objective c - OpenGL ES drawing with and without CCRenderTexture -


i know can draw opengl graphics ccrendertexture:

ccrendertexture *rt = [ccrendertexture rendertexturewithwidth:texturewidth height:textureheight]; [rt beginwithclear:1, 1, 1, 1];  // opengl drawing ...... ccglenablevertexattribs(kccvertexattribflag_position | kccvertexattribflag_color); glvertexattribpointer(kccvertexattrib_position, 2, gl_float, gl_false, 0, vertices); glvertexattribpointer(kccvertexattrib_color, 4, gl_float, gl_false, 0, colors); glblendfunc(cc_blend_src, cc_blend_dst); gldrawarrays(gl_triangle_strip, 0, (glsizei)nvertices);  [rt end];

without ccrendertexture, seems ok, too:

// opengl drawing ...... ccglenablevertexattribs(kccvertexattribflag_position | kccvertexattribflag_color); glvertexattribpointer(kccvertexattrib_position, 2, gl_float, gl_false, 0, vertices); glvertexattribpointer(kccvertexattrib_color, 4, gl_float, gl_false, 0, colors); glblendfunc(cc_blend_src, cc_blend_dst); gldrawarrays(gl_triangle_strip, 0, (glsizei)nvertices);

what difference opengl drawing , without ccrendertexture?


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