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graphics: Bug fix: pixel coord is upper-left by default

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Hajime Hoshi 2018-02-24 01:16:32 +09:00
parent c76ff5ceb2
commit e5a2cf29c0
1 changed files with 2 additions and 3 deletions
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5
internal/graphics/shader.go
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@ -104,6 +104,7 @@ void main(void) {
// adjustment, texels can be exactly as same values as the (lower and left) edges'
// positions and it could happen that outside of the source is rendered. (#491)
// 1.0 / 4096.0 is an arbitrary number that doesn't cause problems on MacBook Pro.
// TODO: Adding is better?
pos.x = min(varying_tex_coord_max.x - 1.0 / 4096.0, pos.x);
pos.y = min(varying_tex_coord_max.y - 1.0 / 4096.0, pos.y);
@ -120,7 +121,6 @@ void main(void) {
#if defined(FILTER_LINEAR)
pos = roundTexel(pos);
highp vec2 texel_size = 1.0 / source_size;
pos -= texel_size * 0.5;
highp vec2 p0 = pos;
highp vec2 p1 = pos + texel_size;
@ -152,7 +152,6 @@ void main(void) {
#if defined(FILTER_SCREEN)
pos = roundTexel(pos);
highp vec2 texel_size = 1.0 / source_size;
pos -= texel_size * 0.5 / scale;
highp vec2 p0 = pos;
highp vec2 p1 = pos + texel_size / scale;
@ -162,7 +161,7 @@ void main(void) {
vec4 c3 = texture2D(texture, p1);
// Texels must be in the source rect, so it is not necessary to check that like linear filter.
vec2 rate = clamp((fract(pos * source_size) - 0.5) * scale + 0.5, 0.0, 1.0);
vec2 rate = clamp((fract(pos * source_size) - vec2(0.5, 0.5)) * scale + vec2(0.5, 0.5), vec2(0.0, 0.), vec2(1.0, 1.0));
vec4 color = mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
#endif