Init

kaplademo/source/demoFramework/RenderTarget.cpp

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+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of NVIDIA CORPORATION nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Copyright (c) 2018 NVIDIA Corporation. All rights reserved.
+
+#include "RenderTarget.h"
+
+
+// -------------------------------------------------------------------------------------------
+RenderTarget::RenderTarget(int width, int height)
+{
+	mColorTexId = 0;
+	mDepthTexId = 0;
+	mFBO = NULL;
+
+	resize(width, height);
+}
+
+// -------------------------------------------------------------------------------------------
+void RenderTarget::clear()
+{
+	if (mColorTexId > 0) {
+		glDeleteTextures(1, &mColorTexId);
+		mColorTexId = 0;
+	}
+	if (mDepthTexId > 0) {
+		glDeleteTextures(1, &mDepthTexId);
+		mDepthTexId = 0;
+	}
+	if (mFBO)
+		delete mFBO;
+
+	mFBO = NULL;
+}
+
+// -------------------------------------------------------------------------------------------
+RenderTarget::~RenderTarget()
+{
+	clear();
+}
+
+// -------------------------------------------------------------------------------------------
+GLuint RenderTarget::createTexture(GLenum target, int width, int height, GLint internalFormat, GLenum format)
+{
+	GLuint texid;
+    glGenTextures(1, &texid);
+    glBindTexture(target, texid);
+
+    glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    glTexImage2D(target, 0, internalFormat, width, height, 0, format, GL_FLOAT, 0);
+    return texid;
+}
+
+// -------------------------------------------------------------------------------------------
+void RenderTarget::resize(int width, int height)
+{
+	clear();
+	mFBO = new FrameBufferObject();
+	mColorTexId = createTexture(GL_TEXTURE_RECTANGLE_ARB, width, height, GL_RGBA8, GL_RGBA);
+    mDepthTexId = createTexture(GL_TEXTURE_RECTANGLE_ARB, width, height, GL_DEPTH_COMPONENT32_ARB, GL_DEPTH_COMPONENT);
+}
+
+// -------------------------------------------------------------------------------------------
+void RenderTarget::beginCapture()
+{
+	mFBO->Bind();
+    mFBO->AttachTexture(GL_TEXTURE_RECTANGLE_ARB, mColorTexId, GL_COLOR_ATTACHMENT0_EXT);
+    mFBO->AttachTexture(GL_TEXTURE_RECTANGLE_ARB, mDepthTexId, GL_DEPTH_ATTACHMENT_EXT);
+    mFBO->IsValid();
+}
+
+// -------------------------------------------------------------------------------------------
+void RenderTarget::endCapture()
+{
+    mFBO->AttachTexture(GL_TEXTURE_RECTANGLE_ARB, 0, GL_COLOR_ATTACHMENT0_EXT);
+    mFBO->AttachTexture(GL_TEXTURE_RECTANGLE_ARB, 0, GL_DEPTH_ATTACHMENT_EXT);
+    mFBO->Disable();
+}
+
+
+