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graphics: Optimize fragment shader

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Hajime Hoshi 2017-12-16 18:35:45 +09:00
parent 94d54b7d2c
commit 44dc9f6220
1 changed files with 6 additions and 11 deletions
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17
internal/graphics/shader.go
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@ -79,23 +79,18 @@ highp vec2 roundTexel(highp vec2 p) {
return p;
}
vec4 getColorAt(highp vec2 pos) {
if (pos.x < varying_tex_coord_min.x ||
pos.y < varying_tex_coord_min.y ||
varying_tex_coord_max.x <= pos.x ||
varying_tex_coord_max.y <= pos.y) {
return vec4(0, 0, 0, 0);
}
return texture2D(texture, pos);
}
void main(void) {
vec4 color = vec4(0, 0, 0, 0);
highp vec2 pos = roundTexel(varying_tex_coord);
if (filter_type == 1) {
// Nearest neighbor
color = getColorAt(pos);
if (varying_tex_coord_min.x <= pos.x &&
varying_tex_coord_min.y <= pos.y &&
pos.x < varying_tex_coord_max.x &&
pos.y < varying_tex_coord_max.y) {
color = texture2D(texture, pos);
}
} else if (filter_type == 2) {
// Bi-linear
highp vec2 texel_size = 1.0 / source_size;