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/* Goxel 3D voxels editor
*
* copyright (c) 2015 Guillaume Chereau <guillaume@noctua-software.com>
*
* Goxel is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
* Goxel 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 General Public License for more
* details.
* You should have received a copy of the GNU General Public License along with
* goxel. If not, see <http://www.gnu.org/licenses/>.
*/
#include "goxel.h"
#include <stdarg.h>
// Return the next power of 2 larger or equal to x.
static int next_pow2(int x)
{
x--;
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
x++;
return x;
}
static bool is_pow2(int x) { return x == next_pow2(x); }
static void texture_create_empty(texture_t *tex)
{
assert(tex->flags & TF_HAS_TEX);
GL(glGenTextures(1, &tex->tex));
GL(glActiveTexture(GL_TEXTURE0));
GL(glBindTexture(GL_TEXTURE_2D, tex->tex));
GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
GL_LINEAR));
GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR));
GL(glTexImage2D(GL_TEXTURE_2D, 0, tex->format, tex->tex_w, tex->tex_h,
0, tex->format, GL_UNSIGNED_BYTE, NULL));
}
static void blit(const uint8_t *src, int src_w, int src_h, int bpp,
uint8_t *dst, int dst_w, int dst_h)
{
int i, j;
for (i = 0; i < src_h; i++) for (j = 0; j < src_w; j++) {
memcpy(&dst[(i * dst_w + j) * bpp], &src[(i * src_w + j) * bpp], bpp);
}
}
static void texture_set_data(texture_t *tex,
const uint8_t *data, int w, int h, int bpp)
{
uint8_t *buff0 = NULL;
int data_type = GL_UNSIGNED_BYTE;
if (!is_pow2(w) || !is_pow2(h)) {
buff0 = calloc(bpp, tex->tex_w * tex->tex_h);
blit(data, w, h, bpp, buff0, tex->tex_w, tex->tex_h);
data = buff0;
}
GL(glGenTextures(1, &tex->tex));
GL(glActiveTexture(GL_TEXTURE0));
GL(glBindTexture(GL_TEXTURE_2D, tex->tex));
if (!(tex->flags & TF_NEAREST)) {
GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
(tex->flags & TF_MIPMAP)? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR));
} else {
GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
}
GL(glTexImage2D(GL_TEXTURE_2D, 0, tex->format, tex->tex_w, tex->tex_h,
0, tex->format, data_type, data));
free(buff0);
if (tex->flags & TF_MIPMAP)
GL(glGenerateMipmap(GL_TEXTURE_2D));
}
texture_t *texture_new_image(const char *path, int flags)
{
texture_t *tex;
uint8_t *img;
int w, h, bpp = 0;
img = img_read(path, &w, &h, &bpp);
if (!img) {
LOG_W("Cannot open image '%s'", path);
return NULL;
}
tex = calloc(1, sizeof(*tex));
tex->path = strdup(path);
tex->tex_w = next_pow2(w);
tex->tex_h = next_pow2(h);
tex->w = w;
tex->h = h;
tex->flags = TF_HAS_TEX | flags;
tex->format = (int[]){0, 0, GL_LUMINANCE_ALPHA, GL_RGB, GL_RGBA}[bpp];
texture_create_empty(tex);
texture_set_data(tex, img, w, h, bpp);
free(img);
tex->ref = 1;
return tex;
}
texture_t *texture_new_from_buf(const uint8_t *data,
int w, int h, int bpp, int flags)
{
texture_t *tex;
tex = calloc(1, sizeof(*tex));
tex->tex_w = next_pow2(w);
tex->tex_h = next_pow2(h);
tex->w = w;
tex->h = h;
tex->flags = TF_HAS_TEX | flags;
tex->format = (int[]){0, 0, GL_LUMINANCE_ALPHA, GL_RGB, GL_RGBA}[bpp];
texture_create_empty(tex);
texture_set_data(tex, data, w, h, bpp);
tex->ref = 1;
return tex;
}
texture_t *texture_new_surface(int w, int h, int flags)
{
texture_t *tex;
tex = calloc(1, sizeof(*tex));
tex->tex_w = next_pow2(w);
tex->tex_h = next_pow2(h);
tex->w = w;
tex->h = h;
tex->flags = flags | TF_HAS_TEX;
tex->format = (flags & TF_RGB) ? GL_RGB : GL_RGBA;
texture_create_empty(tex);
tex->ref = 1;
return tex;
}
texture_t *texture_new_buffer(int w, int h, int flags)
{
texture_t *tex;
tex = calloc(1, sizeof(*tex));
tex->format = (flags & TF_RGB) ? GL_RGB : GL_RGBA;
tex->tex_w = next_pow2(w);
tex->tex_h = next_pow2(h);
tex->w = w;
tex->h = h;
tex->flags = flags | TF_HAS_FB | TF_HAS_TEX;
gl_gen_fbo(tex->tex_w, tex->tex_h, tex->format, 1,
&tex->framebuffer, &tex->tex);
tex->ref = 1;
return tex;
}
void texture_delete(texture_t *tex)
{
if (!tex) return;
tex->ref--;
if (tex->ref > 0) return;
free(tex->path);
if (tex->framebuffer) {
GL(glBindFramebuffer(GL_FRAMEBUFFER, tex->framebuffer));
if (tex->depth)
GL(glDeleteRenderbuffers(1, &tex->depth));
if (tex->stencil)
GL(glDeleteRenderbuffers(1, &tex->stencil));
GL(glDeleteFramebuffers(1, &tex->framebuffer));
}
if (tex->tex)
GL(glDeleteTextures(1, &tex->tex));
free(tex);
}
texture_t *texture_copy(texture_t *tex)
{
// XXX: since texture are immutable, we just increase the ref counter.
if (tex) tex->ref++;
return tex;
}
void texture_get_data(const texture_t *tex, int w, int h, int bpp,
uint8_t *buf)
{
uint8_t *tmp;
size_t i, j;
tmp = calloc(w * h, 4);
GL(glBindFramebuffer(GL_FRAMEBUFFER, tex->framebuffer));
GL(glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, tmp));
// Flip output y and remove alpha if needed.
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
memcpy(&buf[(i * w + j) * bpp],
&tmp[((h - i - 1) * w + j) * 4],
bpp);
}
}
free(tmp);
}
void texture_save_to_file(const texture_t *tex, const char *path)
{
uint8_t *data;
int w, h;
LOG_I("save texture to %s", path);
w = tex->tex_w;
h = tex->tex_h;
data = calloc(w * h, 4);
texture_get_data(tex, w, h, 4, data);
img_write(data, w, h, 4, path);
free(data);
}
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