i have fragment shader in android app using gles 2.0 works fine on emulator crashes "fatal signal 11 (sigsegv) @ 0x00000004 (code=1)" on nexus 4 when try link shader program.
i started google's tutorial (http://developer.android.com/training/graphics/opengl/draw.html) , took there.
this vertex shader:
uniform mat4 umvpmatrix; varying vec2 vtexcoord; attribute vec4 vposition; void main() { gl_position = umvpmatrix * vposition; vtexcoord = vposition.xy * vec2(0.5) + vec2(0.5); } this fragment shader:
precision mediump float; uniform sampler2d utexture1; uniform sampler2d utexture2; uniform float pointx; uniform float pointy; uniform float opening; uniform float openingbufferzone; uniform vec4 acolor; varying vec2 vtexcoord; float sizex = 2048.0; float sizey = 512.0; void main() { float x = (vtexcoord.x * sizex) - pointx; float y = (vtexcoord.y * sizey) - pointy; float distance = x * x + y * y; if (distance < opening) { gl_fragcolor = texture2d(utexture2, vtexcoord) * acolor; } else { if (distance >= opening && distance < opening + openingbufferzone) { float inner = (distance-opening)/openingbufferzone; vec4 c1 = (vec4(inner,inner,inner,1.0) * texture2d(utexture1, vtexcoord) * acolor); vec4 c2 = (vec4(inner,inner,inner,1.0) * texture2d(utexture2, vtexcoord) * acolor); gl_fragcolor = c1 + c2; } else { gl_fragcolor = texture2d(utexture1, vtexcoord) * acolor; } } } this how load shaders:
int vertexshader = glactivity.loadshader(gles20.gl_vertex_shader, vertexshadercode); int fragmentshader = glactivity.loadshader(gles20.gl_fragment_shader, fragmentshadercode); mprogram = gles20.glcreateprogram(); gles20.glattachshader(mprogram, vertexshader); gles20.glattachshader(mprogram, fragmentshader); gles20.gllinkprogram(mprogram); the error occurs when trying execute last line gles20.gllinkprogram(mprogram);.
for reason these 2 lines in vertex shader seem cause trouble:
vec4 c1 = (vec4(inner,inner,inner,1.0) * texture2d(utexture1, vtexcoord) * acolor); vec4 c2 = (vec4(inner,inner,inner,1.0) * texture2d(utexture2, vtexcoord) * acolor); if change them
vec4 c1 = (vec4(inner,inner,inner,1.0) * texture2d(utexture1, vtexcoord) * acolor); vec4 c2 = (vec4(inner,inner,inner,1.0) * texture2d(utexture1, vtexcoord) * acolor); or
vec4 c1 = (vec4(inner,inner,inner,1.0) * texture2d(utexture2, vtexcoord) * acolor); vec4 c2 = (vec4(inner,inner,inner,1.0) * texture2d(utexture2, vtexcoord) * acolor); and leave else is, program runs fine (though not intended).
seems problem in nexus 4, facing. no solution yet. here links
https://developer.qualcomm.com/forum/qdevnet-forums/mobile-gaming-graphics-optimization-adreno/8791
https://developer.qualcomm.com/forum/qdevnet-forums/mobile-gaming-graphics-optimization-adreno/23990
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