X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fview.cpp;h=ffcee5676d11358160f43522e33baf4f897a791b;hp=f78ec40e4c5c8d6648d0d9400878420cd8cb2de8;hb=8e97d741cf713296c96b53f4ebb1615e8d443391;hpb=e6c66a8e58f1dda071e6fc4abed39afe49d348f8

diff --git a/src/view.cpp b/src/view.cpp
index f78ec40..ffcee56 100644
--- a/src/view.cpp
+++ b/src/view.cpp
@@ -1,59 +1,341 @@
 #include "view.h"
-
-#include "SDL_opengl.h"
+#include "bufferbuilder.h"
+#include "screen.h"
+#include "gl_core44.h"
 
 using namespace IPDF;
 using namespace std;
 
+/**
+ * Constructs a view
+ * Allocates memory for ObjectRenderers
+ * @param document - The document to associate the View with
+ * @param bounds - Initial bounds of the View
+ * @param colour - Colour to use for rendering this view. TODO: Make sure this actually works, or just remove it
+ */
+View::View(Document & document, Screen & screen, const Rect & bounds, const Colour & colour)
+	: m_use_gpu_transform(USE_GPU_TRANSFORM), m_use_gpu_rendering(USE_GPU_RENDERING), m_bounds_dirty(true), m_buffer_dirty(true), 
+		m_render_dirty(true), m_document(document), m_screen(screen), m_cached_display(), m_bounds(bounds), m_colour(colour), m_bounds_ubo(), 
+		m_objbounds_vbo(), m_object_renderers(NUMBER_OF_OBJECT_TYPES), m_cpu_rendering_pixels(NULL)
+{
+	Debug("View Created - Bounds => {%s}", m_bounds.Str().c_str());
+
+	// Create ObjectRenderers - new's match delete's in View::~View
+	//TODO: Don't forget to put new renderers here or things will be segfaultastic
+	m_object_renderers[RECT_FILLED] = new RectFilledRenderer();
+	m_object_renderers[RECT_OUTLINE] = new RectOutlineRenderer();
+	m_object_renderers[CIRCLE_FILLED] = new CircleFilledRenderer();
+	m_object_renderers[BEZIER] = new BezierRenderer();
+
+	// To add rendering for a new type of object;
+	// 1. Add enum to ObjectType in ipdf.h
+	// 2. Implement class inheriting from ObjectRenderer using that type in objectrenderer.h and objectrenderer.cpp
+	// 3. Add it here
+	// 4. Profit
+
+
+#ifndef QUADTREE_DISABLED
+	m_quadtree_max_depth = 2;
+	m_current_quadtree_node = document.GetQuadTree().root_id;
+#endif
+}
+
+/**
+ * Destroy a view
+ * Frees memory used by ObjectRenderers
+ */
+View::~View()
+{
+	for (unsigned i = 0; i < m_object_renderers.size(); ++i)
+	{
+		delete m_object_renderers[i]; // delete's match new's in constructor
+	}
+	m_object_renderers.clear();
+	delete [] m_cpu_rendering_pixels;
+}
+
+/**
+ * Translate the view
+ * @param x, y - Amount to translate
+ */
 void View::Translate(Real x, Real y)
 {
+	x *= m_bounds.w;
+	y *= m_bounds.h;
 	m_bounds.x += x;
 	m_bounds.y += y;
+	Debug("View Bounds => %s", m_bounds.Str().c_str());
+	if (!m_use_gpu_transform)
+		m_buffer_dirty = true;
+	m_bounds_dirty = true;
+}
+
+/**
+ * Scale the View at a point
+ * @param x, y - Coordinates to scale at (eg: Mouse cursor position)
+ * @param scale_amount - Amount to scale by
+ */
+void View::ScaleAroundPoint(Real x, Real y, Real scale_amount)
+{
+	// x and y are coordinates in the window
+	// Convert to local coords.
+	x *= m_bounds.w;
+	y *= m_bounds.h;
+	x += m_bounds.x;
+	y += m_bounds.y;
+	
+	Real top = y - m_bounds.y;
+	Real left = x - m_bounds.x;
+	
+	top *= scale_amount;
+	left *= scale_amount;
+	
+	m_bounds.x = x - left;
+	m_bounds.y = y - top;
+	m_bounds.w *= scale_amount;
+	m_bounds.h *= scale_amount;
+	//Debug("Scale at {%s, %s} by %s View Bounds => %s", x.Str().c_str(), y.Str().c_str(), scale_amount.Str().c_str(), m_bounds.Str().c_str());
+	if (!m_use_gpu_transform)
+		m_buffer_dirty = true;
+	m_bounds_dirty = true;
 }
 
-void View::Render()
+/**
+ * Transform a point in the document to a point relative to the top left corner of the view
+ * This is the CPU coordinate transform code; used only if the CPU is doing coordinate transforms
+ * @param inp - Input Rect {x,y,w,h} in the document
+ * @returns output Rect {x,y,w,h} in the View
+ */
+Rect View::TransformToViewCoords(const Rect& inp) const
 {
-	static bool debug_output_done = false;
-	if (!debug_output_done)
+	Rect out;
+	out.x = (inp.x - m_bounds.x) / m_bounds.w;
+	out.y = (inp.y - m_bounds.y) / m_bounds.h;
+	out.w = inp.w / m_bounds.w;
+	out.h = inp.h / m_bounds.h;
+	return out;
+}
+
+/**
+ * Render the view
+ * Updates FrameBuffer if the document, object bounds, or view bounds have changed, then Blits it
+ * Otherwise just Blits the cached FrameBuffer
+ * @param width - Width of View to render
+ * @param height - Height of View to render
+ */
+void View::Render(int width, int height)
+{
+	// View dimensions have changed (ie: Window was resized)
+	int prev_width = m_cached_display.GetWidth();
+	int prev_height = m_cached_display.GetHeight();
+	if (width != prev_width || height != prev_height)
+	{
+		m_cached_display.Create(width, height);
+		m_bounds_dirty = true;
+	}
+
+	// View bounds have not changed; blit the FrameBuffer as it is
+	if (!m_bounds_dirty)
+	{
+		m_cached_display.UnBind();
+		m_cached_display.Blit();
+		return;
+	}
+	m_cached_display.Bind(); //NOTE: This is redundant; Clear already calls Bind
+	m_cached_display.Clear();
+
+
+	if (!m_use_gpu_rendering)
+	{
+		// Dynamically resize CPU rendering target pixels if needed
+		if (m_cpu_rendering_pixels == NULL || width*height > prev_width*prev_height)
+		{
+			delete [] m_cpu_rendering_pixels;
+			m_cpu_rendering_pixels = new uint8_t[width*height*4];
+			if (m_cpu_rendering_pixels == NULL)
+				Fatal("Could not allocate %d*%d*4 = %d bytes for cpu rendered pixels", width, height, width*height*4);
+		}
+		// Clear CPU rendering pixels
+		for (int i = 0; i < width*height*4; ++i)
+			m_cpu_rendering_pixels[i] = 255;
+	}
+#ifdef QUADTREE_DISABLED
+	RenderRange(width, height, 0, m_document.ObjectCount());
+#else
+	RenderQuadtreeNode(width, height, m_current_quadtree_node, m_quadtree_max_depth);
+#endif
+	if (!m_use_gpu_rendering)
 	{
-		m_document.DebugDumpObjects();
-		debug_output_done = true;
+		m_screen.RenderPixels(0,0,width, height, m_cpu_rendering_pixels); //TODO: Make this work :(
+		// Debug for great victory (do something similar for GPU and compare?)
+		ObjectRenderer::SaveBMP({m_cpu_rendering_pixels, width, height}, "cpu_rendering_last_frame.bmp");
 	}
+	m_cached_display.UnBind(); // resets render target to the screen
+	m_cached_display.Blit(); // blit FrameBuffer to screen
+}
 
-	glClearColor(1.f,1.f,1.f,1.f);
-	glClear(GL_COLOR_BUFFER_BIT);
+#ifndef QUADTREE_DISABLED
+void View::RenderQuadtreeNode(int width, int height, QuadTreeIndex node, int remaining_depth)
+{
+	Rect old_bounds = m_bounds;
+	if (node == QUADTREE_EMPTY) return;
+	if (!remaining_depth) return;
+	Debug("Rendering QT node %d, (objs: %d -- %d)\n", node, m_document.GetQuadTree().nodes[node].object_begin, m_document.GetQuadTree().nodes[node].object_end);
+	RenderRange(width, height, m_document.GetQuadTree().nodes[node].object_begin, m_document.GetQuadTree().nodes[node].object_end);
 
-	glMatrixMode(GL_PROJECTION);
-	glLoadIdentity();
-	glOrtho(Float(m_bounds.x), Float(m_bounds.x)+Float(m_bounds.w), Float(m_bounds.y) + Float(m_bounds.h), Float(m_bounds.y), -1.f, 1.f);
-	glMatrixMode(GL_MODELVIEW);
-	glLoadIdentity();
+	m_bounds = TransformToQuadChild(old_bounds, QTC_TOP_LEFT);
+	m_bounds_dirty = true;
+	RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].top_left, remaining_depth-1);
+	m_bounds = TransformToQuadChild(old_bounds, QTC_TOP_RIGHT);
+	m_bounds_dirty = true;
+	RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].top_right, remaining_depth-1);
+	m_bounds = TransformToQuadChild(old_bounds, QTC_BOTTOM_LEFT);
+	m_bounds_dirty = true;
+	RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].bottom_left, remaining_depth-1);
+	m_bounds = TransformToQuadChild(old_bounds, QTC_BOTTOM_RIGHT);
+	m_bounds_dirty = true;
+	RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].bottom_right, remaining_depth-1);
+	m_bounds = old_bounds;
+	m_bounds_dirty = true;
+}
+#endif
+
+void View::RenderRange(int width, int height, unsigned first_obj, unsigned last_obj)
+{
+
+	if (m_render_dirty) // document has changed
+		PrepareRender();
+
+	if (m_buffer_dirty || (m_bounds_dirty && !m_use_gpu_transform)) // object bounds have changed
+		UpdateObjBoundsVBO();
+
+	if (m_use_gpu_transform)
+	{
+		GLfloat glbounds[] = {static_cast<GLfloat>(Float(m_bounds.x)), static_cast<GLfloat>(Float(m_bounds.y)), static_cast<GLfloat>(Float(m_bounds.w)), static_cast<GLfloat>(Float(m_bounds.h)),
+					0.0, 0.0, 640.0, 480.0};
+		m_bounds_ubo.Upload(sizeof(float)*8, glbounds);
+	}
+	else
+	{
+		GLfloat glbounds[] = {0.0f, 0.0f, 1.0f, 1.0f,
+					0.0f, 0.0f, 640.0f, 480.0f};
+		m_bounds_ubo.Upload(sizeof(float)*8, glbounds);
+	}
+	m_bounds_dirty = false;
+
+
+	// Render using GPU
+	if (m_use_gpu_rendering) 
+	{
+		if (m_colour.a < 1.0f)
+		{
+			glEnable(GL_BLEND);
+			glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+		}
+		m_objbounds_vbo.Bind();
+		m_bounds_ubo.Bind();
+		glEnableVertexAttribArray(0);
+		glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
+	
+		for (unsigned i = 0; i < m_object_renderers.size(); ++i)
+		{
+			m_object_renderers[i]->RenderUsingGPU(first_obj, last_obj);
+		}
+		
+		glDisableVertexAttribArray(0);
+		if (m_colour.a < 1.0f)
+		{
+			glDisable(GL_BLEND);
+		}
+	}
+	else // Rasterise on CPU then blit texture to GPU
+	{
+
+		for (unsigned i = 0; i < m_object_renderers.size(); ++i)
+		{
+			m_object_renderers[i]->RenderUsingCPU(m_document.m_objects, *this, {m_cpu_rendering_pixels, width, height}, first_obj, last_obj);
+		}
+	}
+}
+
+void View::UpdateObjBoundsVBO()
+{
+	m_objbounds_vbo.Invalidate();
+	m_objbounds_vbo.SetType(GraphicsBuffer::BufferTypeVertex);
+	if (m_use_gpu_transform)
+	{
+		m_objbounds_vbo.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
+	}
+	else
+	{
+		m_objbounds_vbo.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
+	}
+	m_objbounds_vbo.Resize(m_document.ObjectCount()*sizeof(GPUObjBounds));
+
+	BufferBuilder<GPUObjBounds> obj_bounds_builder(m_objbounds_vbo.Map(false, true, true), m_objbounds_vbo.GetSize());
 
-	glColor4f(0.f,0.f,0.f,1.f);
-	glBegin(GL_QUADS);
 	for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
 	{
-		if (m_document.m_objects.types[id] == RECT_FILLED)
-			continue;
-		Rect obj_bounds = m_document.m_objects.bounds[id];
-		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y));
-		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y));
-		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y) + Float(obj_bounds.h));
-		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
+		Rect obj_bounds;
+		if (m_use_gpu_transform)
+		{
+			obj_bounds = m_document.m_objects.bounds[id];
+		}
+		else
+		{
+			obj_bounds = TransformToViewCoords(m_document.m_objects.bounds[id]);
+		}
+		GPUObjBounds gpu_bounds = {
+			(float)Float(obj_bounds.x),
+			(float)Float(obj_bounds.y),
+			(float)Float(obj_bounds.x + obj_bounds.w),
+			(float)Float(obj_bounds.y + obj_bounds.h)
+		};
+		obj_bounds_builder.Add(gpu_bounds);
+
 	}
-	glEnd();
+	m_objbounds_vbo.UnMap();
+	m_buffer_dirty = false;
+}
+/**
+ * Prepare the document for rendering
+ * Will be called on View::Render if m_render_dirty is set
+ * (Called at least once, on the first Render)
+ */
+void View::PrepareRender()
+{
+	Debug("Recreate buffers with %u objects", m_document.ObjectCount());
+	// Prepare bounds vbo
+	m_bounds_ubo.Invalidate();
+	m_bounds_ubo.SetType(GraphicsBuffer::BufferTypeUniform);
+	m_bounds_ubo.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
+	
+	// Instead of having each ObjectRenderer go through the whole document
+	//  we initialise them, go through the document once adding to the appropriate Renderers
+	//  and then finalise them
+	// This will totally be efficient if we have like, a lot of distinct ObjectTypes. Which could totally happen. You never know.
 
+	// Prepare the buffers
+	for (unsigned i = 0; i < m_object_renderers.size(); ++i)
+	{
+		m_object_renderers[i]->PrepareBuffers(m_document.ObjectCount());
+	}
+
+	// Add objects from Document to buffers
 	for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
 	{
-		if (m_document.m_objects.types[id] == RECT_OUTLINE)
-			continue;
-		Rect obj_bounds = m_document.m_objects.bounds[id];
-		glBegin(GL_LINE_LOOP);
-		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y));
-		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y));
-		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y) + Float(obj_bounds.h));
-		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
-		glEnd();
+		ObjectType type = m_document.m_objects.types[id];
+		m_object_renderers.at(type)->AddObjectToBuffers(id); // Use at() in case the document is corrupt TODO: Better error handling?
+		// (Also, Wow I just actually used std::vector::at())
+		// (Also, I just managed to make it throw an exception because I'm a moron)
+		Debug("Object of type %d", type);
 	}
 
+	// Finish the buffers
+	for (unsigned i = 0; i < m_object_renderers.size(); ++i)
+	{
+		m_object_renderers[i]->FinaliseBuffers();
+	}
+	dynamic_cast<BezierRenderer*>(m_object_renderers[BEZIER])->PrepareBezierGPUBuffer(m_document.m_objects);
+	m_render_dirty = false;
 }