void Render() {
using namespace oglplus;
gl.Clear().ColorBuffer().DoIt();
GLfloat t = GLfloat(FrameTime());
rndr.Use();
text_stream.str(std::string());
text_stream << "Time: " << std::fixed << std::setw(5)
<< std::setprecision(3) << t << " [s]";
if(time_str != text_stream.str()) {
time_str = text_stream.str();
time_layout.Set(time_str);
}
rndr.SetCamera(CamMatrixf::Orbiting(
Vec3f(),
GLfloat(9.0 + SineWave(t / 7.0) * 3.0),
-FullCircles(t / 17.0),
Degrees(SineWave(t / 21.0) * 35)));
rndr.SetLayoutTransform(ModelMatrixf::Translation(-3.0f, 0.7f, 1.1f));
rndr.Render(oglp_layout);
rndr.SetLayoutTransform(ModelMatrixf::Translation(-6.0f, -0.7f, 0.0f));
rndr.Render(desc_layout);
rndr.SetLayoutTransform(
ModelMatrixf::Translation(-4.0f, -2.0f, -0.5f) *
ModelMatrixf::Scale(0.7f, 0.7f, 0.5f));
rndr.Render(time_layout);
}
void Reshape() {
using namespace oglplus;
gl.Viewport(Width(), Height());
rndr.SetProjection(
CamMatrixf::PerspectiveX(Degrees(60), Width() / Height(), 1, 60));
}
PangoCairoTextExample(int argc, const char** argv)
: gl()
, tr(0)
, font(tr.LoadFont((argc>2)?argv[2]:"Sans 38"))
, layout(tr.MakeLayout(font, 48))
, rndr(tr.GetRenderer(
oglplus::FragmentShader(
oglplus::ObjectDesc("Pixel color"),
"#version 330\n"
"uniform vec3 Color;"
"uniform float Opacity;"
"vec4 PixelColor("
" vec4 TexelColor,"
" vec3 GlyphPosition,"
" float GlyphXOffset,"
" vec2 GlyphExtent,"
" vec2 GlyphCoord,"
" float LayoutWidth"
")"
"{"
" return vec4(Color, TexelColor.r*Opacity);"
"}"
)
)
), rndr_color(rndr.GetUniform<oglplus::Vec3f>("Color"))
, rndr_opacity(rndr.GetUniform<GLfloat>("Opacity"))
, prev_interval(-1)
, current_line(0)
{
using namespace oglplus;
rndr.Use();
gl.ClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.Enable(Capability::Blend);
gl.BlendFunc(
BlendFunction::SrcAlpha,
BlendFunction::DstAlpha
);
rndr.SetAlignment(text::Alignment::Center);
}
void Render(void)
{
using namespace oglplus;
GLfloat t = GLfloat(FrameTime());
GLfloat i = t*0.3f;
int interval = int(i);
GLfloat f = i - GLfloat(interval);
if(prev_interval < interval)
{
LoadNext();
prev_interval = interval;
}
gl.Clear().ColorBuffer().DoIt();
rndr_opacity.Set(SineWave(f*0.5f));
rndr.SetLayoutTransform(ModelMatrixf::TranslationZ(-20.0f+16.0f*f));
rndr.Render(layout);
}
void LoadNext(void)
{
typedef oglplus::text::Direction Dir;
struct {
Dir direction;
const char* text;
} lines[] = {
{Dir::LeftToRight, u8"Hello world"},
{Dir::LeftToRight, u8"Nazdar svet"},
{Dir::LeftToRight, u8"Γεια σας κόσμο"},
{Dir::LeftToRight, u8"Привет мир"},
{Dir::LeftToRight, u8"Witaj świecie"},
{Dir::LeftToRight, u8"Здравей свят"},
{Dir::LeftToRight, u8"Ahoj světe"},
{Dir::LeftToRight, u8"Moi maailma"},
{Dir::LeftToRight, u8"Bonjour tout le monde"},
{Dir::LeftToRight, u8"Hallo welt"},
{Dir::LeftToRight, u8"Բարեւ աշխարհ"},
{Dir::LeftToRight, u8"Hej världen"},
{Dir::LeftToRight, u8"Прывітанне свет"},
{Dir::LeftToRight, u8"Olá mundo"},
{Dir::LeftToRight, u8"Здраво свете"},
{Dir::LeftToRight, u8"Zdravo svet"},
{Dir::LeftToRight, u8"Hola mundo"},
{Dir::LeftToRight, u8"Merhaba dünya"},
{Dir::LeftToRight, u8"Привіт світ"},
{Dir::LeftToRight, u8"Pozdrav svijetu"},
{Dir::LeftToRight, u8"Hello világ"},
{Dir::RightToLeft, u8"مرحبا العالم"},
{Dir::LeftToRight, u8"Ciao mondo"},
{Dir::LeftToRight, u8"Здраво светот"},
{Dir::RightToLeft, u8"שלום עולם"},
{Dir::LeftToRight, u8"Hei verden"}
};
const std::size_t line_count = sizeof(lines)/sizeof(lines[0]);
layout.Set(lines[current_line].text);
rndr.SetDirection(lines[current_line].direction);
rndr_color.Set(
0.1f+GLfloat(0.8f*std::rand())/RAND_MAX,
0.3f+GLfloat(0.7f*std::rand())/RAND_MAX,
0.1f+GLfloat(0.8f*std::rand())/RAND_MAX
);
if(++current_line >= line_count)
current_line = 0;
}
STBTruetypeExample(int argc, const char** argv)
: gl()
, tr(oglplus::text::STBTrueTypeRendering(0, 1, 2))
, font(tr.LoadFont((argc>1)?argv[1]:"FreeSans"))
, oglp_layout(tr.MakeLayout(font, "OGLplus"))
, desc_layout(tr.MakeLayout(font, u8"a C++ wrapper for OpenGL©"))
, time_layout(tr.MakeLayout(font, 25))
, rndr(tr.GetRenderer(
oglplus::FragmentShader(
oglplus::ObjectDesc("Pixel color"),
oglplus::StrCRef(
"#version 330\n"
"vec4 PixelColor("
" vec4 TexelColor,"
" vec3 GlyphPosition,"
" float GlyphXOffset,"
" vec2 GlyphExtent,"
" vec2 GlyphCoord,"
" float LayoutWidth"
")"
"{"
" float g = GlyphXOffset / LayoutWidth;"
" float b = GlyphCoord.y;"
" vec3 Color = mix("
" vec3(1.0, 0.2, 0.2+0.8*b), "
" vec3(0.2, 1.0, 0.2+0.8*b), "
" g"
" );"
" return vec4(Color, TexelColor.r);"
"}")
)
)
)
{
using namespace oglplus;
rndr.Use();
gl.ClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.Enable(Capability::Blend);
gl.BlendFunc(
BlendFunction::SrcAlpha,
BlendFunction::DstAlpha
);
}
