Make it possible to compile shaders

2 files changed, 63 insertions, 0 deletions

diff --git a/src/library_gl.js b/src/library_gl.js
index a5d73774..ef72112e 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -257,6 +257,50 @@ var LibraryGL = {
     Module.ctx.drawArrays(mode, first, count);
   },
 
+  glCreateShader_deps: ['$GL'],
+  glCreateShader: function(shaderType) {
+    var shader = Module.ctx.createShader(shaderType);
+    return GL.hashtable("shader").add(shader);
+  },
+
+  glShaderSource_deps: ['$GL'],
+  glShaderSource: function(shader, count, string, length) {
+    var source = "";
+    for (var i = 0; i < count; ++i) {
+      var frag = string[i];
+      if (length && IHEAP[length + QUANTUM_SIZE*i]) {
+        var len = IHEAP[length + QUANTUM_SIZE*i];
+        if (len < 0) {
+          frag = Pointer_stringify(IHEAP[string + QUANTUM_SIZE*i]);
+        } else {
+          frag = Pointer_stringify(IHEAP[string + QUANTUM_SIZE*i], len);
+        }
+      } else {
+        frag = Pointer_stringify(IHEAP[string + QUANTUM_SIZE*i]);
+      }
+      if (source.length) {
+        source += "\n";
+      }
+      source += frag;
+    }
+    Module.ctx.shaderSource(GL.hashtable("shader").get(shader), source);
+  },
+
+  glCompileShader_deps: ['$GL'],
+  glCompileShader: function(shader) {
+    Module.ctx.compileShader(GL.hashtable("shader").get(shader));
+  },
+
+  glGetShaderInfoLog_deps: ['$GL'],
+  glGetShaderInfoLog: function(shader, maxLength, length, infoLog) {
+    var log = Module.ctx.getShaderInfoLog(GL.hashtable("shader").get(shader));
+    log.slice(0, maxLength - 1);
+    writeStringToMemory(log, infoLog);
+    if (length) {
+      {{{ makeSetValue('length', 'i', 'log.length', 'i32') }}}
+    }
+  },
+
   glClearColor: function(red, green, blue, alpha) {
     Module.ctx.clearColor(red, green, blue, alpha);
   },
diff --git a/src/preamble.js b/src/preamble.js
index 103b786d..f19a68f1 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -752,6 +752,25 @@ function intArrayToString(array) {
 }
 Module['intArrayToString'] = intArrayToString;
 
+// Write a Javascript array to somewhere in the heap
+function writeStringToMemory(string, buffer, dontAddNull) {
+  var i = 0;
+  while (i < string.length) {
+    var chr = string.charCodeAt(i);
+    if (chr > 0xFF) {
+#if ASSERTIONS
+        assert(false, 'Character code ' + chr + ' (' + string[i] + ')  at offset ' + i + ' not in 0x00-0xFF.');
+#endif
+      chr &= 0xFF;
+    }
+    {{{ makeSetValue('buffer', 'i', 'chr', 'i8') }}}
+    i = i + 1;
+  }
+  if (!dontAddNull) {
+    {{{ makeSetValue('buffer', 'i', '0', 'i8') }}}
+  }
+}
+
 {{{ unSign }}}
 {{{ reSign }}}