Add an Android-specific static OpenGL ES 1.1 Java API.
This change adds four new public classes that expose a static OpenGL ES 1.1 API:
android.opengl.GLES10
android.opengl.GLES10Ext
android.opengl.GLES11
android.opengl.GLES11Ext
Benefits:
+ The static API is slightly faster (1% to 4%) than the existing Interface based JSR239 API.
+ The static API is similar to the C API, which should make it easier to import C-based
example code.
+ The static API provides a clear path for adding new OpenGL ES 1.1 extensions
and OpenGL ES 2.0 APIs, neither of which currently have a JSR standard.
Example:
import static android.opengl.GLES10.*;
...
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
Note that it is possible to mix-and-match calls to both the static and JSR239 APIs.
This works because neither API maintains state. They both call through to the same underlying
C OpenGL ES APIs.
Implementation details:
This change enhances the "glgen" "gen" script to generate both the original JSR239 and
new static OpenGL ES APIs. The contents of the generated JSR239 classes remained the same as before,
so there is no need to check in new versions of the generated JSR239 classes.
As part of this work the gen script was updated to be somewhat more robust, and to
work with git instead of perforce. The script prints out commands to git add the generated files,
but leaves it up to the script runner to actually execute those commands.
diff --git a/opengl/tools/glgen/src/GenerateGLES.java b/opengl/tools/glgen/src/GenerateGLES.java
new file mode 100644
index 0000000..60775b7
--- /dev/null
+++ b/opengl/tools/glgen/src/GenerateGLES.java
@@ -0,0 +1,99 @@
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.PrintStream;
+
+public class GenerateGLES {
+
+ static void copy(String filename, PrintStream out) throws IOException {
+ BufferedReader br = new BufferedReader(new FileReader(filename));
+ String s;
+ while ((s = br.readLine()) != null) {
+ out.println(s);
+ }
+ }
+
+ private static void emit(GLESCodeEmitter emitter,
+ BufferedReader specReader,
+ PrintStream glStream,
+ PrintStream cStream) throws Exception {
+ String s = null;
+ while ((s = specReader.readLine()) != null) {
+ if (s.trim().startsWith("//")) {
+ continue;
+ }
+
+ CFunc cfunc = CFunc.parseCFunc(s);
+
+ String fname = cfunc.getName();
+ String stubRoot = "stubs/gles11/" + fname;
+ String javaPath = stubRoot + ".java";
+ File f = new File(javaPath);
+ if (f.exists()) {
+ System.out.println("Special-casing function " + fname);
+ copy(javaPath, glStream);
+ copy(stubRoot + ".cpp", cStream);
+
+ // Register native function names
+ // This should be improved to require fewer discrete files
+ String filename = stubRoot + ".nativeReg";
+ BufferedReader br =
+ new BufferedReader(new FileReader(filename));
+ String nfunc;
+ while ((nfunc = br.readLine()) != null) {
+ emitter.addNativeRegistration(nfunc);
+ }
+ } else {
+ emitter.emitCode(cfunc, s);
+ }
+ }
+ }
+
+ public static void main(String[] args) throws Exception {
+ int aidx = 0;
+ while ((aidx < args.length) && (args[aidx].charAt(0) == '-')) {
+ switch (args[aidx].charAt(1)) {
+ default:
+ System.err.println("Unknown flag: " + args[aidx]);
+ System.exit(1);
+ }
+
+ aidx++;
+ }
+
+ BufferedReader checksReader =
+ new BufferedReader(new FileReader("specs/gles11/checks.spec"));
+ ParameterChecker checker = new ParameterChecker(checksReader);
+
+ // Generate files
+ for(String suffix: new String[] {"GLES10", "GLES10Ext",
+ "GLES11", "GLES11Ext"})
+ {
+ BufferedReader spec11Reader =
+ new BufferedReader(new FileReader("specs/gles11/"
+ + suffix + ".spec"));
+ String gl11Filename = "android/opengl/" + suffix + ".java";
+ String gl11cFilename = "android_opengl_" + suffix + ".cpp";
+ PrintStream gl11Stream =
+ new PrintStream(new FileOutputStream("out/" + gl11Filename));
+ PrintStream gl11cStream =
+ new PrintStream(new FileOutputStream("out/" + gl11cFilename));
+ gl11Stream.println("/*");
+ gl11cStream.println("/*");
+ copy("stubs/gles11/" + suffix + "Header.java-if", gl11Stream);
+ copy("stubs/gles11/" + suffix + "cHeader.cpp", gl11cStream);
+ GLESCodeEmitter emitter = new GLESCodeEmitter(
+ "android/opengl/" + suffix,
+ checker, gl11Stream, gl11cStream);
+ emit(emitter, spec11Reader, gl11Stream, gl11cStream);
+ emitter.emitNativeRegistration("register_android_opengl_jni_"
+ + suffix);
+ gl11Stream.println("}");
+ gl11Stream.close();
+ gl11cStream.close();
+ }
+ }
+}