X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fgraphicsbuffer.cpp;h=82c6a3098eb1d1b029d8900a44bf758270edb704;hp=fe5ae1c4600d339e5858defaaf2a38c09583328c;hb=ddf7783ce69eb619f5a6b12e779c134279aa2ac6;hpb=eff96d65bd1101083e04cb3ff2468b3feea3ff9e

diff --git a/src/graphicsbuffer.cpp b/src/graphicsbuffer.cpp
index fe5ae1c..82c6a30 100644
--- a/src/graphicsbuffer.cpp
+++ b/src/graphicsbuffer.cpp
@@ -1,8 +1,5 @@
 #include "graphicsbuffer.h"
 #include "log.h"
-#define GL_GLEXT_PROTOTYPES
-#include <SDL_opengl.h>
-#include <GL/glext.h>
 
 using namespace IPDF;
 
@@ -72,6 +69,9 @@ GraphicsBuffer::GraphicsBuffer()
 	m_map_pointer = nullptr;
 	m_buffer_size = 0;
 	m_buffer_shape_dirty = true;
+	m_buffer_handle = 0;
+	m_buffer_usage = BufferUsageDynamicDraw;
+	m_faking_map = false;
 	SetUsage(BufferUsageStaticDraw);
 }
 
@@ -101,18 +101,23 @@ void GraphicsBuffer::SetUsage(GraphicsBuffer::BufferUsage bufUsage)
 void GraphicsBuffer::Invalidate()
 {
 	m_invalidated = true;
+	if (!m_buffer_shape_dirty)
+	{
+		// Orphan the block of memory we're pointing to.
+		Upload(m_buffer_size, nullptr);
+	}
 	// Apparently not supported.
 	//glInvalidateBufferData(m_buffer_handle);
 }
 
-void GraphicsBuffer::RecreateBuffer()
+bool GraphicsBuffer::RecreateBuffer(const void *data)
 {
 	// If the buffer is not dirty, don't recreate it.
-	if (!m_buffer_shape_dirty) return;
+	if (!m_buffer_shape_dirty) return false;
 	// If the buffer is mapped, don't recreate it.
-	if (m_map_pointer) return;
+	if (!m_faking_map && m_map_pointer) return false;
 	// If the buffer has data in it we need, don't recreate it.
-	if (!m_invalidated) return;
+	if (!m_invalidated) return false;
 	if (m_buffer_handle)
 	{
 		glDeleteBuffers(1, &m_buffer_handle);
@@ -120,7 +125,8 @@ void GraphicsBuffer::RecreateBuffer()
 	glGenBuffers(1, &m_buffer_handle);
 	m_buffer_shape_dirty = false;
 	if (m_buffer_size)
-		Upload(m_buffer_size, nullptr);
+		Upload(m_buffer_size, data);
+	return true;
 }
 
 void* GraphicsBuffer::Map(bool read, bool write, bool invalidate)
@@ -129,11 +135,26 @@ void* GraphicsBuffer::Map(bool read, bool write, bool invalidate)
 	GLenum target = BufferTypeToGLType(m_buffer_type);
 
 	if (invalidate)
-	       m_invalidated = true;
+	{
+		m_invalidated = true;
+
+		// Intel's Mesa driver does not rename the buffer when we map with GL_MAP_INVALIDATE_BUFFER_BIT,
+		// resulting in the CPU stalling waiting for rendering from the buffer to complete on the GPU.
+		// We manually force the buffer to be renamed here to avoid this.
+		m_buffer_shape_dirty = true;
+	}
 
 	if (m_map_pointer)
 		Warn("Tried to map already mapped buffer!");	
 
+
+	if (!read && m_buffer_usage == BufferUsage::BufferUsageStaticDraw)
+	{
+		m_map_pointer = malloc(m_buffer_size);
+		m_faking_map = true;
+		return m_map_pointer;
+	}
+
 	RecreateBuffer();
 
 	Bind();
@@ -162,10 +183,21 @@ void* GraphicsBuffer::MapRange(int offset, int length, bool read, bool write, bo
 void GraphicsBuffer::UnMap()
 {
 	GLenum target = BufferTypeToGLType(m_buffer_type);
+
+	if (m_faking_map)
+	{
+		Upload(m_buffer_size, m_map_pointer);
+		free(m_map_pointer);
+		m_map_pointer = nullptr;
+		m_invalidated = false;
+		m_faking_map = false;
+		return;
+	}
 	
 	Bind();
 	glUnmapBuffer(target);
 	m_map_pointer = nullptr;
+	m_invalidated = false;
 }
 
 void GraphicsBuffer::Upload(size_t length, const void* data)
@@ -175,11 +207,14 @@ void GraphicsBuffer::Upload(size_t length, const void* data)
 	GLenum usage = BufferUsageToGLUsage(m_buffer_usage);
 
 	m_invalidated = true;
-	RecreateBuffer();
-	
-	Bind();
-	glBufferData(target, length, data, usage);
 	m_buffer_size = length;
+	if (!RecreateBuffer(data))
+	{
+		Bind();
+		glBufferData(target, length, data, usage);
+	}
+	if (data != nullptr)
+		m_invalidated = false;
 }
 
 void GraphicsBuffer::UploadRange(size_t length, intptr_t offset, const void* data)
@@ -190,6 +225,7 @@ void GraphicsBuffer::UploadRange(size_t length, intptr_t offset, const void* dat
 	
 	Bind();
 	glBufferSubData(target, offset, length, data);
+	m_invalidated = false;
 }
 
 void GraphicsBuffer::Resize(size_t length)
@@ -197,7 +233,6 @@ void GraphicsBuffer::Resize(size_t length)
 	if (m_invalidated)
 	{
 		m_buffer_size = length;
-		RecreateBuffer();	
 	}
 	else
 	{
@@ -214,7 +249,7 @@ void GraphicsBuffer::Resize(size_t length)
 	}
 }
 
-void GraphicsBuffer::Bind()
+void GraphicsBuffer::Bind() const
 {
 	if (m_buffer_type == BufferTypeUniform)
 		glBindBufferBase(GL_UNIFORM_BUFFER, 0, m_buffer_handle);