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Integrate sokol_letterbox.h #46

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Merged
floooh merged 2 commits into from
Apr 22, 2026
Merged

Integrate sokol_letterbox.h #46

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447a73c
integrate sokol_letterbox.h
floooh Apr 22, 2026
d47698c
slbx_letterbox_viewport => slbx_letterbox
floooh Apr 22, 2026
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39 changes: 14 additions & 25 deletions examples/common/gfx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#include "sokol_audio.h"
#include "sokol_log.h"
#include "sokol_imgui.h"
#include "sokol_letterbox.h"
#include "sokol_glue.h"
#include "chips/chips_common.h"
#include "gfx.h"
Expand Down Expand Up @@ -422,31 +423,19 @@ void gfx_init(const gfx_desc_t* desc) {
top, to make room at the bottom for mobile virtual keyboard
*/
static void apply_viewport(chips_dim_t canvas, chips_rect_t view, chips_dim_t pixel_aspect, gfx_border_t border) {
float cw = (float) (canvas.width - border.left - border.right);
if (cw < 1.0f) {
cw = 1.0f;
}
float ch = (float) (canvas.height - border.top - border.bottom);
if (ch < 1.0f) {
ch = 1.0f;
}
const float canvas_aspect = cw / ch;
const chips_dim_t aspect = pixel_aspect;
const float emu_aspect = (float)(view.width * aspect.width) / (float)(view.height * aspect.height);
float vp_x, vp_y, vp_w, vp_h;
if (emu_aspect < canvas_aspect) {
vp_y = (float)border.top;
vp_h = ch;
vp_w = (ch * emu_aspect);
vp_x = border.left + (cw - vp_w) * 0.5f;
}
else {
vp_x = (float)border.left;
vp_w = cw;
vp_h = (cw / emu_aspect);
vp_y = border.top + (ch - vp_h) * 0.5f;
}
sg_apply_viewportf(vp_x, vp_y, vp_w, vp_h, true);
float emu_aspect = (float)(view.width * pixel_aspect.width) / (float)(view.height * pixel_aspect.height);
const int cw = canvas.width;
const int ch = canvas.height;
const slbx_viewport vp = slbx_letterbox(cw, ch, &(slbx_letterbox_desc){
.content_aspect_ratio = emu_aspect,
.border = {
.left = border.left,
.right = border.right,
.top = border.top,
.bottom = border.bottom,
}
});
sg_apply_viewport(vp.x, vp.y, vp.width, vp.height, true);
}

void gfx_draw(chips_display_info_t display_info) {
Expand Down
1 change: 1 addition & 0 deletions examples/common/sokol.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,4 +10,5 @@
#include "sokol_fetch.h"
#include "sokol_debugtext.h"
#include "sokol_log.h"
#include "sokol_letterbox.h"
#include "sokol_glue.h"
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