Horrible debug font bufferification. (Sorry)

[ipdf/code.git] / src / graphicsbuffer.cpp

diff --git a/src/graphicsbuffer.cpp b/src/graphicsbuffer.cpp
index 906226e..6f9ea9a 100644 (file)
--- a/src/graphicsbuffer.cpp
+++ b/src/graphicsbuffer.cpp
@@ -1,12 +1,75 @@
 #include "graphicsbuffer.h"
+#include "log.h"
 #define GL_GLEXT_PROTOTYPES
 #include <SDL_opengl.h>
 #include <GL/glext.h>
 
 using namespace IPDF;
 
+static GLenum BufferUsageToGLUsage(GraphicsBuffer::BufferUsage buffer_usage)
+{
+       GLenum usage;
+       switch (buffer_usage)
+       {
+       case GraphicsBuffer::BufferUsageStaticDraw:
+               usage = GL_STATIC_DRAW;
+               break;
+       case GraphicsBuffer::BufferUsageStaticRead:
+               usage = GL_STATIC_READ;
+               break;
+       case GraphicsBuffer::BufferUsageStaticCopy:
+               usage = GL_STATIC_COPY;
+               break;
+       case GraphicsBuffer::BufferUsageDynamicDraw:
+               usage = GL_DYNAMIC_DRAW;
+               break;
+       case GraphicsBuffer::BufferUsageDynamicRead:
+               usage = GL_DYNAMIC_READ;
+               break;
+       case GraphicsBuffer::BufferUsageDynamicCopy:
+               usage = GL_DYNAMIC_COPY;
+               break;
+       case GraphicsBuffer::BufferUsageStreamDraw:
+               usage = GL_STREAM_DRAW;
+               break;
+       case GraphicsBuffer::BufferUsageStreamRead:
+               usage = GL_STREAM_READ;
+               break;
+       case GraphicsBuffer::BufferUsageStreamCopy:
+               usage = GL_STREAM_COPY;
+               break;
+       default:
+               SDL_assert(false && "Unknown buffer usage type.");
+               usage = GL_DYNAMIC_DRAW;
+       }
+       return usage;
+}
+
+static GLenum BufferTypeToGLType(GraphicsBuffer::BufferType buffer_type)
+{
+       switch (buffer_type)
+       {
+       case GraphicsBuffer::BufferTypeVertex:
+               return GL_ARRAY_BUFFER;
+       case GraphicsBuffer::BufferTypeIndex:
+               return GL_ELEMENT_ARRAY_BUFFER;
+       case GraphicsBuffer::BufferTypePixelPack:
+               return GL_PIXEL_PACK_BUFFER;
+       case GraphicsBuffer::BufferTypePixelUnpack:
+               return GL_PIXEL_UNPACK_BUFFER;
+       case GraphicsBuffer::BufferTypeUniform:
+               return GL_UNIFORM_BUFFER;
+       case GraphicsBuffer::BufferTypeDrawIndirect:
+               return GL_DRAW_INDIRECT_BUFFER;
+       default:
+               return GL_COPY_READ_BUFFER;
+       }
+}
+
 GraphicsBuffer::GraphicsBuffer()
 {
+       m_invalidated = true;
+       m_buffer_size = 0;
        SetUsage(BufferUsageStaticDraw);
 }
 
@@ -33,8 +96,8 @@ void GraphicsBuffer::SetUsage(GraphicsBuffer::BufferUsage bufUsage)
 void* GraphicsBuffer::Map(bool read, bool write, bool invalidate)
 {
        GLbitfield access = ((read)?GL_MAP_READ_BIT:0) | ((write)?GL_MAP_WRITE_BIT:0) | ((invalidate)?GL_MAP_INVALIDATE_BUFFER_BIT:0);
-       GLenum target = (m_buffer_type == GraphicsBuffer::BufferTypeVertex)?GL_ARRAY_BUFFER:GL_ELEMENT_ARRAY_BUFFER;
-       
+       GLenum target = BufferTypeToGLType(m_buffer_type);
+
        Bind();
        
        return glMapBufferRange(target, 0, m_buffer_size, access);
@@ -46,8 +109,8 @@ void* GraphicsBuffer::Map(bool read, bool write, bool invalidate)
 void* GraphicsBuffer::MapRange(int offset, int length, bool read, bool write, bool invalidate)
 {
        GLbitfield access = ((read)?GL_MAP_READ_BIT:0) | ((write)?GL_MAP_WRITE_BIT:0) | ((invalidate)?GL_MAP_INVALIDATE_RANGE_BIT:0);
-       GLenum target = (m_buffer_type == GraphicsBuffer::BufferTypeVertex)?GL_ARRAY_BUFFER:GL_ELEMENT_ARRAY_BUFFER;
-       
+       GLenum target = BufferTypeToGLType(m_buffer_type);
+
        Bind();
        
        return glMapBufferRange(target, offset, length, access);
@@ -58,7 +121,7 @@ void* GraphicsBuffer::MapRange(int offset, int length, bool read, bool write, bo
 
 void GraphicsBuffer::UnMap()
 {
-       GLenum target = (m_buffer_type == GraphicsBuffer::BufferTypeVertex)?GL_ARRAY_BUFFER:GL_ELEMENT_ARRAY_BUFFER;
+       GLenum target = BufferTypeToGLType(m_buffer_type);
        
        Bind();
        glUnmapBuffer(target);
@@ -67,42 +130,9 @@ void GraphicsBuffer::UnMap()
 
 void GraphicsBuffer::Upload(size_t length, const void* data)
 {
-       GLenum target = (m_buffer_type == GraphicsBuffer::BufferTypeVertex)?GL_ARRAY_BUFFER:GL_ELEMENT_ARRAY_BUFFER;
+       GLenum target = BufferTypeToGLType(m_buffer_type);
        
-       GLenum usage;
-       switch (m_buffer_usage)
-       {
-       case BufferUsageStaticDraw:
-               usage = GL_STATIC_DRAW;
-               break;
-       case BufferUsageStaticRead:
-               usage = GL_STATIC_READ;
-               break;
-       case BufferUsageStaticCopy:
-               usage = GL_STATIC_COPY;
-               break;
-       case BufferUsageDynamicDraw:
-               usage = GL_DYNAMIC_DRAW;
-               break;
-       case BufferUsageDynamicRead:
-               usage = GL_DYNAMIC_READ;
-               break;
-       case BufferUsageDynamicCopy:
-               usage = GL_DYNAMIC_COPY;
-               break;
-       case BufferUsageStreamDraw:
-               usage = GL_STREAM_DRAW;
-               break;
-       case BufferUsageStreamRead:
-               usage = GL_STREAM_READ;
-               break;
-       case BufferUsageStreamCopy:
-               usage = GL_STREAM_COPY;
-               break;
-       default:
-               SDL_assert(false && "Unknown buffer usage type.");
-               usage = GL_DYNAMIC_DRAW;
-       }
+       GLenum usage = BufferUsageToGLUsage(m_buffer_usage);
        
        Bind();
        glBufferData(target, length, data, usage);
@@ -112,26 +142,40 @@ void GraphicsBuffer::Upload(size_t length, const void* data)
 
 void GraphicsBuffer::UploadRange(size_t length, intptr_t offset, const void* data)
 {
-       GLenum target = (m_buffer_type == GraphicsBuffer::BufferTypeVertex)?GL_ARRAY_BUFFER:GL_ELEMENT_ARRAY_BUFFER;
+       GLenum target = BufferTypeToGLType(m_buffer_type);
        
        Bind();
        glBufferSubData(target, offset, length, data);
        //glNamedBufferSubDataEXT(m_bufferHandle, offset, length, data);
 }
 
+void GraphicsBuffer::Resize(size_t length)
+{
+       if (m_invalidated)
+       {
+               Upload(length, nullptr);
+       }
+       else
+       {
+               // Create a new buffer and copy the old data into it.
+               UnMap();
+               GLuint old_buffer = m_buffer_handle;    
+               glGenBuffers(1, &m_buffer_handle);
+               Upload(length, nullptr);
+               glBindBuffer(GL_COPY_READ_BUFFER, old_buffer);
+               glBindBuffer(GL_COPY_WRITE_BUFFER, m_buffer_handle);
+               glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0, m_buffer_size);
+               glDeleteBuffers(1, &old_buffer);
+       }
+       m_buffer_size = length;
+
+}
+
 void GraphicsBuffer::Bind()
 {
-       if (m_buffer_type == BufferTypeVertex)
-               glBindBuffer(GL_ARRAY_BUFFER, m_buffer_handle);
-       else if (m_buffer_type == BufferTypeIndex)
-               glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer_handle);
-       else if (m_buffer_type == BufferTypePixelPack)
-               glBindBuffer(GL_PIXEL_PACK_BUFFER, m_buffer_handle);
-       else if (m_buffer_type == BufferTypePixelUnpack)
-               glBindBuffer(GL_PIXEL_UNPACK_BUFFER, m_buffer_handle);
-       else if (m_buffer_type == BufferTypeUniform)
+       if (m_buffer_type == BufferTypeUniform)
                glBindBufferBase(GL_UNIFORM_BUFFER, 0, m_buffer_handle);
-       else if (m_buffer_type == BufferTypeDrawIndirect)
-               glBindBuffer(GL_DRAW_INDIRECT_BUFFER, m_buffer_handle);
+       else
+               glBindBuffer(BufferTypeToGLType(m_buffer_type), m_buffer_handle);
 }