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GLES3 Fixes for ninepatch margins when patch size is smaller than the patch texture resolution

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Scaled ninepatch margins in screen space to be relative of the ninepatch size when the patch size is smaller than the patch texture resolution.
This commit is contained in:
Valentin Zagura 2019-10-07 13:19:27 +01:00
parent 6ee84f53a9
commit 100d05cbec
1 changed files with 15 additions and 11 deletions
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26
drivers/gles3/shaders/canvas.glsl
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@ -379,14 +379,16 @@ uniform bool np_draw_center;
// left top right bottom in pixel coordinates
uniform vec4 np_margins;
float map_ninepatch_axis(float pixel, float draw_size, float tex_pixel_size, float margin_begin, float margin_end, int np_repeat, inout int draw_center) {
float map_ninepatch_axis(float pixel, float draw_size, float tex_pixel_size, float margin_begin, float margin_end, float s_ratio, int np_repeat, inout int draw_center) {
float tex_size = 1.0 / tex_pixel_size;
if (pixel < margin_begin) {
return pixel * tex_pixel_size;
} else if (pixel >= draw_size - margin_end) {
return (tex_size - (draw_size - pixel)) * tex_pixel_size;
float screen_margin_begin = margin_begin / s_ratio;
float screen_margin_end = margin_end / s_ratio;
if (pixel < screen_margin_begin) {
return pixel * s_ratio * tex_pixel_size;
} else if (pixel >= draw_size - screen_margin_end) {
return (tex_size - (draw_size - pixel) * s_ratio) * tex_pixel_size;
} else {
if (!np_draw_center) {
draw_center--;
@ -394,22 +396,22 @@ float map_ninepatch_axis(float pixel, float draw_size, float tex_pixel_size, flo
if (np_repeat == 0) { //stretch
//convert to ratio
float ratio = (pixel - margin_begin) / (draw_size - margin_begin - margin_end);
float ratio = (pixel - screen_margin_begin) / (draw_size - screen_margin_begin - screen_margin_end);
//scale to source texture
return (margin_begin + ratio * (tex_size - margin_begin - margin_end)) * tex_pixel_size;
} else if (np_repeat == 1) { //tile
//convert to ratio
float ofs = mod((pixel - margin_begin), tex_size - margin_begin - margin_end);
float ofs = mod((pixel - screen_margin_begin), tex_size - margin_begin - margin_end);
//scale to source texture
return (margin_begin + ofs) * tex_pixel_size;
} else if (np_repeat == 2) { //tile fit
//convert to ratio
float src_area = draw_size - margin_begin - margin_end;
float src_area = draw_size - screen_margin_begin - screen_margin_end;
float dst_area = tex_size - margin_begin - margin_end;
float scale = max(1.0, floor(src_area / max(dst_area, 0.0000001) + 0.5));
//convert to ratio
float ratio = (pixel - margin_begin) / src_area;
float ratio = (pixel - screen_margin_begin) / src_area;
ratio = mod(ratio * scale, 1.0);
return (margin_begin + ratio * dst_area) * tex_pixel_size;
}
@ -431,9 +433,11 @@ void main() {
#ifdef USE_NINEPATCH
int draw_center = 2;
float s_ratio = max((1.0 / color_texpixel_size.x) / abs(dst_rect.z), (1.0 / color_texpixel_size.y) / abs(dst_rect.w));
s_ratio = max(1.0, s_ratio);
uv = vec2(
map_ninepatch_axis(pixel_size_interp.x, abs(dst_rect.z), color_texpixel_size.x, np_margins.x, np_margins.z, np_repeat_h, draw_center),
map_ninepatch_axis(pixel_size_interp.y, abs(dst_rect.w), color_texpixel_size.y, np_margins.y, np_margins.w, np_repeat_v, draw_center));
map_ninepatch_axis(pixel_size_interp.x, abs(dst_rect.z), color_texpixel_size.x, np_margins.x, np_margins.z, s_ratio, np_repeat_h, draw_center),
map_ninepatch_axis(pixel_size_interp.y, abs(dst_rect.w), color_texpixel_size.y, np_margins.y, np_margins.w, s_ratio, np_repeat_v, draw_center));
if (draw_center == 0) {
color.a = 0.0;