general 32bit generator methods, like OPNMIDI

2 files changed, 32 insertions, 2 deletions

diff --git a/src/chips/opl_chip_base.cpp b/src/chips/opl_chip_base.cpp
index 65d4b73..4a7c4f5 100644
--- a/src/chips/opl_chip_base.cpp
+++ b/src/chips/opl_chip_base.cpp
@@ -20,3 +20,33 @@ void OPLChipBase::reset(uint32_t rate)
 {
     setRate(rate);
 }
+
+int OPLChipBase::generate32(int32_t *output, size_t frames)
+{
+    enum { maxFramesAtOnce = 256 };
+    int16_t temp[2 * maxFramesAtOnce];
+    for(size_t left = frames; left > 0;) {
+        size_t count = (left < maxFramesAtOnce) ? left : maxFramesAtOnce;
+        generate(temp, count);
+        for(size_t i = 0; i < 2 * count; ++i)
+            output[i] = temp[i];
+        left -= count;
+        output += 2 * count;
+    }
+    return (int)frames;
+}
+
+int OPLChipBase::generateAndMix32(int32_t *output, size_t frames)
+{
+    enum { maxFramesAtOnce = 256 };
+    int16_t temp[2 * maxFramesAtOnce];
+    for(size_t left = frames; left > 0;) {
+        size_t count = (left < maxFramesAtOnce) ? left : maxFramesAtOnce;
+        generate(temp, count);
+        for(size_t i = 0; i < 2 * count; ++i)
+            output[i] += temp[i];
+        left -= count;
+        output += 2 * count;
+    }
+    return (int)frames;
+}
diff --git a/src/chips/opl_chip_base.h b/src/chips/opl_chip_base.h
index 70f9375..3ab4cb8 100644
--- a/src/chips/opl_chip_base.h
+++ b/src/chips/opl_chip_base.h
@@ -19,8 +19,8 @@ public:
     virtual void writeReg(uint16_t addr, uint8_t data) = 0;
     virtual int generate(int16_t *output, size_t frames) = 0;
     virtual int generateAndMix(int16_t *output, size_t frames) = 0;
-    virtual int generate32(int32_t *output, size_t frames) = 0;
-    virtual int generateAndMix32(int32_t *output, size_t frames) = 0;
+    virtual int generate32(int32_t *output, size_t frames);
+    virtual int generateAndMix32(int32_t *output, size_t frames);
     virtual const char* emulatorName() = 0;
 };