RenderCapture: read back from the correct framebuffer

Up until now, RenderCapture would read back from the back buffer. In cases
where it's used within a RenderTargetSelector, it should instead read back
from the ColorAttachment0 of the framebuffer.
Later on we might allow to specify the ColorAttachment.

Change-Id: I9ca94333184338b2fdb79c5c2668d5929ac8d405
Task-number: QTBUG-61547
Reviewed-by: Kevin Ottens <kevin.ottens@kdab.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/src/render/graphicshelpers/graphicshelpergl3_3.cpp b/src/render/graphicshelpers/graphicshelpergl3_3.cpp
index 6959bdc6b..7bbc333f7 100644
--- a/src/render/graphicshelpers/graphicshelpergl3_3.cpp
+++ b/src/render/graphicshelpers/graphicshelpergl3_3.cpp
@@ -347,9 +347,20 @@ void GraphicsHelperGL3_3::releaseFrameBufferObject(GLuint frameBufferId)
     m_funcs->glDeleteFramebuffers(1, &frameBufferId);
 }
 
-void GraphicsHelperGL3_3::bindFrameBufferObject(GLuint frameBufferId)
+void GraphicsHelperGL3_3::bindFrameBufferObject(GLuint frameBufferId, FBOBindMode mode)
 {
-    m_funcs->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frameBufferId);
+    switch (mode) {
+    case FBODraw:
+        m_funcs->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frameBufferId);
+        return;
+    case FBORead:
+        m_funcs->glBindFramebuffer(GL_READ_FRAMEBUFFER, frameBufferId);
+        return;
+    case FBOReadAndDraw:
+    default:
+        m_funcs->glBindFramebuffer(GL_FRAMEBUFFER, frameBufferId);
+        return;
+    }
 }
 
 GLuint GraphicsHelperGL3_3::boundFrameBufferObject()