/// <summary>
/// Rendering code itself (separated for clarity).
/// </summary>
void RenderScene()
{
// Scene rendering.
if (scene != null &&
(scene.Lines > 0 || scene.Triangles > 0) && // scene is nonempty => render it
useVBO)
{
GL.LineWidth(scene.LineWidth);
// [txt] [colors] [normals] vertices
GL.BindBuffer(BufferTarget.ArrayBuffer, VBOid[0]);
IntPtr p = IntPtr.Zero;
if (useShaders)
{
SetVertexPointer(false);
SetVertexAttrib(true);
// Using GLSL shaders.
GL.UseProgram(activeProgram.Id);
// Uniforms.
Matrix4 modelView = cam.ModelView;
Matrix4 projection = cam.Projection;
Vector3 eye = cam.Eye;
GL.UniformMatrix4(activeProgram.GetUniform("matrixModelView"), false, ref modelView);
GL.UniformMatrix4(activeProgram.GetUniform("matrixProjection"), false, ref projection);
GL.Uniform3(activeProgram.GetUniform("globalAmbient"), ref globalAmbient);
GL.Uniform3(activeProgram.GetUniform("lightColor"), ref whiteLight);
GL.Uniform3(activeProgram.GetUniform("lightPosition"), ref lightPosition);
GL.Uniform3(activeProgram.GetUniform("eyePosition"), ref eye);
GL.Uniform3(activeProgram.GetUniform("Ka"), ref matAmbient);
GL.Uniform3(activeProgram.GetUniform("Kd"), ref matDiffuse);
GL.Uniform3(activeProgram.GetUniform("Ks"), ref matSpecular);
GL.Uniform1(activeProgram.GetUniform("shininess"), matShininess);
// Color handling.
bool useGlobalColor = checkGlobalColor.Checked;
if (!scene.HasColors())
{
useGlobalColor = true;
}
GL.Uniform1(activeProgram.GetUniform("globalColor"), useGlobalColor ? 1 : 0);
// Shading.
bool shadingPhong = checkPhong.Checked;
bool shadingGouraud = checkSmooth.Checked;
if (!shadingGouraud)
{
shadingPhong = false;
}
GL.Uniform1(activeProgram.GetUniform("shadingPhong"), shadingPhong ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("shadingGouraud"), shadingGouraud ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("useAmbient"), checkAmbient.Checked ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("useDiffuse"), checkDiffuse.Checked ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("useSpecular"), checkSpecular.Checked ? 1 : 0);
GlInfo.LogError("set-uniforms");
// Texture handling.
bool useTexture = checkTexture.Checked;
if (!scene.HasTxtCoords() ||
texName == 0)
{
useTexture = false;
}
GL.Uniform1(activeProgram.GetUniform("useTexture"), useTexture ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("texSurface"), 0);
if (useTexture)
{
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, texName);
}
GlInfo.LogError("set-texture");
if (activeProgram.HasAttribute("texCoords"))
{
GL.VertexAttribPointer(activeProgram.GetAttribute("texCoords"), 2, VertexAttribPointerType.Float, false, stride, p);
}
if (scene.HasTxtCoords())
{
p += Vector2.SizeInBytes;
}
if (activeProgram.HasAttribute("color"))
{
GL.VertexAttribPointer(activeProgram.GetAttribute("color"), 3, VertexAttribPointerType.Float, false, stride, p);
}
if (scene.HasColors())
{
p += Vector3.SizeInBytes;
}
if (activeProgram.HasAttribute("normal"))
{
GL.VertexAttribPointer(activeProgram.GetAttribute("normal"), 3, VertexAttribPointerType.Float, false, stride, p);
}
if (scene.HasNormals())
{
p += Vector3.SizeInBytes;
}
GL.VertexAttribPointer(activeProgram.GetAttribute("position"), 3, VertexAttribPointerType.Float, false, stride, p);
GlInfo.LogError("set-attrib-pointers");
// Index buffer.
GL.BindBuffer(BufferTarget.ElementArrayBuffer, VBOid[1]);
// Engage!
if (scene.Triangles > 0)
{
GL.DrawElements(PrimitiveType.Triangles, scene.Triangles * 3, DrawElementsType.UnsignedInt, IntPtr.Zero);
}
else
{
GL.DrawElements(PrimitiveType.Lines, scene.Lines * 2, DrawElementsType.UnsignedInt, IntPtr.Zero);
}
GlInfo.LogError("draw-elements-shader");
// Cleanup.
GL.UseProgram(0);
if (useTexture)
{
GL.BindTexture(TextureTarget.Texture2D, 0);
}
}
else
{
SetVertexAttrib(false);
SetVertexPointer(true);
// Texture handling.
bool useTexture = checkTexture.Checked;
if (!scene.HasTxtCoords() ||
texName == 0)
{
useTexture = false;
}
if (useTexture)
{
GL.Enable(EnableCap.Texture2D);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, texName);
GL.TexEnv(TextureEnvTarget.TextureEnv, TextureEnvParameter.TextureEnvMode, (int)TextureEnvMode.Replace);
}
// Using FFP.
if (scene.HasTxtCoords())
{
GL.TexCoordPointer(2, TexCoordPointerType.Float, stride, p);
p += Vector2.SizeInBytes;
}
if (scene.HasColors())
{
GL.ColorPointer(3, ColorPointerType.Float, stride, p);
p += Vector3.SizeInBytes;
}
if (scene.HasNormals())
{
GL.NormalPointer(NormalPointerType.Float, stride, p);
p += Vector3.SizeInBytes;
}
GL.VertexPointer(3, VertexPointerType.Float, stride, p);
// Index buffer.
GL.BindBuffer(BufferTarget.ElementArrayBuffer, VBOid[1]);
// Engage!
if (scene.Triangles > 0)
{
GL.DrawElements(PrimitiveType.Triangles, scene.Triangles * 3, DrawElementsType.UnsignedInt, IntPtr.Zero);
}
else
{
GL.DrawElements(PrimitiveType.Lines, scene.Lines * 2, DrawElementsType.UnsignedInt, IntPtr.Zero);
}
GlInfo.LogError("draw-elements-ffp");
if (useTexture)
{
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.Disable(EnableCap.Texture2D);
}
}
triangleCounter += scene.Triangles + scene.Lines;
}
else // color cube
{
SetVertexPointer(false);
SetVertexAttrib(false);
GL.Begin(PrimitiveType.Quads);
GL.Color3(0.0f, 1.0f, 0.0f); // Set The Color To Green
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Top)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
GL.Vertex3(1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
GL.Color3(1.0f, 0.5f, 0.0f); // Set The Color To Orange
GL.Vertex3(1.0f, -1.0f, 1.0f); // Top Right Of The Quad (Bottom)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Top Left Of The Quad (Bottom)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Bottom)
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Bottom)
GL.Color3(1.0f, 0.0f, 0.0f); // Set The Color To Red
GL.Vertex3(1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Front)
GL.Vertex3(1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Front)
GL.Color3(1.0f, 1.0f, 0.0f); // Set The Color To Yellow
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Back)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Back)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Back)
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Back)
GL.Color3(0.0f, 0.0f, 1.0f); // Set The Color To Blue
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Left)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Left)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Left)
GL.Color3(1.0f, 0.0f, 1.0f); // Set The Color To Violet
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Right)
GL.Vertex3(1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
GL.Vertex3(1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Right)
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Right)
GL.End();
triangleCounter += 12;
}
// Support: axes.
if (checkAxes.Checked)
{
float origWidth = GL.GetFloat(GetPName.LineWidth);
float origPoint = GL.GetFloat(GetPName.PointSize);
// Axes.
GL.LineWidth(2.0f);
GL.Begin(PrimitiveType.Lines);
GL.Color3(1.0f, 0.1f, 0.1f);
GL.Vertex3(center);
GL.Vertex3(center + new Vector3(0.5f, 0.0f, 0.0f) * diameter);
GL.Color3(0.0f, 1.0f, 0.0f);
GL.Vertex3(center);
GL.Vertex3(center + new Vector3(0.0f, 0.5f, 0.0f) * diameter);
GL.Color3(0.2f, 0.2f, 1.0f);
GL.Vertex3(center);
GL.Vertex3(center + new Vector3(0.0f, 0.0f, 0.5f) * diameter);
GL.End();
// Support: pointing.
if (pointOrigin != null)
{
GL.Begin(PrimitiveType.Lines);
GL.Color3(1.0f, 1.0f, 0.0f);
GL.Vertex3(pointOrigin.Value);
GL.Vertex3(pointTarget);
GL.Color3(1.0f, 0.0f, 0.0f);
GL.Vertex3(pointOrigin.Value);
GL.Vertex3(eye);
GL.End();
GL.PointSize(4.0f);
GL.Begin(PrimitiveType.Points);
GL.Color3(1.0f, 0.0f, 0.0f);
GL.Vertex3(pointOrigin.Value);
GL.Color3(0.0f, 1.0f, 0.2f);
GL.Vertex3(pointTarget);
GL.Color3(1.0f, 1.0f, 1.0f);
if (spot != null)
{
GL.Vertex3(spot.Value);
}
GL.Vertex3(eye);
GL.End();
}
// Support: frustum.
if (frustumFrame.Count >= 8)
{
GL.LineWidth(2.0f);
GL.Begin(PrimitiveType.Lines);
GL.Color3(1.0f, 0.0f, 0.0f);
GL.Vertex3(frustumFrame[0]);
GL.Vertex3(frustumFrame[1]);
GL.Vertex3(frustumFrame[1]);
GL.Vertex3(frustumFrame[3]);
GL.Vertex3(frustumFrame[3]);
GL.Vertex3(frustumFrame[2]);
GL.Vertex3(frustumFrame[2]);
GL.Vertex3(frustumFrame[0]);
GL.Color3(1.0f, 1.0f, 1.0f);
GL.Vertex3(frustumFrame[0]);
GL.Vertex3(frustumFrame[4]);
GL.Vertex3(frustumFrame[1]);
GL.Vertex3(frustumFrame[5]);
GL.Vertex3(frustumFrame[2]);
GL.Vertex3(frustumFrame[6]);
GL.Vertex3(frustumFrame[3]);
GL.Vertex3(frustumFrame[7]);
GL.Color3(0.0f, 1.0f, 0.0f);
GL.Vertex3(frustumFrame[4]);
GL.Vertex3(frustumFrame[5]);
GL.Vertex3(frustumFrame[5]);
GL.Vertex3(frustumFrame[7]);
GL.Vertex3(frustumFrame[7]);
GL.Vertex3(frustumFrame[6]);
GL.Vertex3(frustumFrame[6]);
GL.Vertex3(frustumFrame[4]);
GL.End();
}
GL.LineWidth(origWidth);
GL.PointSize(origPoint);
}
}
//====================================================================
// Rendering - graph
//====================================================================
/// <summary>
/// Rendering code itself (separated for clarity).
/// </summary>
/// <param name="cam">Camera parameters.</param>
/// <param name="style">Current rendering style.</param>
/// <param name="primitiveCounter">Number of GL primitives rendered.</param>
public void RenderScene(
IDynamicCamera cam,
RenderingStyle style,
ref long primitiveCounter)
{
// Scene rendering.
if (Form1.form.drawGraph &&
VBOlen[0] > 0L &&
activeProgram != null) // buffers are nonempty & shaders are ready => render
{
// Vertex buffer: [texture] [color] [normal] coordinate
GL.BindBuffer(BufferTarget.ArrayBuffer, VBOid[0]);
// GLSL shaders.
activeProgram.EnableVertexAttribArrays();
GL.UseProgram(activeProgram.Id);
// Uniforms.
Matrix4 modelView = cam.ModelView;
Matrix4 projection = cam.Projection;
Vector3 eye = cam.Eye;
GL.UniformMatrix4(activeProgram.GetUniform("matrixModelView"), false, ref modelView);
GL.UniformMatrix4(activeProgram.GetUniform("matrixProjection"), false, ref projection);
GL.Uniform3(activeProgram.GetUniform("globalAmbient"), ref style.globalAmbient);
GL.Uniform3(activeProgram.GetUniform("lightColor"), ref style.whiteLight);
GL.Uniform3(activeProgram.GetUniform("lightPosition"), ref style.lightPosition);
GL.Uniform3(activeProgram.GetUniform("eyePosition"), ref eye);
GL.Uniform3(activeProgram.GetUniform("Ka"), ref style.matAmbient);
GL.Uniform3(activeProgram.GetUniform("Kd"), ref style.matDiffuse);
GL.Uniform3(activeProgram.GetUniform("Ks"), ref style.matSpecular);
GL.Uniform1(activeProgram.GetUniform("shininess"), style.matShininess);
// Color handling.
bool useGlobalColor = style.useGlobalColor;
if (!haveColors) // use global color if vertices haven't got color!
{
useGlobalColor = true;
}
GL.Uniform1(activeProgram.GetUniform("globalColor"), useGlobalColor ? 1 : 0);
// Shading, color interpolation.
// shadingGouraud <=> lighting is computed in VS
// shadingPhong <=> lighting is computed in FS (normal interpolation)
// shadingSmooth <=> colors are interpolated in FS (color interpolation)
bool shadingGouraud = style.lighting && !style.phong;
bool shadingPhong = style.lighting && style.phong;
bool shadingSmooth = style.smooth;
GL.Uniform1(activeProgram.GetUniform("shadingGouraud"), shadingGouraud ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("shadingPhong"), shadingPhong ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("shadingSmooth"), shadingSmooth ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("useAmbient"), style.useAmbient ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("useDiffuse"), style.useDiffuse ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("useSpecular"), style.useSpecular ? 1 : 0);
GlInfo.LogError("set-uniforms");
// Color texture in slot #0.
bool okTexture = style.texture && haveTexture;
GL.Uniform1(activeProgram.GetUniform("useTexture"), okTexture ? 1 : 0);
GL.Uniform1(activeProgram.GetUniform("texSurface"), 0);
if (okTexture)
{
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, texName);
}
GlInfo.LogError("set-texture");
// Vertex attributes.
IntPtr p = IntPtr.Zero;
if (activeProgram.HasAttribute("texCoords"))
{
GL.VertexAttribPointer(activeProgram.GetAttribute("texCoords"), 2, VertexAttribPointerType.Float, false, stride, p);
}
if (haveTexture)
{
p += Vector2.SizeInBytes;
}
if (activeProgram.HasAttribute("color"))
{
GL.VertexAttribPointer(activeProgram.GetAttribute("color"), 3, VertexAttribPointerType.Float, false, stride, p);
}
if (haveColors)
{
p += Vector3.SizeInBytes;
}
if (activeProgram.HasAttribute("normal"))
{
GL.VertexAttribPointer(activeProgram.GetAttribute("normal"), 3, VertexAttribPointerType.Float, false, stride, p);
}
if (haveNormals)
{
p += Vector3.SizeInBytes;
}
GL.VertexAttribPointer(activeProgram.GetAttribute("position"), 3, VertexAttribPointerType.Float, false, stride, p);
GlInfo.LogError("set-attrib-pointers");
// Index buffer.
GL.BindBuffer(BufferTarget.ElementArrayBuffer, VBOid[1]);
// Draw!
// !!!{{ CHANGE THIS PART if you want to add axes, legend, etc...
// Triangle part of the scene.
// Draw total 'vertices' vertices from the beginning of the index-buffer,
// that gives us 'vertices/3' triangles.
GL.DrawElements(PrimitiveType.Triangles, vertices, DrawElementsType.UnsignedInt, IntPtr.Zero);
GlInfo.LogError("draw-elements-shader");
// How to draw lines (e.g. coordinate axes):
//GL.DrawElements(PrimitiveType.Lines, lineVertices, DrawElementsType.UnsignedInt, lineOffset);
// lineVertices ... number of vertex indices for lines (e.g. 'lineVertices/2' lines)
// lineOffset ... start offset in the index-buffer
primitiveCounter += vertices / 3;
// !!!}}
// Cleanup.
GL.UseProgram(0);
if (okTexture)
{
GL.BindTexture(TextureTarget.Texture2D, 0);
}
}
else
{
// Color cube in very old OpenGL style!
GL.Begin(PrimitiveType.Quads);
GL.Color3(0.0f, 1.0f, 0.0f); // Set The Color To Green
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Top)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
GL.Vertex3(1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
GL.Color3(1.0f, 0.5f, 0.0f); // Set The Color To Orange
GL.Vertex3(1.0f, -1.0f, 1.0f); // Top Right Of The Quad (Bottom)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Top Left Of The Quad (Bottom)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Bottom)
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Bottom)
GL.Color3(1.0f, 0.0f, 0.0f); // Set The Color To Red
GL.Vertex3(1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Front)
GL.Vertex3(1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Front)
GL.Color3(1.0f, 1.0f, 0.0f); // Set The Color To Yellow
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Back)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Back)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Back)
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Back)
GL.Color3(0.0f, 0.0f, 1.0f); // Set The Color To Blue
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Left)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Left)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Left)
GL.Color3(1.0f, 0.0f, 1.0f); // Set The Color To Violet
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Right)
GL.Vertex3(1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
GL.Vertex3(1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Right)
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Right)
GL.End();
primitiveCounter += 12;
}
}