INput

apps/RenderCadenceCompositor/render/InputFrameTexture.cpp

@@ -0,0 +1,83 @@
+#include "InputFrameTexture.h"
+
+InputFrameTexture::~InputFrameTexture()
+{
+	ShutdownGl();
+}
+
+GLuint InputFrameTexture::PollAndUpload(InputFrameMailbox* mailbox)
+{
+	if (mailbox == nullptr)
+		return mTexture;
+
+	InputFrame frame;
+	if (!mailbox->TryAcquireLatest(frame))
+	{
+		++mUploadMisses;
+		return mTexture;
+	}
+
+	if (frame.bytes != nullptr && frame.pixelFormat == VideoIOPixelFormat::Bgra8 && EnsureTexture(frame))
+	{
+		glBindTexture(GL_TEXTURE_2D, mTexture);
+		glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+		glPixelStorei(GL_UNPACK_ROW_LENGTH, frame.rowBytes > 0 ? static_cast<GLint>(frame.rowBytes / 4) : 0);
+		glTexSubImage2D(
+			GL_TEXTURE_2D,
+			0,
+			0,
+			0,
+			static_cast<GLsizei>(frame.width),
+			static_cast<GLsizei>(frame.height),
+			GL_BGRA,
+			GL_UNSIGNED_INT_8_8_8_8_REV,
+			frame.bytes);
+		glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+		glBindTexture(GL_TEXTURE_2D, 0);
+		++mUploadedFrames;
+	}
+
+	mailbox->Release(frame);
+	return mTexture;
+}
+
+void InputFrameTexture::ShutdownGl()
+{
+	if (mTexture != 0)
+		glDeleteTextures(1, &mTexture);
+	mTexture = 0;
+	mWidth = 0;
+	mHeight = 0;
+}
+
+bool InputFrameTexture::EnsureTexture(const InputFrame& frame)
+{
+	if (frame.width == 0 || frame.height == 0)
+		return false;
+
+	if (mTexture != 0 && mWidth == frame.width && mHeight == frame.height)
+		return true;
+
+	ShutdownGl();
+	glGenTextures(1, &mTexture);
+	glBindTexture(GL_TEXTURE_2D, mTexture);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexImage2D(
+		GL_TEXTURE_2D,
+		0,
+		GL_RGBA8,
+		static_cast<GLsizei>(frame.width),
+		static_cast<GLsizei>(frame.height),
+		0,
+		GL_BGRA,
+		GL_UNSIGNED_INT_8_8_8_8_REV,
+		nullptr);
+	glBindTexture(GL_TEXTURE_2D, 0);
+
+	mWidth = frame.width;
+	mHeight = frame.height;
+	return mTexture != 0;
+}