Example(GLuint width, GLuint height)
: log_sink(
[](const oglplus::ARB_debug_output::CallbackData& data) -> void
{
std::cout << "[" << data.id << "] '" <<
data.message << "'" << std::endl;
std::cout << " [source] '" <<
oglplus::EnumValueName(data.source) << "'" <<
std::endl;
std::cout << " [type] '" <<
oglplus::EnumValueName(data.type) << "'" <<
std::endl;
std::cout << " [severity] '" <<
oglplus::EnumValueName(data.severity) << "'" <<
std::endl;
}
)
{
using namespace oglplus;
dbg.Control(
DebugOutputARBSource::DontCare,
DebugOutputARBType::DontCare,
DebugOutputARBSeverity::Low,
true
);
gl.ClearColor(1.0f, 1.0f, 1.0f, 0.0f);
gl.Viewport(width, height);
glc.MatrixMode(CompatibilityMatrixMode::Projection);
glc.LoadIdentity();
glc.MatrixMode(CompatibilityMatrixMode::Modelview);
glc.LoadIdentity();
}
DSATextureExample(int /*argc*/, const char** /*argv*/)
: gl()
, prog(make_prog())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
, textured_cube(
oglplus::List("Position")("Normal")("TexCoord").Get(),
oglplus::shapes::Cube(),
prog
)
{
using namespace oglplus;
checker.target = Texture::Target::_2D;
checker.Image2D(images::CheckerRedBlack(256, 256, 8, 8));
checker.GenerateMipmap();
checker.MinFilter(TextureMinFilter::LinearMipmapLinear);
checker.MagFilter(TextureMagFilter::Linear);
checker.Anisotropy(2.0);
checker.WrapS(TextureWrap::Repeat);
checker.WrapT(TextureWrap::Repeat);
checker.Bind();
(prog/"Checker") = 0;
(prog/"LightPos") = Vec3f(10.0f, 20.0f, 30.0f);
gl.ClearColor(0.3f, 0.3f, 0.3f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
}
//------------------------------------------------------------------------------
void Example::RenderFrame(double /*time*/)
{
bool dragging = mouse_left_down || mouse_middle_down;
if(dragging && (frame_no % 2))
{
gl.Scissor(
mouse_x-screen_width/(view_divs*2),
mouse_y-screen_height/(view_divs*2),
screen_width/view_divs,
screen_height/view_divs
);
}
else
{
unsigned this_tile = view_tile_index[view_tile];
gl.Scissor(
(this_tile % view_divs)*screen_width/view_divs,
(this_tile / view_divs)*screen_height/view_divs,
screen_width/view_divs+1,
screen_height/view_divs+1
);
if(++view_tile >= (dragging?view_divs:view_divs*view_divs))
{
view_tile = 0;
}
}
screen.Draw();
++frame_no;
}
void Render(void)
{
using namespace oglplus;
double t = FrameTime();
gl.Clear().ColorBuffer().DepthBuffer();
//
auto camera = CamMatrixf::Orbiting(
camera_target,
camera_distance,
-FullCircles(t / 17.0),
Degrees(SineWave(t / 41.0) * 85)
);
camera_matrix.Set(camera);
camera_position.Set(camera.Position());
light_position.Set(
CamMatrixf::Orbiting(
camera_target,
camera_distance*2.0,
FullCircles(t / 37.0),
Degrees(SineWave(t / 31.0) * 85)
).Position()
);
face_normals.Set(int(t*0.25) % 2);
gl.DrawElements(
PrimitiveType::TriangleFan,
element_count,
DataType::UnsignedInt
);
}
void drawScene() {
gl.ClearColor(0.2, 0.2, 0.2, 1.0);
gl.Clear().ColorBuffer().DepthBuffer();
gl.Viewport(0, 0, 640, 480);
// draw GUI
System::getSingleton().renderAllGUIContexts();
}
void Render(void)
{
gl.Clear().ColorBuffer();
gl.DrawArrays(
oglplus::PrimitiveType::Triangles,
0, 3
);
}
void FullscreenQuad::DrawElements() const
{
static oglplus::Context gl;
fsQuadVertexArray.Bind();
gl.DrawElements(
oglplus::PrimitiveType::Triangles, 6,
oglplus::DataType::UnsignedInt
);
}
void Render() {
using namespace oglplus;
gl.Clear().ColorBuffer().StencilBuffer();
glc.Color(0.2, 0.2, 1.0);
text_path.StencilFillInstanced(
glyph_indices,
PathNVFillMode::CountUp,
0xFF,
PathNVTransformType::TranslateX,
glyph_spacings);
text_path.CoverFillInstanced(
glyph_indices,
PathNVFillCoverMode::BoundingBoxOfBoundingBoxes,
PathNVTransformType::TranslateX,
glyph_spacings);
glc.Color(0.0, 0.0, 0.0);
text_path.StencilStrokeInstanced(
glyph_indices,
1,
~0,
PathNVTransformType::TranslateX,
glyph_spacings);
text_path.CoverStrokeInstanced(
glyph_indices,
PathNVStrokeCoverMode::ConvexHull,
PathNVTransformType::TranslateX,
glyph_spacings);
}
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));
}
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
);
}
void Render(void)
{
gl.Clear().ColorBuffer().DepthBuffer();
//
oglplus::Uniform<GLfloat>(prog, "Time") = FrameTime();
// draw 36 instances of the cube
// the vertex shader will take care of their placement
cube_instr.Draw(cube_indices, 36);
}
//------------------------------------------------------------------------------
void Example::Resize(int width, int height)
{
if((width > 0) && (height > 0))
{
screen_width = width;
screen_height = height;
view_aspect = float(width)/float(height);
}
gl.Viewport(0, 0, width, height);
}
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 Display(void)
{
using namespace oglplus;
gl.BlitFramebuffer(
0, 0, width, height,
0, height, width, 0,
BufferSelectBit::ColorBuffer,
BlitFilter::Nearest
);
}
void Reshape(void)
{
using namespace oglplus;
gl.Viewport(Width(), Height());
projection_matrix.Set(
CamMatrixf::PerspectiveX(
Degrees(60),
Aspect(),
1, 50
)
);
}
void Reshape(void)
{
using namespace oglplus;
gl.Viewport(Width(), Height());
Uniform<Mat4f>(prog, "ProjectionMatrix").Set(
CamMatrixf::PerspectiveX(
Degrees(60),
Aspect(),
1, 70
)
);
}
void Reshape(void)
{
gl.Viewport(Width(), Height());
auto camera = glm::perspective(
53.0f,
GLfloat(Aspect()),
1.0f, 100.0f
) * glm::lookAt(
glm::vec3(21.0f, 7.0f, 0.0f),
glm::vec3( 0.0f, 0.0f, 0.0f),
glm::vec3( 0.0f, 1.0f, 0.0f)
);
oglplus::Uniform<oglplus::Mat4f>(prog, "CameraMatrix").Set(camera);
}
PathExample(int, const char**)
{
using namespace oglplus;
PathNVCommand commands[] = {
PathNVCommand::MoveTo,
PathNVCommand::LineTo,
PathNVCommand::LineTo,
PathNVCommand::LineTo,
PathNVCommand::LineTo,
PathNVCommand::Close
};
GLfloat coords[] = {
0.00, 0.85,
0.65,-0.80,
-0.85, 0.30,
0.85, 0.30,
-0.65,-0.80
};
path.Commands(
sizeof(commands)/sizeof(commands[0]),
commands,
sizeof(coords)/sizeof(coords[0]),
coords
);
path.StrokeWidth(0.01);
path.JoinStyle(PathNVJoinStyle::Round);
GLfloat dash_array[] = {0.05, 0.02};
path.DashArray(
sizeof(dash_array)/sizeof(dash_array[0]),
dash_array
);
glc.MatrixMode(CompatibilityMatrixMode::Projection);
glc.LoadIdentity();
glc.MatrixMode(CompatibilityMatrixMode::Modelview);
glc.LoadIdentity();
gl.ClearColor(1.0f, 1.0f, 1.0f, 0.0f);
gl.ClearStencil(0);
gl.StencilMask(~0);
gl.StencilFunc(CompareFunction::NotEqual, 0, 0x1F);
gl.StencilOp(
StencilOperation::Keep,
StencilOperation::Keep,
StencilOperation::Zero
);
gl.Enable(Capability::StencilTest);
}
void Render(void)
{
using namespace oglplus;
gl.Clear().ColorBuffer().StencilBuffer();
glc.Color(0.2, 0.2, 1.0);
path.StencilFill(PathNVFillMode::CountUp, 0x1F);
path.CoverFill(PathNVFillCoverMode::BoundingBox);
glc.Color(0.1, 0.1, 0.1);
path.StencilStroke(1, ~0);
path.CoverStroke(PathNVStrokeCoverMode::ConvexHull);
}
void Display(void)
{
using namespace oglplus;
gl.Clear().ColorBuffer();
glc.Begin(CompatibilityPrimitiveType::Triangles);
glc.Color(1.0, 0.0, 0.0);
glc.Vertex(0.0f, 0.0f);
glc.Color(0.0, 1.0, 0.0);
glc.Vertex(1.0f, 0.0f);
glc.Color(0.0, 0.0, 1.0);
glc.Vertex(0.0f, 1.0f);
glc.End();
}
void Render(void)
{
using namespace oglplus;
gl.Clear().ColorBuffer().StencilBuffer();
auto h = Height();
int l = font_height / 2, i = 1;
RenderText(l, h - font_height*i++, "NV_path_rendering");
{
std::stringstream s;
s << "Frame no.: " << FrameNumber();
RenderText(l, h - font_height*i++, s.str());
}
{
std::stringstream s;
s << std::fixed << std::setprecision(2);
s << "Time: " << FrameTime() << " [s]";
RenderText(l, h - font_height*i++, s.str());
}
{
std::stringstream s;
s << std::fixed << std::setprecision(2);
s << "Average FPS: " << (FrameTime()>0.0 ? AverageFPS() : 0.0);
RenderText(l, h - font_height*i++, s.str());
}
{
std::stringstream s;
s << std::fixed << std::setprecision(2);
s << "Current FPS: " << (FrameDuration()>0.0 ? CurrentFPS() : 0.0);
RenderText(l, h - font_height*i++, s.str());
}
{
std::stringstream s;
s << "Viewport: " << Width() << " x " << Height();
RenderText(l, h - font_height*i++, s.str());
}
{
std::stringstream s;
s << std::fixed << std::setprecision(3);
s << "Aspect ratio: " << Aspect();
RenderText(l, h - font_height*i++, s.str());
}
}
void Render(void)
{
using namespace oglplus;
gl.Clear().ColorBuffer().DepthBuffer();
camera_matrix.Set(
CamMatrixf::Orbiting(
Vec3f(),
9.5 - SineWave(FrameTime() / 6.0) * 7.0,
FullCircles(FrameTime() / 9.0),
Degrees(SineWave(FrameTime() / 30.0) * 90)
)
);
model_matrix.Set(ModelMatrixf::RotationX(FullCircles(FrameTime() * 0.1)));
textured_cube.Draw();
}
void Reshape(void)
{
using namespace oglplus;
gl.Viewport(Width(), Height());
dsa.ProjectionMatrix()
.LoadIdentity()
.Ortho(0, Width(), 0, Height(), -1, 1);
GLfloat font_min_max[2];
text_glyphs.GetMetricRange(
PathNVMetricQuery::FontYMinBounds|
PathNVMetricQuery::FontYMaxBounds,
1, 0,
font_min_max
);
font_y_min = font_min_max[0];
font_y_max = font_min_max[1];
font_height = font_y_max - font_y_min;
}
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);
}
TriangleExample(void)
: gl()
, prog(make_prog())
{
triangle.Bind();
GLfloat triangle_pos[9] = {
-1.0f,-1.0f, 0.0f,
1.0f,-1.0f, 0.0f,
-1.0f, 1.0f, 0.0f
};
positions.Bind(oglplus::Buffer::Target::Array);
oglplus::Buffer::Data(
oglplus::Buffer::Target::Array,
triangle_pos
);
oglplus::VertexAttribArray(prog, "Position")
.Setup<GLfloat>(3)
.Enable();
gl.ClearColor(1.0, 0.0, 1.0, 0.0);
}
TextExample(int /*argc*/, const char** /*argv*/)
: text_glyphs(128)
{
using namespace oglplus;
GLfloat font_scale = 48;
text_glyphs.GlyphRange(
PathNVFontTarget::Standard,
"Sans",
PathNVFontStyle::Bold,
0, 128,
PathNVMissingGlyph::Use,
~0,
font_scale
);
GLfloat color_gen_coeffs[9] = {
-0.6f, 0.0f, 0.8f,
0.0f, 0.0f, 0.0f,
0.5f, 0.0f, 0.5f
};
npr.ColorGen(
PathNVColor::Primary,
PathNVGenMode::ObjectBoundingBox,
PathNVColorFormat::RGB,
color_gen_coeffs
);
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);
}
BitmapGlyphExample(int argc, const char** argv)
: gl()
, tr(0, 1, 2)
, font(tr.LoadFont((argc>1)?argv[1]:"Sans"))
, oglp_layout(tr.MakeLayout(font, "OGLplus"))
#if !OGLPLUS_NO_UNICODE_LITERALS
, desc_layout(tr.MakeLayout(font, u8"a C++ wrapper for OpenGL©"))
#else
, desc_layout(tr.MakeLayout(font, "a C++ wrapper for OpenGL(c)"))
#endif
, time_layout(tr.MakeLayout(font, 25))
, rndr(tr.GetRenderer(
oglplus::GeometryShader(
oglplus::ObjectDesc("Layout transform"),
"#version 150\n"
"uniform mat4 ProjectionMatrix,CameraMatrix,LayoutMatrix;"
"mat4 Matrix = ProjectionMatrix*CameraMatrix*LayoutMatrix;"
"vec4 TransformLayout(vec3 GlyphPosition)"
"{"
" return Matrix * vec4(GlyphPosition, 1.0);"
"}"
),
oglplus::GeometryShader(
oglplus::ObjectDesc("Glyph transform"),
"#version 150\n"
"uniform float Time;"
"vec3 TransformGlyph("
" vec4 LogicalMetrics,"
" vec4 InkMetrics,"
" vec2 Pos,"
" float XOffs,"
" float LayoutWidth,"
" int Idx"
")"
"{"
" float a = Idx*0.7+Time*2.4;"
" return vec3("
" Pos.x+XOffs,"
" Pos.y+sin(a)*0.1,"
" cos(a)*0.05"
" );"
"}"
),
oglplus::FragmentShader(
oglplus::ObjectDesc("Pixel color"),
"#version 150\n"
"vec4 PixelColor("
" vec4 TexelColor,"
" vec3 GlyphPosition,"
" float GlyphXOffset,"
" vec2 GlyphExtent,"
" vec2 GlyphCoord,"
" float LayoutWidth"
")"
"{"
" float g = GlyphXOffset / LayoutWidth - GlyphCoord.x;"
" vec3 Color = mix("
" vec3(1.0, 0.2+0.8*g, 0.2), "
" vec3(0.2, 0.2+0.8*g, 1.0), "
" (GlyphPosition.z+0.1)/0.2"
" );"
" return vec4(Color, TexelColor.r);"
"}"
)
)
), rndr_projection_matrix(rndr.GetUniform<oglplus::Mat4f>("ProjectionMatrix"))
, rndr_camera_matrix(rndr.GetUniform<oglplus::Mat4f>("CameraMatrix"))
, rndr_layout_matrix(rndr.GetUniform<oglplus::Mat4f>("LayoutMatrix"))
, rndr_time(rndr.GetUniform<GLfloat>("Time"))
{
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
);
}
GLMBoxesExample(int, const char**)
: cube_instr(make_cube.Instructions())
, cube_indices(make_cube.Indices())
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 CameraMatrix, ScaleMatrix;"
"uniform vec3 LightPos;"
"uniform float Time;"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 vertColor;"
"void main(void)"
"{"
" float angle = gl_InstanceID * 10 * 2 * 3.14159 / 360.0;"
" float ct = cos(angle+Time);"
" float st = sin(angle+Time);"
" mat4 ModelMatrix = mat4("
" ct, 0.0, st, 0.0,"
" 0.0, 1.0, 0.0, 0.0,"
" -st, 0.0, ct, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" ) * mat4("
" 1.0, 0.0, 0.0, 0.0,"
" 0.0, 1.0, 0.0, 0.0,"
" 0.0, 0.0, 1.0, 0.0,"
" 12.0, 0.0, 0.0, 1.0 "
" ) * mat4("
" ct, -st, 0.0, 0.0,"
" st, ct, 0.0, 0.0,"
" 0.0, 0.0, 1.0, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" );"
" gl_Position = "
" ModelMatrix *"
" ScaleMatrix *"
" Position;"
" vec3 vertLightDir = normalize(LightPos - gl_Position.xyz);"
" vec3 vertNormal = normalize(("
" ModelMatrix *"
" vec4(Normal, 0.0)"
" ).xyz);"
" gl_Position = CameraMatrix * gl_Position;"
" vertColor = abs(normalize("
" Normal -"
" vec3(1.0, 1.0, 1.0) +"
" Position.xyz*0.2"
" )) * (0.6 + 0.5*max(dot(vertNormal, vertLightDir), 0.0));"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"in vec3 vertColor;"
"out vec3 fragColor;"
"void main(void)"
"{"
" fragColor = vertColor;"
"}"
);
// 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 cube
cube.Bind();
// bind the VBO for the cube vertex positions
positions.Bind(oglplus::Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Positions(data);
// upload the data
oglplus::Buffer::Data(oglplus::Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
oglplus::VertexArrayAttrib attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VBO for the cube normals
normals.Bind(oglplus::Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Normals(data);
// upload the data
oglplus::Buffer::Data(oglplus::Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
oglplus::VertexArrayAttrib attr(prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
//
gl.ClearColor(0.8f, 0.8f, 0.8f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(oglplus::Capability::DepthTest);
oglplus::Uniform<oglplus::Vec3f>(prog, "LightPos").Set(
glm::vec3(7.0, 3.0, -1.0)
);
oglplus::Uniform<oglplus::Mat4f>(prog, "ScaleMatrix").Set(
glm::scale(glm::mat4(1.0), glm::vec3(1.0, 0.3, 1.7))
);
}
BlenderMeshExample(int argc, const char* argv[])
: prog()
, camera_matrix(prog, "CameraMatrix")
, light_position(prog, "LightPosition")
, camera_position(prog, "CameraPosition")
, face_normals(prog, "FaceNormals")
, element_count(0)
{
using namespace oglplus;
VertexShader vs;
vs.Source(
"#version 330\n"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 LightPosition, CameraPosition;"
"mat4 Matrix = ProjectionMatrix * CameraMatrix;"
"in vec3 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"out vec3 vertLightDir;"
"out vec3 vertViewDir;"
"void main(void)"
"{"
" vertNormal = Normal;"
" vertLightDir = LightPosition - Position;"
" vertViewDir = CameraPosition - Position;"
" gl_Position = Matrix * vec4(Position, 1.0);"
"}"
);
vs.Compile();
prog.AttachShader(vs);
GeometryShader gs;
gs.Source(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices=3) out;"
"uniform bool FaceNormals;"
"in vec3 vertNormal[3];"
"in vec3 vertLightDir[3];"
"in vec3 vertViewDir[3];"
"out vec3 geomNormal;"
"out vec3 geomLightDir;"
"out vec3 geomViewDir;"
"void main(void)"
"{"
" vec3 fn;"
" if(FaceNormals)"
" {"
" vec3 p0 = gl_in[0].gl_Position.xyz;"
" vec3 p1 = gl_in[1].gl_Position.xyz;"
" vec3 p2 = gl_in[2].gl_Position.xyz;"
" fn = normalize(cross(p1-p0, p2-p0));"
" }"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = gl_in[v].gl_Position;"
" if(FaceNormals) geomNormal = fn;"
" else geomNormal = vertNormal[v];"
" geomLightDir = vertLightDir[v];"
" geomViewDir = vertViewDir[v];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
prog.AttachShader(gs);
FragmentShader fs;
fs.Source(
"#version 330\n"
"in vec3 geomNormal;"
"in vec3 geomLightDir;"
"in vec3 geomViewDir;"
"out vec3 fragColor;"
"void main(void)"
"{"
" vec3 LightColor = vec3(1.0, 1.0, 1.0);"
" vec3 MatColor = vec3(0.5, 0.5, 0.5);"
" vec3 LightRefl = reflect(-geomLightDir, geomNormal);"
" float Ambient = 0.3;"
" float Diffuse = max(dot("
" normalize(geomNormal),"
" normalize(geomLightDir)"
" ), 0.0);"
" float Contour = pow((1.0 - max(dot("
" normalize(geomNormal),"
" normalize(geomViewDir)"
" )-0.1, 0.0))*1.05, 4.0);"
" float Specular = pow(clamp(dot("
" normalize(geomViewDir),"
" normalize(LightRefl)"
" )+0.005, 0.0, 0.98), 64.0);"
" fragColor = MatColor * LightColor * (Contour + Diffuse + Ambient)+"
" LightColor * Specular;"
"}"
);
fs.Compile();
prog.AttachShader(fs);
prog.Link();
prog.Use();
gl.PrimitiveRestartIndex(0);
// vectors with vertex position and normals
// the values at index 0 is unused
// 0 is used as primitive restart index
std::vector<GLfloat> pos_data(3, 0.0);
std::vector<GLfloat> nml_data(3, 0.0);
// index offset starting at 1
GLuint index_offset = 1;
// vectors with vertex indices
std::vector<GLuint> idx_data(1, 0);
// open an input stream
std::ifstream input(argc>1? argv[1]: "./test.blend");
// check if we succeeded
if(!input.good())
throw std::runtime_error("Error opening file for reading");
// parse the input stream
imports::BlendFile blend_file(input);
// get the file's global block
auto glob_block = blend_file.StructuredGlobalBlock();
// get the default scene
auto scene_data = blend_file[glob_block.curscene];
//
// get the pointer to the first object in the scene
auto object_link_ptr = scene_data.Field<void*>("base.first").Get();
// and go through the whole list of objects
while(object_link_ptr)
{
// for each list element open the linked list block
auto object_link_data = blend_file[object_link_ptr];
// get the pointer to its object
auto object_ptr = object_link_data.Field<void*>("object").Get();
// open the object block (if any)
if(object_ptr) try
{
auto object_data = blend_file[object_ptr];
// get the data pointer
auto object_data_ptr = object_data.Field<void*>("data").Get();
// open the data block (if any)
if(object_data_ptr)
{
auto object_data_data = blend_file[object_data_ptr];
// if it is a mesh
if(object_data_data.StructureName() == "Mesh")
{
// get the object matrix field
auto object_obmat_field = object_data.Field<float>("obmat");
// make a transformation matrix
Mat4f obmat(
object_obmat_field.Get(0, 0),
object_obmat_field.Get(0, 4),
object_obmat_field.Get(0, 8),
object_obmat_field.Get(0,12),
object_obmat_field.Get(0, 1),
object_obmat_field.Get(0, 5),
object_obmat_field.Get(0, 9),
object_obmat_field.Get(0,13),
object_obmat_field.Get(0, 2),
object_obmat_field.Get(0, 6),
object_obmat_field.Get(0,10),
object_obmat_field.Get(0,14),
object_obmat_field.Get(0, 3),
object_obmat_field.Get(0, 7),
object_obmat_field.Get(0,11),
object_obmat_field.Get(0,15)
);
// the number of vertices
std::size_t n_verts = 0;
// get the vertex block pointer
auto vertex_ptr = object_data_data.Field<void*>("mvert").Get();
// open the vertex block (if any)
if(vertex_ptr)
{
auto vertex_data = blend_file[vertex_ptr];
// get the number of vertices in the block
n_verts = vertex_data.BlockElementCount();
// get the vertex coordinate and normal fields
auto vertex_co_field = vertex_data.Field<float>("co");
auto vertex_no_field = vertex_data.Field<short>("no");
// make two vectors of position and normal data
std::vector<GLfloat> ps(3 * n_verts);
std::vector<GLfloat> ns(3 * n_verts);
for(std::size_t v=0; v!=n_verts; ++v)
{
// (transpose y and z axes)
// get the positional coordinates
Vec4f position(
vertex_co_field.Get(v, 0),
vertex_co_field.Get(v, 1),
vertex_co_field.Get(v, 2),
1.0f
);
Vec4f newpos = obmat * position;
ps[3*v+0] = newpos.x();
ps[3*v+1] = newpos.z();
ps[3*v+2] =-newpos.y();
// get the normals
Vec4f normal(
vertex_no_field.Get(v, 0),
vertex_no_field.Get(v, 1),
vertex_no_field.Get(v, 2),
0.0f
);
Vec4f newnorm = obmat * normal;
ns[3*v+0] = newnorm.x();
ns[3*v+1] = newnorm.z();
ns[3*v+2] =-newnorm.y();
}
// append the values
pos_data.insert(pos_data.end(), ps.begin(), ps.end());
nml_data.insert(nml_data.end(), ns.begin(), ns.end());
}
// get the face block pointer
auto face_ptr = object_data_data.Field<void*>("mface").Get();
// open the face block (if any)
if(face_ptr)
{
auto face_data = blend_file[face_ptr];
// get the number of faces in the block
std::size_t n_faces = face_data.BlockElementCount();
// get the vertex index fields of the face
auto face_v1_field = face_data.Field<int>("v1");
auto face_v2_field = face_data.Field<int>("v2");
auto face_v3_field = face_data.Field<int>("v3");
auto face_v4_field = face_data.Field<int>("v4");
// make a vector of index data
std::vector<GLuint> is(5 * n_faces);
for(std::size_t f=0; f!=n_faces; ++f)
{
// get face vertex indices
int v1 = face_v1_field.Get(f);
int v2 = face_v2_field.Get(f);
int v3 = face_v3_field.Get(f);
int v4 = face_v4_field.Get(f);
is[5*f+0] = v1+index_offset;
is[5*f+1] = v2+index_offset;
is[5*f+2] = v3+index_offset;
is[5*f+3] = v4?v4+index_offset:0;
is[5*f+4] = 0; // primitive restart index
}
// append the values
idx_data.insert(idx_data.end(), is.begin(), is.end());
}
// get the poly block pointer
auto poly_ptr = object_data_data.TryGet<void*>("mpoly", nullptr);
// and the loop block pointer
auto loop_ptr = object_data_data.TryGet<void*>("mloop", nullptr);
// open the poly and loop blocks (if we have both)
if(poly_ptr && loop_ptr)
{
auto poly_data = blend_file[poly_ptr];
auto loop_data = blend_file[loop_ptr];
// get the number of polys in the block
std::size_t n_polys = poly_data.BlockElementCount();
// get the fields of poly and loop
auto poly_loopstart_field = poly_data.Field<int>("loopstart");
auto poly_totloop_field = poly_data.Field<int>("totloop");
auto loop_v_field = loop_data.Field<int>("v");
// make a vector of index data
std::vector<GLuint> is;
for(std::size_t f=0; f!=n_polys; ++f)
{
int ls = poly_loopstart_field.Get(f);
int tl = poly_totloop_field.Get(f);
for(int l=0; l!=tl; ++l)
{
int v = loop_v_field.Get(ls+l);
is.push_back(v+index_offset);
}
is.push_back(0); // primitive restart index
}
// append the values
idx_data.insert(idx_data.end(), is.begin(), is.end());
}
index_offset += n_verts;
}
}
}
catch(...)
{ }
// and get the pointer to the nex block
object_link_ptr = object_link_data.Field<void*>("next").Get();
}
meshes.Bind();
positions.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, pos_data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(3);
attr.Enable();
}
normals.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, nml_data);
VertexAttribArray attr(prog, "Normal");
attr.Setup<GLfloat>(3);
attr.Enable();
}
indices.Bind(Buffer::Target::ElementArray);
Buffer::Data(Buffer::Target::ElementArray, idx_data);
element_count = idx_data.size();
// find the extremes of the mesh(es)
GLfloat min_x = pos_data[3], max_x = pos_data[3];
GLfloat min_y = pos_data[4], max_y = pos_data[4];
GLfloat min_z = pos_data[5], max_z = pos_data[5];
for(std::size_t v=1, vn=pos_data.size()/3; v!=vn; ++v)
{
GLfloat x = pos_data[v*3+0];
GLfloat y = pos_data[v*3+1];
GLfloat z = pos_data[v*3+2];
if(min_x > x) min_x = x;
if(min_y > y) min_y = y;
if(min_z > z) min_z = z;
if(max_x < x) max_x = x;
if(max_y < y) max_y = y;
if(max_z < z) max_z = z;
}
// position the camera target
camera_target = Vec3f(
(min_x + max_x) * 0.5,
(min_y + max_y) * 0.5,
(min_z + max_z) * 0.5
);
// and calculate a good value for camera distance
camera_distance = 1.1*Distance(camera_target, Vec3f(min_x, min_y, min_z))+1.0;
gl.ClearColor(0.17f, 0.22f, 0.17f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::PrimitiveRestart);
}