Add inter-process binary shader cache for MeeGo

This patch significantly reduces MeeGo app startup times by caching binary
shaders in a shared memory segment.

Reviewed-by: Robert Griebl
Reviewed-by: Samuel Rødal

2 files changed, 55 insertions, 0 deletions

diff --git a/src/opengl/util/meego/main.cpp b/src/opengl/util/meego/main.cpp
new file mode 100644
index 0000000..0c9a915
--- /dev/null
+++ b/src/opengl/util/meego/main.cpp
@@ -0,0 +1,48 @@
+#include <QtCore/qdebug.h>
+
+#define QT_DEBUG_SHADER_CACHE
+#define QT_MEEGO_EXPERIMENTAL_SHADERCACHE
+#define QT_OPENGL_ES_2
+#define QT_BOOTSTRAPPED
+
+typedef int GLsizei;
+typedef unsigned int GLenum;
+
+#include "../../gl2paintengineex/qglshadercache_meego_p.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int main()
+{
+    ShaderCacheSharedMemory shm;
+
+    if (!shm.isAttached()) {
+        fprintf(stderr, "Unable to attach to shared memory\n");
+        return EXIT_FAILURE;
+    }
+
+    ShaderCacheLocker locker(&shm);
+    if (!locker.isLocked()) {
+        fprintf(stderr, "Unable to lock shared memory\n");
+        return EXIT_FAILURE;
+    }
+
+    void *data = shm.data();
+    Q_ASSERT(data);
+
+    CachedShaders *cache = reinterpret_cast<CachedShaders *>(data);
+
+    for (int i = 0; i < cache->shaderCount; ++i) {
+        printf("Shader %d: %d bytes\n", i, cache->headers[i].size);
+    }
+
+    printf("\nSummary:\n\n"
+           "    Amount of cached shaders: %d\n"
+           "                  Bytes used: %d\n"
+           "             Bytes available: %d\n",
+           cache->shaderCount, cache->dataSize, cache->availableSize());
+
+    return EXIT_SUCCESS;
+}
+
diff --git a/src/opengl/util/meego/shader-cache-introspector.pro b/src/opengl/util/meego/shader-cache-introspector.pro
new file mode 100644
index 0000000..520e9a5
--- /dev/null
+++ b/src/opengl/util/meego/shader-cache-introspector.pro
@@ -0,0 +1,7 @@
+TEMPLATE = app
+
+SOURCES += main.cpp
+
+TARGET = shader-cache-introspector
+
+QT = core