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* GeometryShader.cs: Changed the number of output vertices so that output_vertices * num_varying_components is not larger than MaxGeometryTotalOutputComponents. Moved ProgramParameter calls before LinkProgram.

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This commit is contained in:
the_fiddler 2009-08-25 09:33:01 +00:00
parent 63314b0f82
commit 2695db5b79
1 changed files with 18 additions and 17 deletions
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35
Source/Examples/OpenGL/EXT/GeometryShader.cs
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@ -55,6 +55,7 @@ namespace Examples.Tutorial
"EXT_geometry_shader4 not supported",
System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Exclamation);
Exit();
throw new NotSupportedException();
}
// create a shader object.
@ -126,27 +127,27 @@ namespace Examples.Tutorial
GL.AttachShader(shaderProgram, frag);
GL.AttachShader(shaderProgram, vert);
GL.AttachShader(shaderProgram, geom);
// Set the input type of the primitives we are going to feed the geometry shader, this should be the same as
// the primitive type given to GL.Begin. If the types do not match a GL error will occur (todo: verify GL_INVALID_ENUM, on glBegin)
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryInputTypeExt, (int)BeginMode.Lines);
// Set the output type of the geometry shader. Becasue we input Lines we will output LineStrip(s).
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryOutputTypeExt, (int)BeginMode.LineStrip);
// We must tell the shader program how much vertices the geometry shader will output (at most).
// One simple way is to query the maximum and use that.
// NOTE: Make sure that the number of vertices * sum(components of active varyings) does not
// exceed MaxGeometryTotalOutputComponents.
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryVerticesOutExt, 50);
// NOTE: calls to ProgramParameter do not take effect until you call LinkProgram.
GL.LinkProgram(shaderProgram);
// output link info log.
string info;
GL.GetProgramInfoLog(shaderProgram, out info);
Debug.WriteLine(info);
// Set the input type of the primitives we are going to feed the geometry shader, this should be the same as
// the primitive type given to GL.Begin. If the types do not match a GL error will occur (todo: verify GL_INVALID_ENUM, on glBegin)
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryInputTypeExt, (int)All.Lines);
// Set the output type of the geometry shader. Becasue we input Lines we will output LineStrip(s).
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryOutputTypeExt, (int)All.LineStrip);
// We must tell the shader program how much vertices the geometry shader will output (at most).
// The simple way is to query the maximum and use that.
int tmp;
// Get the maximum amount of vertices into tmp.
GL.GetInteger((GetPName)ExtGeometryShader4.MaxGeometryOutputVerticesExt, out tmp);
// And feed amount that to the shader program. (0x0400 on a HD3850, with catalyst 9.8)
GL.Ext.ProgramParameter(shaderProgram, ExtGeometryShader4.GeometryVerticesOutExt, tmp);
// Set clearcolor and bind the shader program.
GL.ClearColor(0.1f, 0.1f, 0.1f, 0.1f);
GL.UseProgram(shaderProgram);
@ -200,7 +201,7 @@ namespace Examples.Tutorial
/// <param name="e">resize event args</param>
protected override void OnResize(EventArgs e)
{
GL.Viewport(0, 0, Width, Height);
GL.Viewport(ClientRectangle);
// Set projection matrix
GL.MatrixMode(MatrixMode.Projection);
@ -209,8 +210,8 @@ namespace Examples.Tutorial
// Set selector state back to matrix mode
GL.MatrixMode(MatrixMode.Modelview);
base.OnResize(e);
base.OnResize(e);
}
protected override void OnUpdateFrame(FrameEventArgs e)