1 files changed, 71 insertions, 5 deletions

diff --git a/src/engine/client/backend_sdl.cpp b/src/engine/client/backend_sdl.cpp
index d99f765b..6fa6de01 100644
--- a/src/engine/client/backend_sdl.cpp
+++ b/src/engine/client/backend_sdl.cpp
@@ -100,6 +100,41 @@ int CCommandProcessorFragment_OpenGL::TexFormatToOpenGLFormat(int TexFormat)
 	return GL_RGBA;
 }
 
+unsigned char CCommandProcessorFragment_OpenGL::Sample(int w, int h, const unsigned char *pData, int u, int v, int Offset, int ScaleW, int ScaleH, int Bpp)
+{
+	int Value = 0;
+	for(int x = 0; x < ScaleW; x++)
+		for(int y = 0; y < ScaleH; y++)
+			Value += pData[((v+y)*w+(u+x))*Bpp+Offset];
+	return Value/(ScaleW*ScaleH);
+}
+
+void *CCommandProcessorFragment_OpenGL::Rescale(int Width, int Height, int NewWidth, int NewHeight, int Format, const unsigned char *pData)
+{
+	unsigned char *pTmpData;
+	int ScaleW = Width/NewWidth;
+	int ScaleH = Height/NewHeight;
+
+	int Bpp = 3;
+	if(Format == CCommandBuffer::TEXFORMAT_RGBA)
+		Bpp = 4;
+
+	pTmpData = (unsigned char *)mem_alloc(NewWidth*NewHeight*Bpp, 1);
+
+	int c = 0;
+	for(int y = 0; y < NewHeight; y++)
+		for(int x = 0; x < NewWidth; x++, c++)
+		{
+			pTmpData[c*Bpp] = Sample(Width, Height, pData, x*ScaleW, y*ScaleH, 0, ScaleW, ScaleH, Bpp);
+			pTmpData[c*Bpp+1] = Sample(Width, Height, pData, x*ScaleW, y*ScaleH, 1, ScaleW, ScaleH, Bpp);
+			pTmpData[c*Bpp+2] = Sample(Width, Height, pData, x*ScaleW, y*ScaleH, 2, ScaleW, ScaleH, Bpp);
+			if(Bpp == 4)
+				pTmpData[c*Bpp+3] = Sample(Width, Height, pData, x*ScaleW, y*ScaleH, 3, ScaleW, ScaleH, Bpp);
+		}
+
+	return pTmpData;
+}
+
 void CCommandProcessorFragment_OpenGL::SetState(const CCommandBuffer::SState &State)
 {
 	// blend
@@ -179,6 +214,39 @@ void CCommandProcessorFragment_OpenGL::Cmd_Texture_Destroy(const CCommandBuffer:
 
 void CCommandProcessorFragment_OpenGL::Cmd_Texture_Create(const CCommandBuffer::SCommand_Texture_Create *pCommand)
 {
+	int Width = pCommand->m_Width;
+	int Height = pCommand->m_Height;
+	void *pTexData = pCommand->m_pData;
+
+	// resample if needed
+	if(pCommand->m_Format == CCommandBuffer::TEXFORMAT_RGBA || pCommand->m_Format == CCommandBuffer::TEXFORMAT_RGB)
+	{
+		int MaxTexSize;

+		glGetIntegerv(GL_MAX_TEXTURE_SIZE, &MaxTexSize);
+		if(Width > MaxTexSize || Height > MaxTexSize)
+		{
+			do
+			{
+				Width>>=1;
+				Height>>=1;
+			}
+			while(Width > MaxTexSize || Height > MaxTexSize);
+
+			void *pTmpData = Rescale(pCommand->m_Width, pCommand->m_Height, Width, Height, pCommand->m_Format, static_cast<const unsigned char *>(pCommand->m_pData));
+			mem_free(pTexData);
+			pTexData = pTmpData;
+		}
+		else if(Width > 16 && Height > 16 && (pCommand->m_Flags&CCommandBuffer::TEXFLAG_QUALITY) == 0)
+		{
+			Width>>=1;
+			Height>>=1;
+
+			void *pTmpData = Rescale(pCommand->m_Width, pCommand->m_Height, Width, Height, pCommand->m_Format, static_cast<const unsigned char *>(pCommand->m_pData));
+			mem_free(pTexData);
+			pTexData = pTmpData;
+		}
+	}
+
 	int Oglformat = TexFormatToOpenGLFormat(pCommand->m_Format);
 	int StoreOglformat = TexFormatToOpenGLFormat(pCommand->m_StoreFormat);
 
@@ -199,18 +267,16 @@ void CCommandProcessorFragment_OpenGL::Cmd_Texture_Create(const CCommandBuffer::
 	{
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-		glTexImage2D(GL_TEXTURE_2D, 0, StoreOglformat, pCommand->m_Width, pCommand->m_Height, 0, Oglformat, GL_UNSIGNED_BYTE, pCommand->m_pData);
+		glTexImage2D(GL_TEXTURE_2D, 0, StoreOglformat, Width, Height, 0, Oglformat, GL_UNSIGNED_BYTE, pTexData);
 	}
 	else
 	{
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
-		gluBuild2DMipmaps(GL_TEXTURE_2D, StoreOglformat, pCommand->m_Width, pCommand->m_Height, Oglformat, GL_UNSIGNED_BYTE, pCommand->m_pData);
+		gluBuild2DMipmaps(GL_TEXTURE_2D, StoreOglformat, Width, Height, Oglformat, GL_UNSIGNED_BYTE, pTexData);
 	}
 
 	// calculate memory usage
-	int Width = pCommand->m_Width;
-	int Height = pCommand->m_Height;
 	m_aTextures[pCommand->m_Slot].m_MemSize = Width*Height*pCommand->m_PixelSize;
 	while(Width > 2 && Height > 2)
 	{
@@ -220,7 +286,7 @@ void CCommandProcessorFragment_OpenGL::Cmd_Texture_Create(const CCommandBuffer::
 	}
 	*m_pTextureMemoryUsage += m_aTextures[pCommand->m_Slot].m_MemSize;
 
-	mem_free(pCommand->m_pData);
+	mem_free(pTexData);
 }
 
 void CCommandProcessorFragment_OpenGL::Cmd_Clear(const CCommandBuffer::SCommand_Clear *pCommand)