RectangleExample(void)
{
prog << "#version 330\n"
"in vec2 Position;"
"in vec3 Color;"
"out vec3 vertColor;"
"void main(void)"
"{"
" vertColor = Color;"
" gl_Position = vec4(Position, 0.0, 1.0);"
"}"_glsl_vs;
prog << "#version 330\n"
"in vec3 vertColor;"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4(vertColor, 1.0);"
"}"_glsl_fs;
prog.Link();
prog.Use();
// bind the VAO for the rectangle
rectangle.Bind();
GLfloat rectangle_verts[8] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
// bind the VBO for the rectangle vertices
verts.Bind(Buffer::Target::Array);
// upload the data
Buffer::Data(Buffer::Target::Array, 8, rectangle_verts);
// setup the vertex attribs array for the vertices
VertexAttribArray vert_attr(prog, "Position");
vert_attr.Setup(2, DataType::Float);
vert_attr.Enable();
GLfloat rectangle_colors[12] = {
0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f,
};
// bind the VBO for the rectangle colors
colors.Bind(Buffer::Target::Array);
// upload the data
Buffer::Data(Buffer::Target::Array, 12, rectangle_colors);
// setup the vertex attribs array for the vertices
VertexAttribArray color_attr(prog, "Color");
color_attr.Setup(3, DataType::Float);
color_attr.Enable();
//
gl.ClearDepth(1.0f);
}
RectangleExample(void)
: vs(ShaderType::Vertex)
, fs(ShaderType::Fragment)
{
// this could be any istream
std::stringstream vs_source(
"#version 120\n"
"attribute vec2 Position;"
"attribute vec3 Color;"
"varying vec3 vertColor;"
"void main(void)"
"{"
" vertColor = Color;"
" gl_Position = vec4(Position, 0.0, 1.0);"
"}"
);
// set the vertex shader source
vs.Source(GLSLSource::FromStream(vs_source));
// compile it
vs.Compile();
std::stringstream fs_source(
"#version 120\n"
"varying vec3 vertColor;"
"void main(void)"
"{"
" gl_FragColor = vec4(vertColor, 1.0);"
"}"
);
// set the fragment shader source
fs.Source(GLSLSource::FromStream(fs_source));
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(fs);
// link it
prog.Link();
// and use it
gl.Program.Bind(prog);
// bind the VAO for the rectangle
gl.VertexArray.Bind(rectangle);
// bind the VBO for the rectangle vertices
if(auto x = gl.Buffer.Array.Push(verts))
{
GLfloat rectangle_verts[8] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
// upload the data
gl.Buffer.Array.Data(8, rectangle_verts);
// setup the vertex attribs array for the vertices
VertexArrayAttrib vert_attr(prog, "Position");
vert_attr.Setup<Vec2f>().Enable();
}
// bind the VBO for the rectangle colors
if(auto x = gl.Buffer.Array.Push(colors))
{
GLfloat rectangle_colors[12] = {
1.0f, 1.0f, 1.0f,
1.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f,
};
// upload the data
gl.Buffer.Array.Data(12, rectangle_colors);
// setup the vertex attribs array for the vertices
VertexArrayAttrib color_attr(prog, "Color");
color_attr.Setup<Vec3f>().Enable();
}
gl.Caps.DepthTest.Disable();
}
RectangleExample(void)
: vs(ShaderType::Vertex)
, fs(ShaderType::Fragment)
{
// this could be any istream
std::stringstream vs_source(
"#version 330\n"
"in vec2 Position;"
"in vec3 Color;"
"out vec3 vertColor;"
"void main(void)"
"{"
" vertColor = Color;"
" gl_Position = vec4(Position, 0.0, 1.0);"
"}"
);
// set the vertex shader source
vs.Source(GLSLSource::FromStream(vs_source));
// compile it
vs.Compile();
std::stringstream fs_source(
"#version 330\n"
"in vec3 vertColor;"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4(vertColor, 1.0);"
"}"
);
// set the fragment shader source
fs.Source(GLSLSource::FromStream(fs_source));
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the rectangle
rectangle.Bind();
GLfloat rectangle_verts[8] = {
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
// bind the VBO for the rectangle vertices
verts.Bind(Buffer::Target::Array);
// upload the data
Buffer::Data(Buffer::Target::Array, 8, rectangle_verts);
// setup the vertex attribs array for the vertices
VertexAttribArray vert_attr(prog, "Position");
vert_attr.Setup<Vec2f>().Enable();
GLfloat rectangle_colors[12] = {
1.0f, 1.0f, 1.0f,
1.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f,
};
// bind the VBO for the rectangle colors
colors.Bind(Buffer::Target::Array);
// upload the data
Buffer::Data(Buffer::Target::Array, 12, rectangle_colors);
// setup the vertex attribs array for the vertices
VertexAttribArray color_attr(prog, "Color");
color_attr.Setup<Vec3f>().Enable();
//
gl.Disable(Capability::DepthTest);
}
