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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLRenderUtilities.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtk_glew.h"
#include "vtkOpenGLRenderUtilities.h"
#include "vtkNew.h"
#include "vtkOpenGLBufferObject.h"
#include "vtkOpenGLVertexArrayObject.h"
#include "vtkShaderProgram.h"
// ----------------------------------------------------------------------------
vtkOpenGLRenderUtilities::vtkOpenGLRenderUtilities()
{
}
// ----------------------------------------------------------------------------
vtkOpenGLRenderUtilities::~vtkOpenGLRenderUtilities()
{
}
void vtkOpenGLRenderUtilities::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
// ---------------------------------------------------------------------------
// a program must be bound
// a VAO must be bound
void vtkOpenGLRenderUtilities::RenderQuad(
float *verts,
float *tcoords,
vtkShaderProgram *program, vtkOpenGLVertexArrayObject *vao)
{
GLuint iboData[] = {0, 1, 2, 0, 2, 3};
vtkOpenGLRenderUtilities::RenderTriangles(verts, 4,
iboData, 6,
tcoords,
program, vao);
}
// ---------------------------------------------------------------------------
// a program must be bound
// a VAO must be bound
void vtkOpenGLRenderUtilities::RenderTriangles(
float *verts, unsigned int numVerts,
GLuint *iboData, unsigned int numIndices,
float *tcoords,
vtkShaderProgram *program, vtkOpenGLVertexArrayObject *vao)
{
if (!program || !vao || !verts)
{
vtkGenericWarningMacro(<< "Error must have verts, program and vao");
return;
}
if (!program->isBound())
{
vtkGenericWarningMacro("attempt to render to unbound program");
}
vtkNew<vtkOpenGLBufferObject> vbo;
vbo->Upload(verts, numVerts*3, vtkOpenGLBufferObject::ArrayBuffer);
vao->Bind();
if (!vao->AddAttributeArray(program, vbo.Get(), "vertexMC", 0,
sizeof(float)*3, VTK_FLOAT, 3, false))
{
vtkGenericWarningMacro(<< "Error setting 'vertexMC' in shader VAO.");
}
vtkNew<vtkOpenGLBufferObject> tvbo;
if (tcoords)
{
tvbo->Upload(tcoords, numVerts*2, vtkOpenGLBufferObject::ArrayBuffer);
if (!vao->AddAttributeArray(program, tvbo.Get(), "tcoordMC", 0,
sizeof(float)*2, VTK_FLOAT, 2, false))
{
vtkGenericWarningMacro(<< "Error setting 'tcoordMC' in shader VAO.");
}
}
vtkNew<vtkOpenGLBufferObject> ibo;
vao->Bind();
ibo->Upload(iboData, numIndices, vtkOpenGLBufferObject::ElementArrayBuffer);
glDrawElements(GL_TRIANGLES, numIndices, GL_UNSIGNED_INT,
reinterpret_cast<const GLvoid *>(NULL));
ibo->Release();
ibo->ReleaseGraphicsResources();
vao->RemoveAttributeArray("vertexMC");
vao->RemoveAttributeArray("tcoordMC");
vao->Release();
vbo->Release();
vbo->ReleaseGraphicsResources();
if (tcoords)
{
tvbo->Release();
tvbo->ReleaseGraphicsResources();
}
}
//------------------------------------------------------------------------------
std::string vtkOpenGLRenderUtilities::GetFullScreenQuadVertexShader()
{
// Pass through:
return "//VTK::System::Dec\n"
"attribute vec4 ndCoordIn;\n"
"attribute vec2 texCoordIn;\n"
"varying vec2 texCoord;\n"
"void main()\n"
"{\n"
" gl_Position = ndCoordIn;\n"
" texCoord = texCoordIn;\n"
"}\n";
}
//------------------------------------------------------------------------------
std::string vtkOpenGLRenderUtilities::GetFullScreenQuadFragmentShaderTemplate()
{
return "//VTK::System::Dec\n"
"//VTK::Output::Dec\n"
"in vec2 texCoord;\n"
"//VTK::FSQ::Decl\n"
"void main()\n"
"{\n"
"//VTK::FSQ::Impl\n"
"}\n";
}
//------------------------------------------------------------------------------
std::string vtkOpenGLRenderUtilities::GetFullScreenQuadGeometryShader()
{
return "";
}
//------------------------------------------------------------------------------
bool vtkOpenGLRenderUtilities::PrepFullScreenVAO(vtkOpenGLBufferObject *vertBuf,
vtkOpenGLVertexArrayObject *vao,
vtkShaderProgram *prog)
{
bool res;
// ndCoord_x, ndCoord_y, texCoord_x, texCoord_y
float verts[16] = { 1.f, 1.f, 1.f, 1.f,
-1.f, 1.f, 0.f, 1.f,
1.f,-1.f, 1.f, 0.f,
-1.f,-1.f, 0.f, 0.f };
vertBuf->SetType(vtkOpenGLBufferObject::ArrayBuffer);
res = vertBuf->Upload(verts, 16, vtkOpenGLBufferObject::ArrayBuffer);
if (!res)
{
vtkGenericWarningMacro("Error uploading fullscreen quad vertex data.");
return false;
}
vao->Bind();
res = vao->AddAttributeArray(prog, vertBuf, "ndCoordIn", 0, 4 * sizeof(float),
VTK_FLOAT, 2, false);
if (!res)
{
vao->Release();
vtkGenericWarningMacro("Error binding ndCoords to VAO.");
return false;
}
res = vao->AddAttributeArray(prog, vertBuf, "texCoordIn", 2 * sizeof(float),
4 * sizeof(float), VTK_FLOAT, 2, false);
if (!res)
{
vao->Release();
vtkGenericWarningMacro("Error binding texCoords to VAO.");
return false;
}
vao->Release();
return true;
}
//------------------------------------------------------------------------------
void vtkOpenGLRenderUtilities::DrawFullScreenQuad()
{
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
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