auto import from //depot/cupcake/@135843

1 files changed, 87 insertions, 0 deletions

diff --git a/opengl/libagl/fp.cpp b/opengl/libagl/fp.cpp
new file mode 100644
index 0000000..ae5f1fe
--- /dev/null
+++ b/opengl/libagl/fp.cpp
@@ -0,0 +1,87 @@
+/* libs/opengles/fp.cpp
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include "fp.h"
+
+// ----------------------------------------------------------------------------
+
+#if !defined(__arm__)
+GGLfixed gglFloatToFixed(float v) {   
+    return GGLfixed(floorf(v * 65536.0f + 0.5f));
+}
+#endif
+
+// ----------------------------------------------------------------------------
+
+namespace android {
+
+namespace gl {
+
+GLfloat fixedToFloat(GLfixed x)
+{
+#if DEBUG_USE_FLOATS
+    return x / 65536.0f;
+#else
+    if (!x) return 0;
+    const uint32_t s = x & 0x80000000;
+    union {
+        uint32_t i;
+        float f;
+    };
+    i = s ? -x : x;
+    const int c = gglClz(i) - 8;
+    i = (c>=0) ? (i<<c) : (i>>-c);
+    const uint32_t e = 134 - c;
+    i &= ~0x800000;
+    i |= e<<23;
+    i |= s;
+    return f;
+#endif
+}
+
+float sinef(float x)
+{
+    const float A =   1.0f / (2.0f*M_PI);
+    const float B = -16.0f;
+    const float C =   8.0f;
+
+    // scale angle for easy argument reduction
+    x *= A;
+    
+    if (fabsf(x) >= 0.5f) {
+        // Argument reduction
+        x = x - ceilf(x + 0.5f) + 1.0f; 
+    }
+
+    const float y = B*x*fabsf(x) + C*x;
+    return 0.2215f * (y*fabsf(y) - y) + y;
+}
+
+float cosinef(float x)
+{
+    return sinef(x + float(M_PI/2));
+}
+
+void sincosf(GLfloat angle, GLfloat* s, GLfloat* c) {
+    *s = sinef(angle);
+    *c = cosinef(angle);
+}
+
+}; // namespace fp_utils
+
+// ----------------------------------------------------------------------------
+}; // namespace android