[osg-users] osgText and OpenGL ES 3

[Sebastian Messerschmidt]

Hi Benjamin,
Can you simply set the color to red in the fragment shader to see, if it 
is indeed applied?

Cheers
Sebastian
> Thanks for your answer Sebastian.
>
> I am using the gl3TextVertexShader and gl3TextFragmentShader shaders from the example, juste modifying the version to be GLES 3 compatible: #version 300 es
>
> Here is the code:
>
> Code:
>
> static const char *gl3TextVertexShader = {
>      "#version 300 es\n"
>      "in vec4 osg_Vertex;\n"
>      "in vec4 osg_Color;\n"
>      "in vec4 osg_MultiTexCoord0;\n"
>      "uniform mat4 osg_ModelViewProjectionMatrix;\n"
>      "out vec2 texCoord;\n"
>      "out vec4 vertexColor;\n"
>      "void main(void)\n"
>      "{\n"
>      "    gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex;\n"
>      "    texCoord = osg_MultiTexCoord0.xy;\n"
>      "    vertexColor = osg_Color; \n"
>      "}\n"
> };
>
> static const char *gl3TextFragmentShader = {
>      "#version 300 es\n"
>      "uniform sampler2D GlyphTexture;\n"
>      "in vec2 texCoord;\n"
>      "in vec4 vertexColor;\n"
>      "out vec4 color;\n"
>      "void main(void)\n"
>      "{\n"
>      "    color = vertexColor * texture(GlyphTexture, texCoord).rrrr;\n"
>      "}\n"
> };
>
>
>
>
> Following the example and your recommendation, I specified the uniform (not present in the original example):
>
> Code:
>
> osg::Group* rootNode = new osg::Group;
>
>      osgText::Font* font = osgText::readFontFile("fonts/ArialMT.ttf");
>
>      //osg::setNotifyLevel(osg::INFO);
>
>      osg::Geode* geode  = new osg::Geode;
>      rootNode->addChild(geode);
>
>      bool useVBOs = true;
>      osg::Program* program = new osg::Program;
>      program->addShader(new osg::Shader(osg::Shader::VERTEX, gl3TextVertexShader));
>      program->addShader(new osg::Shader(osg::Shader::FRAGMENT, gl3TextFragmentShader));
>      
>      osg::ref_ptr<osg::Uniform> textTexture = new osg::Uniform("GlyphTexture",0);
>
>      osg::StateSet* ss = geode->getOrCreateStateSet();
>      ss->addUniform(textTexture);
>      ss->setAttributeAndModes(program, osg::StateAttribute::ON);
>
>
>
>
> But the result is the same.
> What I am doing wrong?
>
> Cheers,
> Benjamin
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=68255#68255
>
>
>
>
>
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