1 files changed, 105 insertions, 0 deletions
diff --git a/Runtime/GfxDevice/GLESCommon.h b/Runtime/GfxDevice/GLESCommon.h
new file mode 100644
index 0000000..9d1ffee
--- /dev/null
+++ b/Runtime/GfxDevice/GLESCommon.h
@@ -0,0 +1,105 @@
+#ifndef GLES_COMMON_H
+#define GLES_COMMON_H
+
+// internal header
+// common gles 1.x/2.x stuff
+// also some common android/ios stuff
+
+#include <ctype.h>
+
+inline int GLES_EstimateVRAM_MB(int total_mem_mb)
+{
+#if UNITY_IPHONE
+	// For iOS we estimate 1/4 of POT(total_mem)
+	const int physical_mem_mb = 1 << (32 - __builtin_clz(total_mem_mb - 1));
+	return physical_mem_mb >> 2;
+#elif UNITY_ANDROID || UNITY_BB10 || UNITY_TIZEN
+	// There is (afawk) no way to determine the size of the VRAM
+    // So we try to create ('fake') a value that is somewhere along the lines of possibly correct.
+    // We make two assumption here:
+    // 1) The VRAM is cut-out from the physical memory range and 2) VRAM size is never bigger than
+    // a 1/4  of the physical memory size, but still bigger than a 1/16 of the total memory size.
+    // Even if not correct it should give an indication of how much memory is available for GPU resources.
+    const int physical_mem_mb = 1 << (32 - __builtin_clz(total_mem_mb - 1));
+    return std::max(  std::min(physical_mem_mb - total_mem_mb, (physical_mem_mb >> 2)),  (total_mem_mb >> 4) );
+#else
+    return 256;
+#endif
+}
+
+namespace systeminfo { int GetPhysicalMemoryMB(); }
+struct GraphicsCaps;
+
+inline void GLES_InitCommonCaps(GraphicsCaps* caps)
+{
+    {
+        caps->vendorID   = 0;
+        caps->rendererID = 0;
+
+        #define GRAB_STRING(target, name)                           \
+        do {                                                        \
+            const char* _tmp_str = (const char*)glGetString(name);  \
+            GLESAssert();                                           \
+            caps->target = _tmp_str ? _tmp_str : "<unknown>";       \
+        } while(0)                                                  \
+
+        GRAB_STRING(rendererString, GL_RENDERER);
+        GRAB_STRING(vendorString, GL_VENDOR);
+        GRAB_STRING(driverVersionString, GL_VERSION);
+
+        #undef GRAB_STRING
+
+        // Distill
+        //    driverVersionString = "OpenGL ES 2.0 build 1.8@905891"
+        // into
+        //    driverLibraryString = "build 1.8@905891"
+        //
+        // See http://www.khronos.org/opengles/sdk/1.1/docs/man/glGetString.xml
+        //
+        const char OpenGL[] = "OpenGL";
+        const char ES[] = "ES";
+        const char* gl_version = caps->driverVersionString.c_str();
+        for (int i = 0 ; i < 3; ++i, ++gl_version)
+        {
+            if(    (i == 0 && strncmp(gl_version, OpenGL, sizeof(OpenGL)-1))
+                || (i == 1 && strncmp(gl_version, ES, sizeof(ES)-1))
+                || (i == 2 && !isdigit(*gl_version))
+              )
+            {
+                gl_version = NULL;
+                break;
+            }
+            if ( !(gl_version = strstr(gl_version, " ")) )
+                break;
+        }
+
+        if (gl_version)
+            caps->driverLibraryString = gl_version;
+        else
+            caps->driverLibraryString = "n/a";
+
+        caps->fixedVersionString  = caps->driverVersionString;
+
+        const char* ext = (const char*)glGetString(GL_EXTENSIONS);
+        GLESAssert();
+
+        ::printf_console ("Renderer: %s\n", caps->rendererString.c_str());
+        ::printf_console ("Vendor:   %s\n", caps->vendorString.c_str());
+        ::printf_console ("Version:  %s\n", caps->driverVersionString.c_str());
+
+        if(ext) DebugTextLineByLine(ext);
+        else    ::printf_console("glGetString(GL_EXTENSIONS) - failure");
+    }
+
+    {
+    #if UNITY_ANDROID || UNITY_IPHONE || UNITY_BB10 || UNITY_TIZEN
+        caps->videoMemoryMB = GLES_EstimateVRAM_MB(systeminfo::GetPhysicalMemoryMB());
+    #else
+        caps->videoMemoryMB = 256; // awesome estimation
+    #endif
+    }
+}
+
+
+#endif // GLES_COMMON_H
+