Fixed GL screen shot.

src/bgfx.cpp

@@ -102,35 +102,51 @@ namespace bgfx
 		_result[15] = 1.0f;
 	}
 
-	void saveTga(const char* _filePath, uint32_t _width, uint32_t _height, uint32_t _pitch, const void* _data)
+	void saveTga(const char* _filePath, uint32_t _width, uint32_t _height, uint32_t _srcPitch, const void* _src, bool _grayscale, bool _yflip)
 	{
 		FILE* file = fopen(_filePath, "wb");
 		if ( NULL != file )
 		{
+			uint8_t type = _grayscale ? 3 : 2;
+			uint8_t bpp = _grayscale ? 8 : 32;
+
 			putc(0, file);
 			putc(0, file);
-			putc(2, file); // uncompressed RGBA
+			putc(type, file);
 			putc(0, file); 
 			putc(0, file);
 			putc(0, file); 
 			putc(0, file);
 			putc(0, file);
 			putc(0, file); 
-			putc(0, file); // x origin
+			putc(0, file);
 			putc(0, file); 
-			putc(0, file); // y origin
-			putc( _width&0xff, file);
+			putc(0, file);
+			putc(_width&0xff, file);
 			putc( (_width>>8)&0xff, file);
-			putc( _height&0xff, file);
+			putc(_height&0xff, file);
 			putc( (_height>>8)&0xff, file);
-			putc(32, file);
+			putc(bpp, file);
 			putc(32, file);
 
-			uint8_t* data = (uint8_t*)_data;
-			for (uint32_t yy = 0; yy < _height; ++yy)
+			uint32_t dstPitch = _width*bpp/8;
+			if (_yflip)
 			{
-				fwrite(data, _width*4, 1, file);
-				data += _pitch;
+				uint8_t* data = (uint8_t*)_src + dstPitch*_height - _srcPitch;
+				for (uint32_t yy = 0; yy < _height; ++yy)
+				{
+					fwrite(data, dstPitch, 1, file);
+					data -= _srcPitch;
+				}
+			}
+			else
+			{
+				uint8_t* data = (uint8_t*)_src;
+				for (uint32_t yy = 0; yy < _height; ++yy)
+				{
+					fwrite(data, dstPitch, 1, file);
+					data += _srcPitch;
+				}
 			}
 
 			fclose(file);

src/bgfx_p.h

@@ -122,7 +122,7 @@ namespace bgfx
 
 	void fatal(bgfx::Fatal::Enum _code, const char* _format, ...);
 	void release(Memory* _mem);
-	void saveTga(const char* _filePath, uint32_t _width, uint32_t _height, uint32_t _pitch, const void* _data);
+	void saveTga(const char* _filePath, uint32_t _width, uint32_t _height, uint32_t _srcPitch, const void* _src, bool _grayscale = false, bool _yflip = false);
 	const char* getAttribName(Attrib::Enum _attr);
 	bool renderFrame();
 

src/renderer_gl.cpp

@@ -388,7 +388,17 @@ namespace bgfx
 #if BGFX_CONFIG_RENDERER_OPENGL
 			void* data = g_realloc(NULL, m_resolution.m_width*m_resolution.m_height*4);
 			glReadPixels(0, 0, m_resolution.m_width, m_resolution.m_height, GL_RGBA, GL_UNSIGNED_BYTE, data);
-			saveTga( (const char*)_mem->data, m_resolution.m_width, m_resolution.m_height, m_resolution.m_width*4, data);
+
+			uint8_t* rgba = (uint8_t*)data;
+			for (uint32_t ii = 0, num = m_resolution.m_width*m_resolution.m_height; ii < num; ++ii)
+			{
+				uint8_t temp = rgba[0];
+				rgba[0] = rgba[2];
+				rgba[2] = temp;
+				rgba += 4;
+			}
+
+			saveTga( (const char*)_mem->data, m_resolution.m_width, m_resolution.m_height, m_resolution.m_width*4, data, false, true);
 			g_free(data);
 #endif // BGFX_CONFIG_RENDERER_OPENGL
 		}