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/*************************************************************************
* Copyright (C) 2009-2011 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* OpenGL import/export.
*/
#include "dimension.h"
#include <GL/gl.h>
#include <stdlib.h>
#include <stdint.h>
/** GL optimizer callback. */
static void
dmnsn_gl_optimizer_fn(const dmnsn_canvas *canvas,
dmnsn_canvas_optimizer optimizer, size_t x, size_t y)
{
GLushort *pixel = (GLushort *)optimizer.ptr + 4*(y*canvas->width + x);
dmnsn_color color = dmnsn_canvas_get_pixel(canvas, x, y);
color = dmnsn_remove_filter(color);
color = dmnsn_color_to_sRGB(color);
color = dmnsn_color_saturate(color);
pixel[0] = lround(color.R*UINT16_MAX);
pixel[1] = lround(color.G*UINT16_MAX);
pixel[2] = lround(color.B*UINT16_MAX);
pixel[3] = lround(color.trans*UINT16_MAX);
}
/* Optimize canvas for GL drawing */
int
dmnsn_gl_optimize_canvas(dmnsn_canvas *canvas)
{
/* Check if we've already optimized this canvas */
DMNSN_ARRAY_FOREACH (dmnsn_canvas_optimizer *, i, canvas->optimizers) {
if (i->optimizer_fn == dmnsn_gl_optimizer_fn) {
return 0;
}
}
dmnsn_canvas_optimizer optimizer;
optimizer.optimizer_fn = dmnsn_gl_optimizer_fn;
optimizer.free_fn = dmnsn_free;
/* Allocate a buffer to hold RGB values */
optimizer.ptr = dmnsn_malloc(4*canvas->width*canvas->height*sizeof(GLushort));
/* Set a new optimizer */
dmnsn_canvas_optimize(canvas, optimizer);
return 0;
}
/* Write canvas to GL framebuffer. Returns 0 on success, nonzero on failure */
int
dmnsn_gl_write_canvas(const dmnsn_canvas *canvas)
{
GLushort *pixels; /* Array of 16-bit ints in RGBA order */
GLushort *pixel;
dmnsn_color color;
size_t width = canvas->width;
size_t height = canvas->height;
/* Check if we can optimize this */
DMNSN_ARRAY_FOREACH (dmnsn_canvas_optimizer *, i, canvas->optimizers) {
if (i->optimizer_fn == dmnsn_gl_optimizer_fn) {
glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_SHORT, i->ptr);
return glGetError() == GL_NO_ERROR ? 0 : 1;
}
}
/* We couldn't, so transform the canvas to RGB now */
pixels = dmnsn_malloc(4*width*height*sizeof(GLushort));
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x) {
pixel = pixels + 4*(y*width + x);
color = dmnsn_canvas_get_pixel(canvas, x, y);
color = dmnsn_remove_filter(color);
color = dmnsn_color_to_sRGB(color);
color = dmnsn_color_saturate(color);
pixel[0] = lround(color.R*UINT16_MAX);
pixel[1] = lround(color.G*UINT16_MAX);
pixel[2] = lround(color.B*UINT16_MAX);
pixel[3] = lround(color.trans*UINT16_MAX);
}
}
glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_SHORT, pixels);
dmnsn_free(pixels);
return glGetError() == GL_NO_ERROR ? 0 : 1;
}
/* Read a canvas from a GL framebuffer. Returns NULL on failure. */
dmnsn_canvas *
dmnsn_gl_read_canvas(size_t x0, size_t y0,
size_t width, size_t height)
{
dmnsn_canvas *canvas = dmnsn_new_canvas(width, height);
/* Array of 16-bit ints in RGBA order */
GLushort *pixels = dmnsn_malloc(4*width*height*sizeof(GLushort));
glReadPixels(x0, y0, width, height, GL_RGBA, GL_UNSIGNED_SHORT, pixels);
if (glGetError() != GL_NO_ERROR) {
dmnsn_free(pixels);
dmnsn_delete_canvas(canvas);
return NULL;
}
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x) {
GLushort *pixel = pixels + 4*(y*width + x);
dmnsn_color color = dmnsn_new_color5((double)pixel[0]/UINT16_MAX,
(double)pixel[1]/UINT16_MAX,
(double)pixel[2]/UINT16_MAX,
(double)pixel[3]/UINT16_MAX,
0.0);
color = dmnsn_color_from_sRGB(color);
dmnsn_canvas_set_pixel(canvas, x, y, color);
}
}
dmnsn_free(pixels);
return canvas;
}
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