File 0002-Use-GL_DRAW_BUFFER0-instead-of-GL_DRAW_BUFFER-for-GL.patch of Package vtk
From 651b3bae914b9f3c69031c97a366e5cf53ead389 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Thu, 16 Jul 2020 19:54:38 +0200
Subject: [PATCH 2/2] Use GL_DRAW_BUFFER0 instead of GL_DRAW_BUFFER for GLES
compatibility
ARB_draw_buffers is part of GL 2.0, so GL_DRAW_BUFFERS0 so it is always
available, and contrary to GL_DRAW_BUFFER it is also valid for GLES
(part of GLES 3 or as EXT_draw_buffers).
This also matches the universal use of glDrawBuffers instead of
glDrawBuffer.
At least with MESA, GL_DRAW_BUFFER and GL_DRAW_BUFFER0 always return the
same value. GL_DRAW_BUFFERn is also used in several places already.
---
.../ContextOpenGL2/vtkOpenGLContextBufferId.cxx | 2 +-
.../vtkOpenGLContextDevice2DPrivate.h | 2 +-
.../External/vtkExternalOpenGLRenderWindow.cxx | 2 +-
Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx | 12 ++++++------
Rendering/OpenGL2/vtkOpenGLState.cxx | 16 ++++++++--------
5 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/Rendering/ContextOpenGL2/vtkOpenGLContextBufferId.cxx b/Rendering/ContextOpenGL2/vtkOpenGLContextBufferId.cxx
index 06abb5e7e6..0d39638869 100644
--- a/Rendering/ContextOpenGL2/vtkOpenGLContextBufferId.cxx
+++ b/Rendering/ContextOpenGL2/vtkOpenGLContextBufferId.cxx
@@ -139,7 +139,7 @@ vtkIdType vtkOpenGLContextBufferId::GetPickedItem(int x, int y)
// Render texture to current write buffer. Texel x,y is rendered at
// pixel x,y (instead of pixel 0,0 to work around pixel ownership test).
GLint savedDrawBuffer;
- glGetIntegerv(GL_DRAW_BUFFER, &savedDrawBuffer);
+ glGetIntegerv(GL_DRAW_BUFFER0, &savedDrawBuffer);
vtkOpenGLState::ScopedglEnableDisable dsaver(ostate, GL_DEPTH_TEST);
vtkOpenGLState::ScopedglEnableDisable ssaver(ostate, GL_STENCIL_TEST);
diff --git a/Rendering/ContextOpenGL2/vtkOpenGLContextDevice2DPrivate.h b/Rendering/ContextOpenGL2/vtkOpenGLContextDevice2DPrivate.h
index 5632547459..17e2f182ef 100644
--- a/Rendering/ContextOpenGL2/vtkOpenGLContextDevice2DPrivate.h
+++ b/Rendering/ContextOpenGL2/vtkOpenGLContextDevice2DPrivate.h
@@ -309,7 +309,7 @@ public:
this->SavedStencilTest = ostate->GetEnumState(GL_STENCIL_TEST);
this->SavedBlend = ostate->GetEnumState(GL_BLEND);
ostate->vtkglGetFloatv(GL_COLOR_CLEAR_VALUE, this->SavedClearColor);
- ostate->vtkglGetIntegerv(GL_DRAW_BUFFER, &this->SavedDrawBuffer);
+ ostate->vtkglGetIntegerv(GL_DRAW_BUFFER0, &this->SavedDrawBuffer);
}
}
diff --git a/Rendering/External/vtkExternalOpenGLRenderWindow.cxx b/Rendering/External/vtkExternalOpenGLRenderWindow.cxx
index c95b50ac64..291c4e1e61 100644
--- a/Rendering/External/vtkExternalOpenGLRenderWindow.cxx
+++ b/Rendering/External/vtkExternalOpenGLRenderWindow.cxx
@@ -60,7 +60,7 @@ void vtkExternalOpenGLRenderWindow::Start(void)
// For stereo, render the correct eye based on the OpenGL buffer mode
GLint bufferType;
- ostate->vtkglGetIntegerv(GL_DRAW_BUFFER, &bufferType);
+ ostate->vtkglGetIntegerv(GL_DRAW_BUFFER0, &bufferType);
vtkCollectionSimpleIterator sit;
vtkRenderer* renderer;
for (this->GetRenderers()->InitTraversal(sit);
diff --git a/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx b/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx
index 4bda9330b6..14cd43711f 100644
--- a/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx
+++ b/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx
@@ -533,8 +533,8 @@ bool vtkOpenGLRenderWindow::InitializeFromCurrentContext()
{
this->DefaultFrameBufferId = frameBufferBinding;
GLint attachment = GL_COLOR_ATTACHMENT0;
-#ifdef GL_DRAW_BUFFER
- glGetIntegerv(GL_DRAW_BUFFER, &attachment);
+#ifdef GL_DRAW_BUFFER0
+ glGetIntegerv(GL_DRAW_BUFFER0, &attachment);
#endif
this->BackLeftBuffer = static_cast<unsigned int>(attachment);
this->FrontLeftBuffer = static_cast<unsigned int>(attachment);
@@ -660,8 +660,8 @@ bool vtkOpenGLRenderWindow::GetUsingSRGBColorSpace()
this->MakeCurrent();
GLint attachment = GL_BACK_LEFT;
-#ifdef GL_DRAW_BUFFER
- glGetIntegerv(GL_DRAW_BUFFER, &attachment);
+#ifdef GL_DRAW_BUFFER0
+ glGetIntegerv(GL_DRAW_BUFFER0, &attachment);
#endif
// GL seems odd with its handling of left/right.
// if it says we are using GL_FRONT or GL_BACK
@@ -716,8 +716,8 @@ int vtkOpenGLRenderWindow::GetColorBufferSizes(int* rgba)
{
this->MakeCurrent();
GLint attachment = GL_BACK_LEFT;
-#ifdef GL_DRAW_BUFFER
- glGetIntegerv(GL_DRAW_BUFFER, &attachment);
+#ifdef GL_DRAW_BUFFER0
+ glGetIntegerv(GL_DRAW_BUFFER0, &attachment);
#endif
#ifdef GL_ES_VERSION_3_0
// GLES only has the GL_BACK color
diff --git a/Rendering/OpenGL2/vtkOpenGLState.cxx b/Rendering/OpenGL2/vtkOpenGLState.cxx
index 3822fe7bd0..dbec8329dd 100644
--- a/Rendering/OpenGL2/vtkOpenGLState.cxx
+++ b/Rendering/OpenGL2/vtkOpenGLState.cxx
@@ -205,8 +205,8 @@ void vtkOpenGLState::CheckState()
error = true;
}
unsigned int sval;
-#ifdef GL_DRAW_BUFFER
- ::glGetIntegerv(GL_DRAW_BUFFER, iparams);
+#ifdef GL_DRAW_BUFFER0
+ ::glGetIntegerv(GL_DRAW_BUFFER0, iparams);
sval = this->CurrentState.DrawBinding.GetDrawBuffer(0);
if (sval == GL_BACK_LEFT)
{
@@ -518,8 +518,8 @@ void vtkOpenGLState::vtkglBindFramebuffer(unsigned int target, unsigned int val)
this->CurrentState.DrawBinding.Binding = val;
this->CurrentState.DrawBinding.Framebuffer = nullptr;
::glBindFramebuffer(GL_DRAW_FRAMEBUFFER, val);
-#ifdef GL_DRAW_BUFFER
- ::glGetIntegerv(GL_DRAW_BUFFER, (int*)&this->CurrentState.DrawBinding.DrawBuffers[0]);
+#ifdef GL_DRAW_BUFFER0
+ ::glGetIntegerv(GL_DRAW_BUFFER0, (int*)&this->CurrentState.DrawBinding.DrawBuffers[0]);
#endif
}
}
@@ -1222,8 +1222,8 @@ void vtkOpenGLState::Initialize(vtkOpenGLRenderWindow*)
unsigned int vals[1];
vals[0] = this->CurrentState.DrawBinding.GetDrawBuffer(0);
::glDrawBuffers(1, vals);
-#ifdef GL_DRAW_BUFFER
- ::glGetIntegerv(GL_DRAW_BUFFER, (int*)&this->CurrentState.DrawBinding.DrawBuffers[0]);
+#ifdef GL_DRAW_BUFFER0
+ ::glGetIntegerv(GL_DRAW_BUFFER0, (int*)&this->CurrentState.DrawBinding.DrawBuffers[0]);
#endif
::glReadBuffer(this->CurrentState.ReadBinding.GetReadBuffer());
::glGetIntegerv(GL_READ_BUFFER, (int*)&this->CurrentState.ReadBinding.ReadBuffer);
@@ -1232,8 +1232,8 @@ void vtkOpenGLState::Initialize(vtkOpenGLRenderWindow*)
void vtkOpenGLState::ResetFramebufferBindings()
{
::glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (int*)&this->CurrentState.DrawBinding.Binding);
-#ifdef GL_DRAW_BUFFER
- ::glGetIntegerv(GL_DRAW_BUFFER, (int*)&this->CurrentState.DrawBinding.DrawBuffers[0]);
+#ifdef GL_DRAW_BUFFER0
+ ::glGetIntegerv(GL_DRAW_BUFFER0, (int*)&this->CurrentState.DrawBinding.DrawBuffers[0]);
#endif
::glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, (int*)&this->CurrentState.ReadBinding.Binding);
--
2.27.0
