mirror of https://github.com/axmolengine/axmol.git
35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
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" \n\
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#ifdef GL_ES \n\
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precision lowp float; \n\
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#endif \n\
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\n\
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varying vec4 v_fragmentColor; \n\
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varying vec2 v_texCoord; \n\
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uniform sampler2D CC_Texture0; \n\
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uniform vec3 v_effectColor; \n\
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uniform vec2 v_shadowOffset; \n\
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\n\
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void main() \n\
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{ \n\
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float dist = texture2D(CC_Texture0, v_texCoord).a; \n\
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//todo:support for assign offset,but the shadow is limited by renderable area\n\ \n\
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vec2 offset = vec2(-0.0015,-0.0015); \n\
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float dist2 = texture2D(CC_Texture0, v_texCoord+offset).a; \n\
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//todo:Implementation 'fwidth' for glsl 1.0 \n\
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//float width = fwidth(dist); \n\
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//assign width for constant will lead to a little bit fuzzy,it's temporary measure.\n\
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float width = 0.04; \n\
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// If v is 1 then it's inside the Glyph; if it's 0 then it's outside \n\
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float v = smoothstep(0.5-width, 0.5+width, dist); \n\
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// If s is 1 then it's inside the shadow; if it's 0 then it's outside \n\
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float s = smoothstep(0.5-width, 0.5+width, dist2); \n\
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if(v == 1.0) gl_FragColor = vec4(v_fragmentColor.rgb,1.0); \n\
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else if(v == 0.0) gl_FragColor = vec4(v_effectColor,s); \n\
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else \n\
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{ \n\
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vec3 color = v_fragmentColor.rgb*v + v_effectColor*s*(1.0-v); \n\
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gl_FragColor = vec4(color,max(s,v)); \n\
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} \n\
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} \n\
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";
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