10.0, 0.0 glColor3f 1.0 , 0.0 , 0.0 glVertex3f-10.0,-10.0,0.0 glEnd Global pixMap:TPixMap = CreatePixmap(640 , 480 , PF_RGB888) Global i_ptr:Byte Ptr=PixmapPixelPtr(pixMap) bglDrawText "This Will Take No Time..." , 10 , 10 bglDrawText "When It will Finish press Space To go to Max2d" , 10 , 50 bglSwapBuffers glReadBuffer(GL_FRONT) glReadPixels(0 , 0 , 640 , 480 , GL_RGB , GL_UNSIGNED_BYTE , i_ptr) pixmap = YFlipPixmap(pixMap) While Not KeyDown(Key_Space) Wend bglDeleteContext Graphics 640 , 480 , 32 While Not KeyDown(Key_EScape) Cls DrawPixmap pixmap , 0 , 0 DrawText "Press Escape To Exit" , 10 , 100 Flip FlushMem Wend

Shagwana (Posted 2005) [#2]

I edited your post so your now in a code box.

Haramanai (Posted 2005) [#3]

Thanks For the tip.

Hotcakes (Posted 2005) [#4]

EDIT : That's better! =]

ImaginaryHuman (Posted 2005) [#5]

To use glReadPixels there other related OpenGl parameters that need to be set up to determine that the transfer works correctly.

Haramanai (Posted 2005) [#6]

I tryed to use it so to grab all the window at once and take the RGB but it was just crashing.

ImaginaryHuman (Posted 2005) [#7]

There are other commands you have to call first to set up the date transfer properly.