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/*************************************************************************
* Copyright (C) 2009-2014 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 "internal/rgba.h"
#include "dimension/canvas.h"
#include <GL/gl.h>
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
// Optimize canvas for GL drawing
int
dmnsn_gl_optimize_canvas(dmnsn_pool *pool, dmnsn_canvas *canvas)
{
dmnsn_rgba8_optimize_canvas(pool, canvas);
return 0;
}
// Write canvas to GL framebuffer. Returns 0 on success, nonzero on failure
int
dmnsn_gl_write_canvas(const dmnsn_canvas *canvas)
{
size_t width = canvas->width;
size_t height = canvas->height;
// Check if we can optimize this
dmnsn_rgba8_optimizer *rgba8 = (dmnsn_rgba8_optimizer *)dmnsn_canvas_find_optimizer(canvas, dmnsn_rgba8_optimizer_fn);
if (rgba8) {
glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_BYTE, rgba8->data);
return glGetError() == GL_NO_ERROR ? 0 : 1;
}
// We couldn't, so transform the canvas to RGB now
GLubyte *pixels = dmnsn_malloc(4*width*height*sizeof(GLubyte));
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x) {
GLubyte *pixel = pixels + 4*(y*width + x);
dmnsn_tcolor tcolor = dmnsn_canvas_get_pixel(canvas, x, y);
tcolor = dmnsn_tcolor_remove_filter(tcolor);
tcolor.c = dmnsn_color_to_sRGB(tcolor.c);
tcolor = dmnsn_tcolor_clamp(tcolor);
pixel[0] = lround(tcolor.c.R*UINT8_MAX);
pixel[1] = lround(tcolor.c.G*UINT8_MAX);
pixel[2] = lround(tcolor.c.B*UINT8_MAX);
pixel[3] = lround(tcolor.T*UINT8_MAX);
}
}
glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
dmnsn_free(pixels);
return glGetError() == GL_NO_ERROR ? 0 : 1;
}
// Read a canvas from a GL framebuffer. Returns NULL on failure.
int
dmnsn_gl_read_canvas(dmnsn_canvas *canvas, size_t x0, size_t y0)
{
size_t width = canvas->width;
size_t height = canvas->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);
return -1;
}
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x) {
GLushort *pixel = pixels + 4*(y*width + x);
dmnsn_tcolor tcolor = dmnsn_new_tcolor5(
(double)pixel[0]/UINT16_MAX,
(double)pixel[1]/UINT16_MAX,
(double)pixel[2]/UINT16_MAX,
(double)pixel[3]/UINT16_MAX,
0.0
);
tcolor.c = dmnsn_color_from_sRGB(tcolor.c);
dmnsn_canvas_set_pixel(canvas, x, y, tcolor);
}
}
dmnsn_free(pixels);
return 0;
}
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