Hi! I just managed to run shaders in raspberry 4 by changing the version to gles 2 in the main.cpp. Now I am trying to run a depth of field effect in the Rpi with the ofxDOF addon. Anybody knows how to do it, as the addon will not run in raspberry.
I got this error
/home/pi/openFrameworks/addons/ofxDOF/src/ofxDOF.cpp:25:61: error: ‘GL_TEXTURE_RECTANGLE_ARB’ was not declared in this scope
dofBuffersSettings.textureTarget = ofGetUsingArbTex() ? GL_TEXTURE_RECTANGLE_ARB : GL_TEXTURE_2D;
^~~~~~~~~~~~~~~~~~~~~~~~
/home/pi/openFrameworks/addons/ofxDOF/src/ofxDOF.cpp:25:61: note: suggested alternative: ‘GL_TEXTURE_EXTERNAL_OES’
dofBuffersSettings.textureTarget = ofGetUsingArbTex() ? GL_TEXTURE_RECTANGLE_ARB : GL_TEXTURE_2D;
^~~~~~~~~~~~~~~~~~~~~~~~
GL_TEXTURE_EXTERNAL_OES
So I went to the ofxDOF.cpp and changed GL_TEXTURE_RECTANGLE_ARB by GL_TEXTURE_EXTERNAL_OES, and it compiled, but it reports several errors on the shader:
[ error ] ofShader: GL_VERTEX_SHADER shader reports:
0:1(10): error: GLSL 1.50 is not supported. Supported versions are: 1.00 ES, 3.00 ES, and 3.10 ES
[ error ] ofShader: GL_VERTEX_SHADER, offending line 10 :
8
9 // App uniforms and attributes
10 out vec4 vColor;
11 out vec2 vTexCoord;
12
[ error ] ofShader: setupShaderFromSource(): GL_FRAGMENT_SHADER shader failed to compile
[ error ] ofShader: GL_FRAGMENT_SHADER shader reports:
0:1(10): error: GLSL 1.50 is not supported. Supported versions are: 1.00 ES, 3.00 ES, and 3.10 ES
[ error ] ofShader: GL_FRAGMENT_SHADER, offending line 10 :
8 uniform sampler2DRect range;
9 uniform vec2 sampleOffset;
10 uniform float focalDistance;
11 uniform float focalRange;
12
[ error ] ofShader: checkProgramLinkStatus(): program failed to link
[ error ] ofShader: ofShader: program reports:
error: linking with uncompiled/unspecialized shadererror: linking with uncompiled/unspecialized shader
[ error ] ofShader: setupShaderFromSource(): GL_VERTEX_SHADER shader failed to compile
[ error ] ofShader: GL_VERTEX_SHADER shader reports:
0:1(10): error: GLSL 1.50 is not supported. Supported versions are: 1.00 ES, 3.00 ES, and 3.10 ES
[ error ] ofShader: GL_VERTEX_SHADER, offending line 10 :
8 in vec2 texcoord;
9
10 // App uniforms and attributes
11 out vec4 vColor;
12 out vec2 vTexCoord;
[ error ] ofShader: setupShaderFromSource(): GL_FRAGMENT_SHADER shader failed to compile
[ error ] ofShader: GL_FRAGMENT_SHADER shader reports:
0:1(10): error: GLSL 1.50 is not supported. Supported versions are: 1.00 ES, 3.00 ES, and 3.10 ES
[ error ] ofShader: GL_FRAGMENT_SHADER, offending line 10 :
8 uniform float focalRange;
9
10 in vec4 vColor;
11 in vec2 vTexCoord;
12
[ error ] ofShader: checkProgramLinkStatus(): program failed to link
[ error ] ofShader: ofShader: program reports:
error: linking with uncompiled/unspecialized shadererror: linking with uncompiled/unspecialized shader
[ error ] ofFbo: getDepthTexture(): frame buffer object 1 not allocated with depthStencilAsTexture
If anybody knows what should I do to make it work, would be very cool. 
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