void RenderText(GLfloat x, GLfloat y, const oglplus::String& text)
{
using namespace oglplus;
glyph_spacings.resize(text.size()+1);
text_glyphs.GetSpacing(
PathNVListMode::AccumAdjacentPairs,
text,
1.0f, 1.0f,
PathNVTransformType::TranslateX,
glyph_spacings
);
glyph_spacings.insert(glyph_spacings.begin(), 0);
dsa.ModelviewMatrix()
.LoadIdentity()
.Translate(x, y, 0);
text_glyphs.StencilFillInstanced(
text,
PathNVFillMode::CountUp,
0xFF,
PathNVTransformType::TranslateX,
glyph_spacings
);
text_glyphs.CoverFillInstanced(
text,
PathNVFillCoverMode::BoundingBoxOfBoundingBoxes,
PathNVTransformType::TranslateX,
glyph_spacings
);
}
TextExample(int /*argc*/, const char** /*argv*/)
: text("OpenGL")
, text_path(text.size())
, glyph_indices(make_glyph_indices())
, glyph_spacings(glyph_indices.size()) {
using namespace oglplus;
GLfloat font_scale = 64;
text_path.Glyphs(
PathNVFontTarget::Standard,
"Sans",
PathNVFontStyle::Bold,
text,
PathNVMissingGlyph::Use,
~0,
font_scale);
text_path.GetSpacing(
PathNVListMode::AccumAdjacentPairs,
glyph_indices,
1.0f,
1.0f,
PathNVTransformType::TranslateX,
glyph_spacings);
glyph_spacings.insert(glyph_spacings.begin(), 0);
glyph_spacings.pop_back();
glyph_indices.pop_back();
GLfloat text_left = glyph_spacings.front();
GLfloat text_right = glyph_spacings.back();
GLfloat font_min_max[2];
text_path.GetMetricRange(
PathNVMetricQuery::FontYMinBounds | PathNVMetricQuery::FontYMaxBounds,
1,
0,
font_min_max);
projection.Ortho(
text_left - 10,
text_right + 10,
font_min_max[0],
font_min_max[1],
-1.0,
+1.0);
modelview.LoadIdentity();
gl.ClearColor(1.0f, 1.0f, 1.0f, 0.0f);
gl.ClearStencil(0);
gl.StencilMask(~0);
gl.StencilFunc(CompareFunction::NotEqual, 0, 0xFF);
gl.StencilOp(
StencilOperation::Keep,
StencilOperation::Keep,
StencilOperation::Zero);
gl.Enable(Capability::StencilTest);
}