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graphics: Bug fix: rounding texels is required even on the nearest filter

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Fixes #558
This commit is contained in:
Hajime Hoshi 2018-03-19 10:37:18 +09:00
parent d421648e57
commit 927a4388b5
1 changed files with 4 additions and 2 deletions
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6
internal/graphics/shader.go
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@ -100,6 +100,10 @@ highp vec2 roundTexel(highp vec2 p) {
void main(void) { void main(void) {
highp vec2 pos = varying_tex_coord; highp vec2 pos = varying_tex_coord;
// pos might include a very slight error.
// roundTexel adjusts pos by rounding it (#315, #558).
pos = roundTexel(pos);
#if defined(FILTER_NEAREST) #if defined(FILTER_NEAREST)
vec4 color = texture2D(texture, pos); vec4 color = texture2D(texture, pos);
if (pos.x < varying_tex_coord_min.x || if (pos.x < varying_tex_coord_min.x ||
@ -111,7 +115,6 @@ void main(void) {
#endif #endif
#if defined(FILTER_LINEAR) #if defined(FILTER_LINEAR)
pos = roundTexel(pos);
highp vec2 texel_size = 1.0 / source_size; highp vec2 texel_size = 1.0 / source_size;
highp vec2 p0 = pos - texel_size / 2.0; highp vec2 p0 = pos - texel_size / 2.0;
@ -142,7 +145,6 @@ void main(void) {
#endif #endif
#if defined(FILTER_SCREEN) #if defined(FILTER_SCREEN)
pos = roundTexel(pos);
highp vec2 texel_size = 1.0 / source_size; highp vec2 texel_size = 1.0 / source_size;
pos -= texel_size / 2.0 / scale; pos -= texel_size / 2.0 / scale;