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#include "common/msg.h"
#include "utils.h"
// Standard parallel 2D projection, except y1 < y0 means that the coordinate
// system is flipped, not the projection.
void gl_transform_ortho(struct gl_transform *t, float x0, float x1,
float y0, float y1)
{
if (y1 < y0) {
float tmp = y0;
y0 = tmp - y1;
y1 = tmp;
}
t->m[0][0] = 2.0f / (x1 - x0);
t->m[0][1] = 0.0f;
t->m[1][0] = 0.0f;
t->m[1][1] = 2.0f / (y1 - y0);
t->t[0] = -(x1 + x0) / (x1 - x0);
t->t[1] = -(y1 + y0) / (y1 - y0);
}
// Apply the effects of one transformation to another, transforming it in the
// process. In other words: post-composes t onto x
void gl_transform_trans(struct gl_transform t, struct gl_transform *x)
{
struct gl_transform xt = *x;
x->m[0][0] = t.m[0][0] * xt.m[0][0] + t.m[0][1] * xt.m[1][0];
x->m[1][0] = t.m[1][0] * xt.m[0][0] + t.m[1][1] * xt.m[1][0];
x->m[0][1] = t.m[0][0] * xt.m[0][1] + t.m[0][1] * xt.m[1][1];
x->m[1][1] = t.m[1][0] * xt.m[0][1] + t.m[1][1] * xt.m[1][1];
gl_transform_vec(t, &x->t[0], &x->t[1]);
}
// Create a texture and a FBO using the texture as color attachments.
// fmt: texture internal format
// Returns success.
bool fbotex_init(struct fbotex *fbo, struct ra *ra, struct mp_log *log,
int w, int h, const struct ra_format *fmt)
{
assert(!fbo->tex);
return fbotex_change(fbo, ra, log, w, h, fmt, 0);
}
// Like fbotex_init(), except it can be called on an already initialized FBO;
// and if the parameters are the same as the previous call, do not touch it.
// flags can be 0, or a combination of FBOTEX_FUZZY_W and FBOTEX_FUZZY_H.
// Enabling FUZZY for W or H means the w or h does not need to be exact.
bool fbotex_change(struct fbotex *fbo, struct ra *ra, struct mp_log *log,
int w, int h, const struct ra_format *fmt, int flags)
{
if (fbo->tex) {
int cw = w, ch = h;
int rw = fbo->tex->params.w, rh = fbo->tex->params.h;
if ((flags & FBOTEX_FUZZY_W) && cw < rw)
cw = rw;
if ((flags & FBOTEX_FUZZY_H) && ch < rh)
ch = rh;
if (rw == cw && rh == ch && fbo->tex->params.format == fmt) {
fbo->lw = w;
fbo->lh = h;
return true;
}
}
int lw = w, lh = h;
if (flags & FBOTEX_FUZZY_W)
w = MP_ALIGN_UP(w, 256);
if (flags & FBOTEX_FUZZY_H)
h = MP_ALIGN_UP(h, 256);
mp_verbose(log, "Create FBO: %dx%d (%dx%d)\n", lw, lh, w, h);
if (!fmt || !fmt->renderable || !fmt->linear_filter) {
mp_err(log, "Format %s not supported.\n", fmt ? fmt->name : "(unset)");
return false;
}
fbotex_uninit(fbo);
*fbo = (struct fbotex) {
.ra = ra,
.rw = w,
.rh = h,
.lw = lw,
.lh = lh,
};
struct ra_tex_params params = {
.dimensions = 2,
.w = w,
.h = h,
.d = 1,
.format = fmt,
.src_linear = true,
.render_src = true,
.render_dst = true,
};
fbo->tex = ra_tex_create(fbo->ra, ¶ms);
if (!fbo->tex) {
mp_err(log, "Error: framebuffer could not be created.\n");
fbotex_uninit(fbo);
return false;
}
return true;
}
void fbotex_uninit(struct fbotex *fbo)
{
if (fbo->ra) {
ra_tex_free(fbo->ra, &fbo->tex);
*fbo = (struct fbotex) {0};
}
}
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