X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fgraphicsbuffer.cpp;h=c3d9620d36138631f25896053995540bef50268f;hp=844dfe86e9835a6b6238106893bae9b38b90223f;hb=1a234dbfe3aaa80894807d1a9f4a2abeb3ad1411;hpb=80c609660b049d1bf62d98acfb0c1aa893278123

diff --git a/src/graphicsbuffer.cpp b/src/graphicsbuffer.cpp
index 844dfe8..c3d9620 100644
--- a/src/graphicsbuffer.cpp
+++ b/src/graphicsbuffer.cpp
@@ -130,11 +130,13 @@ bool GraphicsBuffer::RecreateBuffer(const void *data)
 	{
 		glDeleteBuffers(1, &m_buffer_handle);
 	}
-	glGenBuffers(1, &m_buffer_handle);
-	glObjectLabel(GL_BUFFER, m_buffer_handle, -1, m_name);
-	m_buffer_shape_dirty = false;
 	if (m_buffer_size)
+	{
+		glGenBuffers(1, &m_buffer_handle);
+		glObjectLabel(GL_BUFFER, m_buffer_handle, -1, m_name);
+		m_buffer_shape_dirty = false;
 		Upload(m_buffer_size, data);
+	}
 	return true;
 }
 
@@ -156,6 +158,10 @@ void* GraphicsBuffer::Map(bool read, bool write, bool invalidate)
 	if (m_map_pointer)
 		Warn("Tried to map already mapped buffer!");	
 
+	// Intel really doesn't seem to like this.
+	if (!m_buffer_size)
+		return (m_map_pointer = 0);
+
 
 	if (!read && m_buffer_usage == BufferUsage::BufferUsageStaticDraw)
 	{
@@ -181,6 +187,10 @@ void* GraphicsBuffer::MapRange(int offset, int length, bool read, bool write, bo
 	if (m_map_pointer)
 		Warn("Tried to map already mapped buffer!");	
 
+	// This sometimes makes Intel corrupt memory?
+	if (!length) return (m_map_pointer = 0);
+
+
 	RecreateBuffer();
 
 	Bind();
@@ -243,10 +253,19 @@ void GraphicsBuffer::UploadRange(size_t length, intptr_t offset, const void* dat
 
 void GraphicsBuffer::Resize(size_t length)
 {
+	if (!m_buffer_size)
+	{
+		m_buffer_size = length;
+		return;
+	}
 	if (m_invalidated && m_buffer_size >= length)
 	{
 		m_buffer_size = length;
 	}
+	else if (length <= m_buffer_size)
+	{
+		// Don't need to do anything.
+	}
 	else
 	{
 		glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "Resizing buffer.");