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graphics: Optimize GLSL

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Hajime Hoshi 2017-12-18 03:10:04 +09:00
parent 7b76b7822f
commit f072e8f1c5
1 changed files with 12 additions and 15 deletions
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27
internal/graphics/shader.go
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@ -96,34 +96,31 @@ void main(void) {
highp vec2 texel_size = 1.0 / source_size;
pos -= texel_size * 0.5;
highp float x0 = pos.x;
highp float y0 = pos.y;
highp float x1 = pos.x + texel_size.x;
highp float y1 = pos.y + texel_size.y;
vec4 c0 = texture2D(texture, vec2(x0, y0));
vec4 c1 = texture2D(texture, vec2(x1, y0));
vec4 c2 = texture2D(texture, vec2(x0, y1));
vec4 c3 = texture2D(texture, vec2(x1, y1));
if (x0 < varying_tex_coord_min.x) {
highp vec2 p0 = pos;
highp vec2 p1 = pos + texel_size;
vec4 c0 = texture2D(texture, p0);
vec4 c1 = texture2D(texture, vec2(p1.x, p0.y));
vec4 c2 = texture2D(texture, vec2(p0.x, p1.y));
vec4 c3 = texture2D(texture, p1);
if (p0.x < varying_tex_coord_min.x) {
c0 = vec4(0, 0, 0, 0);
c2 = vec4(0, 0, 0, 0);
}
if (y0 < varying_tex_coord_min.y) {
if (p0.y < varying_tex_coord_min.y) {
c0 = vec4(0, 0, 0, 0);
c1 = vec4(0, 0, 0, 0);
}
if (varying_tex_coord_max.x <= x1) {
if (varying_tex_coord_max.x <= p1.x) {
c1 = vec4(0, 0, 0, 0);
c3 = vec4(0, 0, 0, 0);
}
if (varying_tex_coord_max.y <= y1) {
if (varying_tex_coord_max.y <= p1.y) {
c2 = vec4(0, 0, 0, 0);
c3 = vec4(0, 0, 0, 0);
}
float rateX = fract(pos.x * source_size.x);
float rateY = fract(pos.y * source_size.y);
color = mix(mix(c0, c1, rateX), mix(c2, c3, rateX), rateY);
vec2 rate = fract(pos * source_size);
color = mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
} else {
// Error
color = vec4(1, 0, 0, 1);