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* Add display list support.

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While performance still sucks without VBOs, it's like 5x better now
This commit is contained in:
iProgramInCpp 2023-08-13 16:34:23 +03:00
parent f4855d38b6
commit 206bc5cce0
1 changed files with 89 additions and 1 deletions
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90
compat/GLExt.cpp
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@ -122,6 +122,8 @@ void xglSwapIntervalEXT(int interval)
// ** Incomplete software based emulation of OpenGL vertex buffers.
#define USE_DISPLAY_LISTS
struct GLBuffer
{
GLuint m_id;
@ -147,24 +149,72 @@ struct GLBuffer
GLsizei m_col_stride;
GLint m_col_offset;
// associated display list
GLuint m_AssociatedDisplayList; // used if USE_DISPLAY_LISTS is on
GLBuffer(GLuint id)
{
m_id = id;
m_pBufferData = nullptr;
m_bufferSize = 0;
m_usage = 0;
m_AssociatedDisplayList = 0;
}
void DeletePreExistingDLIfNeeded()
{
#ifdef USE_DISPLAY_LISTS
if (m_AssociatedDisplayList != 0)
glDeleteLists(m_AssociatedDisplayList, 1);
m_AssociatedDisplayList = 0;
#endif
}
bool HasDisplayList()
{
#ifndef USE_DISPLAY_LISTS
return false;
#endif
return m_AssociatedDisplayList != 0;
}
GLuint GetDisplayList()
{
return m_AssociatedDisplayList;
}
void SetDisplayList(GLuint dl)
{
m_AssociatedDisplayList = dl;
}
void SetVertexPointer(GLint size, GLenum type, GLsizei stride, const GLvoid* offset)
{
int ioffset = int(size_t(offset));
if (m_vtx_size == size &&
m_vtx_type == type &&
m_vtx_stride == stride &&
m_vtx_offset == ioffset)
return;
DeletePreExistingDLIfNeeded();
m_vtx_size = size;
m_vtx_type = type;
m_vtx_stride = stride;
m_vtx_offset = int(size_t(offset));
m_vtx_offset = ioffset;
}
void SetTextureCoordPointer(GLint size, GLenum type, GLsizei stride, const GLvoid* offset)
{
int ioffset = int(size_t(offset));
if (m_tc_size == size &&
m_tc_type == type &&
m_tc_stride == stride &&
m_tc_offset == ioffset)
return;
DeletePreExistingDLIfNeeded();
m_tc_size = size;
m_tc_type = type;
m_tc_stride = stride;
@ -173,6 +223,14 @@ struct GLBuffer
void SetColorPointer(GLint size, GLenum type, GLsizei stride, const GLvoid* offset)
{
int ioffset = int(size_t(offset));
if (m_col_size == size &&
m_col_type == type &&
m_col_stride == stride &&
m_col_offset == ioffset)
return;
DeletePreExistingDLIfNeeded();
m_col_size = size;
m_col_type = type;
m_col_stride = stride;
@ -248,6 +306,16 @@ void xglBufferData(GLenum target, GLsizeiptr size, const GLvoid* data, GLenum us
GLBuffer* pBuf = g_pCurrentlyBoundGLBuffer;
// check if the data is the SAME:
if (pBuf->m_bufferSize == size && memcmp(pBuf->m_pBufferData, data, size) == 0)
{
//nope
pBuf->m_usage = usage;
return;
}
pBuf->DeletePreExistingDLIfNeeded();
// free the old data, if there was any
if (pBuf->m_pBufferData)
{
@ -271,6 +339,8 @@ void xglDeleteBuffer(GLsizei num)
if (iter->second == g_pCurrentlyBoundGLBuffer)
g_pCurrentlyBoundGLBuffer = nullptr;
iter->second->DeletePreExistingDLIfNeeded();
delete iter->second;
g_GLBuffers.erase(iter);
}
@ -331,6 +401,19 @@ void xglDrawArrays(GLenum mode, GLint first, GLsizei count)
xglAssert(g_pCurrentlyBoundGLBuffer != nullptr);
GLBuffer* pBuf = g_pCurrentlyBoundGLBuffer;
#ifdef USE_DISPLAY_LISTS
if (pBuf->HasDisplayList())
{
glCallList(pBuf->GetDisplayList());
return;
}
GLuint currDL = glGenLists(1);
pBuf->SetDisplayList(currDL);
glNewList(currDL, GL_COMPILE);
#endif
glBegin(mode);
for (GLsizeiptr i = first, j = 0; j < count; i++, j++)
@ -381,6 +464,11 @@ void xglDrawArrays(GLenum mode, GLint first, GLsizei count)
}
glEnd();
#ifdef USE_DISPLAY_LISTS
glEndList();
glCallList(pBuf->GetDisplayList());
#endif
}
#endif