Initial commit of current work on Prime World Editor

2025-12-20 10:25:40 +00:00 · 2015-07-26 17:39:49 -04:00
commit 66e8c2ebcb
305 changed files with 33469 additions and 0 deletions
--- a/OpenGL/CDynamicVertexBuffer.cpp
+++ b/OpenGL/CDynamicVertexBuffer.cpp
@@ -0,0 +1,136 @@
+#include "CDynamicVertexBuffer.h"
+#include "CVertexArrayManager.h"
+
+static const u32 gskAttribSize[] = {
+    0xC, 0xC, 0x4, 0x4, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8
+};
+
+CDynamicVertexBuffer::CDynamicVertexBuffer()
+{
+    mAttribFlags = eNoAttributes;
+    mBufferedFlags = eNoAttributes;
+    mNumVertices = 0;
+}
+
+CDynamicVertexBuffer::~CDynamicVertexBuffer()
+{
+    CVertexArrayManager::DeleteAllArraysForVBO(this);
+    ClearBuffers();
+}
+
+void CDynamicVertexBuffer::SetVertexCount(u32 NumVerts)
+{
+    ClearBuffers();
+    mNumVertices = NumVerts;
+    InitBuffers();
+}
+
+void CDynamicVertexBuffer::Bind()
+{
+    CVertexArrayManager::Current()->BindVAO(this);
+}
+
+void CDynamicVertexBuffer::Unbind()
+{
+    glBindVertexArray(0);
+}
+
+void CDynamicVertexBuffer::SetActiveAttribs(u32 AttribFlags)
+{
+    ClearBuffers();
+    mAttribFlags = (EVertexDescription) AttribFlags;
+    InitBuffers();
+}
+
+void CDynamicVertexBuffer::BufferAttrib(EVertexDescription Attrib, const void *pData)
+{
+    u32 Index;
+
+    switch (Attrib)
+    {
+    case ePosition: Index = 0;  break;
+    case eNormal:   Index = 1;  break;
+    case eColor0:   Index = 2;  break;
+    case eColor1:   Index = 3;  break;
+    case eTex0:     Index = 4;  break;
+    case eTex1:     Index = 5;  break;
+    case eTex2:     Index = 6;  break;
+    case eTex3:     Index = 7;  break;
+    case eTex4:     Index = 8;  break;
+    case eTex5:     Index = 9;  break;
+    case eTex6:     Index = 10; break;
+    case eTex7:     Index = 11; break;
+    default: return;
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, mAttribBuffers[Index]);
+    glBufferSubData(GL_ARRAY_BUFFER, 0, gskAttribSize[Index] * mNumVertices, pData);
+}
+
+void CDynamicVertexBuffer::ClearBuffers()
+{
+    for (u32 iAttrib = 0; iAttrib < 12; iAttrib++)
+    {
+        u8 Bit = 1 << iAttrib;
+
+        if (mBufferedFlags & Bit)
+            glDeleteBuffers(1, &mAttribBuffers[iAttrib]);
+    }
+
+    mBufferedFlags = eNoAttributes;
+}
+
+GLuint CDynamicVertexBuffer::CreateVAO()
+{
+    GLuint VertexArray;
+    glGenVertexArrays(1, &VertexArray);
+    glBindVertexArray(VertexArray);
+
+    for (u32 iAttrib = 0; iAttrib < 12; iAttrib++)
+    {
+        bool HasAttrib = ((3 << (iAttrib * 2)) != 0);
+
+        if (HasAttrib)
+        {
+            glBindBuffer(GL_ARRAY_BUFFER, mAttribBuffers[iAttrib]);
+            GLuint NumComponents;
+            GLenum DataType;
+
+            if ((iAttrib == 2) || (iAttrib == 3))
+            {
+                NumComponents = 4;
+                DataType = GL_UNSIGNED_BYTE;
+            }
+            else
+            {
+                NumComponents = gskAttribSize[iAttrib] / 4;
+                DataType = GL_FLOAT;
+            }
+
+            glVertexAttribPointer(iAttrib, NumComponents, DataType, GL_FALSE, 0, (void*) 0);
+            glEnableVertexAttribArray(iAttrib);
+        }
+    }
+
+    glBindVertexArray(0);
+    return VertexArray;
+}
+
+// ************ PRIVATE ************
+void CDynamicVertexBuffer::InitBuffers()
+{
+    if (mBufferedFlags) ClearBuffers();
+
+    for (u32 iAttrib = 0; iAttrib < 12; iAttrib++)
+    {
+        bool HasAttrib = ((3 << (iAttrib * 2)) != 0);
+
+        if (HasAttrib)
+        {
+            glGenBuffers(1, &mAttribBuffers[iAttrib]);
+            glBindBuffer(GL_ARRAY_BUFFER, mAttribBuffers[iAttrib]);
+            glBufferData(GL_ARRAY_BUFFER, gskAttribSize[iAttrib] * mNumVertices, NULL, GL_DYNAMIC_DRAW);
+        }
+    }
+    mBufferedFlags = mAttribFlags;
+}