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Added support for GL3/GLES3, GL2,GLE2 shaders to osgText::Font/Text.

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This commit is contained in:
Robert Osfield
2017-03-18 18:08:12 +00:00
parent 279cc82a01
commit c7711fd2d4
2 changed files with 100 additions and 3 deletions
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89
src/osgText/Font.cpp
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@@ -34,6 +34,67 @@ using namespace std;
static osg::ApplicationUsageProxy Font_e0(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_TEXT_INCREMENTAL_SUBLOADING <type>","ON | OFF");
#define FIXED_FUNCTION defined(OSG_GL_FIXED_FUNCTION_AVAILABLE)
#define SHADERS_GL3 (defined(OSG_GL3_AVAILABLE) || defined(OSG_GLES3_AVAILABLE))
#define SHADERS_GL2 !FIXED_FUNCTION && !SHADERS_GL3
#if SHADERS_GL3
static const char* gl3_TextVertexShader = {
"#version 330 core\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* gl3_TextFragmentShader = {
"#version 330 core\n"
"uniform sampler2D glyphTexture;\n"
"in vec2 texCoord;\n"
"in vec4 vertexColor;\n"
"out vec4 color;\n"
"void main(void)\n"
"{\n"
" if (texCoord.x>=0.0) color = vertexColor * vec4(1.0, 1.0, 1.0, texture(glyphTexture, texCoord).r);\n"
" else color = vertexColor;\n"
"}\n"
};
#endif
#if SHADERS_GL2
static const char* gl2_TextVertexShader = {
"varying vec2 texCoord;\n"
"varying vec4 vertexColor;\n"
"void main(void)\n"
"{\n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
" texCoord = gl_MultiTexCoord0.xy;\n"
" vertexColor = gl_Color; \n"
"}\n"
};
static const char* gl2_TextFragmentShader = {
"uniform sampler2D glyphTexture;\n"
"varying vec2 texCoord;\n"
"varying vec4 vertexColor;\n"
"void main(void)\n"
"{\n"
" if (texCoord.x>=0.0) gl_FragColor = vertexColor * vec4(1.0, 1.0, 1.0, texture2D(glyphTexture, texCoord).a);\n"
" else gl_FragColor = vertexColor;\n"
"}\n"
};
#endif
osg::ref_ptr<Font>& Font::getDefaultFont()
{
@@ -240,14 +301,40 @@ Font::Font(FontImplementation* implementation):
_texenv = new osg::TexEnv;
_stateset = new osg::StateSet;
_stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
_stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
_stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
#if defined(OSG_GL_FIXED_FUNCTION_AVAILABLE)
#if FIXED_FUNCTION
OSG_NOTICE<<"Font::Font() Fixed function pipeline"<<std::endl;
_stateset->setTextureMode(0, GL_TEXTURE_2D, osg::StateAttribute::ON);
#endif
#if SHADERS_GL3
OSG_NOTICE<<"Font::Font() Setting up GL3 compatible shaders"<<std::endl;
osg::ref_ptr<osg::Program> program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::VERTEX, gl3_TextVertexShader));
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, gl3_TextFragmentShader));
_stateset->setAttributeAndModes(program.get());
_stateset->addUniform(new osg::Uniform("glyphTexture", 0));
#elif SHADERS_GL2
OSG_NOTICE<<"Font::Font() Setting up GL2 compatible shaders"<<std::endl;
osg::ref_ptr<osg::Program> program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::VERTEX, gl2_TextVertexShader));
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, gl2_TextFragmentShader));
_stateset->setAttributeAndModes(program.get());
_stateset->addUniform(new osg::Uniform("glyphTexture", 0));
#endif
char *ptr;
if( (ptr = getenv("OSG_MAX_TEXTURE_SIZE")) != 0)
{