Method DrawHelper

trinity/Tr2Blitter.cpp:101–165

}

bool Tr2Blitter::DrawHelper( Tr2RenderContext& renderContext, Tr2Shader* shader, Tr2Material* material, const Tr2TextureAL* halTexture, bool isCameraSpace, const Vector2& tlTexCoord, const Vector2& brTexCoord, const Vector2& tlVertexCoord, const Vector2& brVertexCoord )
{
	CCP_ASSERT( material );
	if( !material )
	{
		// Final build should not crash even if we get here with a null effect
		return false;
	}

	if( m_screenVertexDecl == -1 || !m_vertexBuffer.IsValid() )
	{
		return false;
	}

	if( !shader )
	{
		return false;
	}

	Tr2ScreenVertex* quad = NULL;
	CR_RETURN_VAL( m_vertexBuffer.MapForWriting( quad, renderContext ), false );

	if( isCameraSpace )
	{
		CCP_ASSERT( tlVertexCoord[0] == 0.0f && tlVertexCoord[1] == 0.0f );
		CCP_ASSERT( brVertexCoord[0] == 1.0f && brVertexCoord[1] == 1.0f );

		SetupScreenQuadInCameraSpace( quad );
	}
	else
	{
		SetupScreenQuad( quad, tlTexCoord, brTexCoord, tlVertexCoord, brVertexCoord );
	}

	m_vertexBuffer.UnmapForWriting( renderContext );

	renderContext.m_esm.ApplyVertexDeclaration( m_screenVertexDecl );
	renderContext.m_esm.ApplyStreamSource( 0, m_vertexBuffer, 0, sizeof( Tr2ScreenVertex ) );

	static CTr2TransientTextureReference textureReference;
	Tr2TextureAL texCopy;
	if( halTexture )
	{
		texCopy = *halTexture;
		textureReference.SetTexture( &texCopy );
		GlobalStore().GetVariable( "BlitSource" )->SetValue( &textureReference );
	}

	unsigned int passCount = shader->GetPassCount( 0 );

	for( unsigned int passIx = 0; passIx < passCount; ++passIx )
	{
		shader->ApplyAllStateForPass( 0, passIx, renderContext );
		material->ApplyMaterialDataForPass( 0, passIx, renderContext );
		{
			renderContext.SetTopology( TOP_TRIANGLE_STRIP );
			renderContext.DrawPrimitive( 0, 2 );
		}