36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
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//-----------------------------------------------------------------------------
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// Offscreen rendering in OpenGL using framebuffer objects.
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//
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// Copyright 2015 <whitequark@whitequark.org>
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//-----------------------------------------------------------------------------
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#ifndef __GLOFFSCREEN_H
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#define __GLOFFSCREEN_H
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#include <stdint.h>
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class GLOffscreen {
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public:
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/* these allocate and deallocate OpenGL resources.
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an OpenGL context /must/ be current. */
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GLOffscreen();
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~GLOffscreen();
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/* prepare for drawing a frame of specified size.
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returns true if OpenGL likes our configuration, false
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otherwise. if it returns false, the OpenGL state is restored. */
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bool begin(int width, int height);
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/* get pixels out of the frame and restore OpenGL state.
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the pixel format is ARGB32 with top row at index 0.
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the returned array is valid until the next call to begin() */
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uint8_t *end();
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private:
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unsigned int _framebuffer;
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unsigned int _color_renderbuffer, _depth_renderbuffer;
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uint32_t *_pixels, *_pixels_inv;
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int _width, _height;
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};
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#endif
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