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Speed up and fix unigi_ext_texture_draw

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This commit is contained in:
Fierelier 2024-09-25 21:12:28 +02:00
parent b1cc74007a
commit d8789b7689
2 changed files with 40 additions and 48 deletions
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82
main.c
View File

@ -1,51 +1,43 @@
#include "unigi.ext/main.h"
void unigi_ext_texture_draw(
unigi_ext_type_texture tex,
unigi_ext_type_texture buffer,
unigi_ext_type_rect texbounds,
unigi_ext_type_rect bufbounds
) {
unigi_ext_type_2d_coord texwidth;
unigi_ext_type_2d_coord texheight;
unigi_ext_type_2d_coord outwidth;
unigi_ext_type_2d_coord outheight;
unigi_ext_type_2d_coord x;
unigi_ext_type_2d_coord y;
unigi_type_resolution_1d_coord texi;
unigi_type_resolution_1d_coord bufi;
unigi_ext_type_2d_coord stepx;
unigi_ext_type_2d_coord stepy;
unigi_ext_type_2d_coord texx;
unigi_ext_type_2d_coord texy;
void unigi_ext_texture_draw(unigi_ext_type_texture *sprite, unigi_ext_type_texture *fb, unigi_ext_type_rect texrect, unigi_ext_type_rect outrect) {
// Precalc the step, as it's always the same even if we clip the rect
unigi_ext_type_2d_coord tex_width, tex_height, out_width, out_height;
unigi_ext_rect_dimensions(texrect,&tex_width,&tex_height);
unigi_ext_rect_dimensions(outrect,&out_width,&out_height);
int32_t stepx = (1 << unigi_ext_texture_fixedpointdepth) * (float)tex_width / out_width;
int32_t stepy = (1 << unigi_ext_texture_fixedpointdepth) * (float)tex_height / out_height;
int32_t texx_init = (1 << unigi_ext_texture_fixedpointdepth) * texrect.x1;
int32_t texy = (1 << unigi_ext_texture_fixedpointdepth) * texrect.y1;
// Clip the rect
if (outrect.x1 < 0) {
texx_init += stepx * -outrect.x1;
outrect.x1 = 0;
}
if (outrect.y1 < 0) {
texy += stepy * -outrect.y1;
outrect.y1 = 0;
}
if (outrect.x2 >= fb->width) {
outrect.x2 = fb->width - 1;
}
if (outrect.y2 >= fb->height) {
outrect.y2 = fb->height - 1;
}
unigi_ext_rect_dimensions(texbounds, &texwidth, &texheight);
unigi_ext_rect_dimensions(bufbounds, &outwidth, &outheight);
// We precalculate the step through the texture to avoid division and
// multiplication per pixel. We also expand the range so we can use
// integers. By using 256, we are essentially adding 8 bits of "decimal
// point". If you need more bits (or less), just change this to some other
// power of 2.
stepx = (1 << unigi_ext_texture_fixedpointdepth) * (float)texwidth / outwidth;
stepy = (1 << unigi_ext_texture_fixedpointdepth) * (float)texheight / outheight;
texx = (1 << unigi_ext_texture_fixedpointdepth) * texbounds.x1;
texy = (1 << unigi_ext_texture_fixedpointdepth) * texbounds.y1;
//log("%f,%f step %f,%f", texx, texy, stepx, stepy);
// Buffer is R G B for each pixel, then across then down. If you want X, Y,
// it's: 3 * (x + y * width)
for(y = bufbounds.y1; y < bufbounds.y2; y++) {
texx = texbounds.x1;
for(x = bufbounds.x1; x < bufbounds.x2; x++) {
// And then with the shift, it is log2(256), or whatever you shifted
// by up there. So 512 would be 9, because 2^9 = 512
texi = (texx >> unigi_ext_texture_fixedpointdepth) + tex.width * (texy >> unigi_ext_texture_fixedpointdepth); // 'texy >> FIXEDPOINTDEPTH' could be calculated per y-iteration
bufi = x + y * buffer.width; // 'y * buffer.width' could be calculated per y-iteration
buffer.pixels[bufi] = tex.pixels[texi];
texx += stepx;
bufi += 1;
}
texy += stepy;
}
for (int y = outrect.y1; y < outrect.y2; y++) {
int32_t texx = texx_init;
int yiter = y * fb->width;
for (int x = outrect.x1; x < outrect.x2; x++) {
uint16_t pix = sprite->pixels[((texy >> unigi_ext_texture_fixedpointdepth) * sprite->width) + (texx >> unigi_ext_texture_fixedpointdepth)];
if (pix & 0xF000) {
fb->pixels[yiter + x] = pix;
}
texx += stepx;
}
texy += stepy;
}
}
unigi_ext_type_texture * unigi_ext_texture_create(unigi_ext_type_2d_coord width, unigi_ext_type_2d_coord height) {

4
main.h
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@ -5,8 +5,8 @@
#include "structs.h"
void unigi_ext_texture_draw(
unigi_ext_type_texture tex,
unigi_ext_type_texture buffer,
unigi_ext_type_texture * tex,
unigi_ext_type_texture * buffer,
unigi_ext_type_rect texbounds,
unigi_ext_type_rect bufbounds
);