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Fixed arrow rendering shader for Samsung Galaxy S3

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This commit is contained in:
Roman Kuznetsov 2015-09-25 13:14:50 +03:00 • committed by r.kuznetsov
parent a8b45fc4d9
commit cc9aa209a0
1 changed files with 18 additions and 17 deletions
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35
drape/shaders/route_arrow_fragment_shader.fsh
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@ -5,26 +5,27 @@ uniform vec4 u_textureRect;
uniform mat4 u_arrowBorders;
vec2 calculateUv(vec2 len, vec4 arrowBorder)
{
vec2 uv = vec2(0, 0);
if (len.x >= arrowBorder.x && len.x <= arrowBorder.z)
{
float coef = clamp((len.x - arrowBorder.x) / (arrowBorder.z - arrowBorder.x), 0.0, 1.0);
float u = mix(arrowBorder.y, arrowBorder.w, coef);
float v = 0.5 * len.y + 0.5;
uv = vec2(mix(u_textureRect.x, u_textureRect.z, u), mix(u_textureRect.y, u_textureRect.w, v));
}
return uv;
}
void main(void)
{
bool needDiscard = true;
vec2 uv = vec2(0, 0);
for (int i = 0; i < 4; i++)
{
vec4 arrowBorder = u_arrowBorders[i];
if (v_length.x >= arrowBorder.x && v_length.x <= arrowBorder.z)
{
needDiscard = false;
float coef = clamp((v_length.x - arrowBorder.x) / (arrowBorder.z - arrowBorder.x), 0.0, 1.0);
float u = mix(arrowBorder.y, arrowBorder.w, coef);
float v = 0.5 * v_length.y + 0.5;
uv = vec2(mix(u_textureRect.x, u_textureRect.z, u), mix(u_textureRect.y, u_textureRect.w, v));
}
}
vec4 arrowBorder = u_arrowBorders[0];
vec2 uv = calculateUv(v_length, u_arrowBorders[0]) +
calculateUv(v_length, u_arrowBorders[1]) +
calculateUv(v_length, u_arrowBorders[2]) +
calculateUv(v_length, u_arrowBorders[3]);
vec4 color = texture2D(u_colorTex, uv);
if (needDiscard)
color.a = 0.0;
gl_FragColor = color;
}