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我想做一個android使用opengl 2.0的魚眼效果，我可以做到不使用opengl，但這不是我想要的，因爲這是效率低下，不支持視頻紋理。我還使用Android Media Effects API測試魚眼效果，但效果看起來不太好。魚眼效果使用opengles
我也搜索fishshader如下：
private static final String FISHEYE_FRAGMENT_SHADER =
"precision mediump float;\n" +
"uniform sampler2D u_Texture;\n" +
"uniform vec2 vScale;\n" +
"const float alpha = float(4.0 * 2.0 + 0.75);\n" +
"varying vec2 v_TexCoordinate;\n" +
"void main() {\n" +
" float bound2 = 0.25 * (vScale.x * vScale.x + vScale.y * vScale.y);\n" +
" float bound = sqrt(bound2);\n" +
" float radius = 1.15 * bound;\n" +
" float radius2 = radius * radius;\n" +
" float max_radian = 0.5 * 3.14159265 - atan(alpha/bound * sqrt(radius2 - bound2));\n" +
" float factor = bound/max_radian;\n" +
" float m_pi_2 = 1.570963;\n" +
" vec2 coord = v_TexCoordinate - vec2(0.5, 0.5);\n" +
" float dist = length(coord * vScale);\n" +
" float radian = m_pi_2 - atan(alpha * sqrt(radius2 - dist * dist), dist);\n" +
" float scalar = radian * factor/dist;\n" +
" vec2 new_coord = coord * scalar + vec2(0.5, 0.5);\n" +
" gl_FragColor = texture2D(u_Texture, new_coord);\n" +
"}\n";
這是我想要的，但我知道DONOT如何使用它。可有人給我一些線索。