move gl rendering to another thread

2019-01-15 17:48:36 +11:00
parent f3b0a3355c
commit 658a6d379e
15 changed files with 872 additions and 585 deletions
@@ -0,0 +1,111 @@
+#include "renderthread.h"
+
+#include <QApplication>
+#include <QImage>
+#include <QOpenGLFunctions>
+#include <QDebug>
+
+#include "ui/renderfunctions.h"
+
+RenderThread::RenderThread() :
+	share_ctx(nullptr),
+	ctx(nullptr),
+	frameBuffer(0),
+	texColorBuffer(0)
+{
+	surface.create();
+}
+
+RenderThread::~RenderThread() {
+	surface.destroy();
+}
+
+void RenderThread::run() {
+	mutex.lock();
+
+	bool running = true;
+
+	while (running) {
+		waitCond.wait(&mutex);
+
+		if (share_ctx != nullptr) {
+			if (ctx == nullptr) {
+				ctx = new QOpenGLContext();
+				ctx->setFormat(share_ctx->format());
+				ctx->setShareContext(share_ctx);
+				ctx->create();
+				ctx->makeCurrent(&surface);
+			}
+
+			if (ctx != nullptr) {
+				// gen fbo
+				if (frameBuffer == 0) {
+					ctx->functions()->glGenFramebuffers(1, &frameBuffer);
+				}
+
+				// bind
+				ctx->functions()->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frameBuffer);
+
+				// gen texture
+				if (texColorBuffer == 0) {
+					glGenTextures(1, &texColorBuffer);
+					glBindTexture(GL_TEXTURE_2D, texColorBuffer);
+					glTexImage2D(
+						GL_TEXTURE_2D, 0, GL_RGB, 1920, 1080, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr
+					);
+					glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+					glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+					ctx->functions()->glFramebufferTexture2D(
+						GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texColorBuffer, 0
+					);
+					glBindTexture(GL_TEXTURE_2D, 0);
+				}
+
+				// draw
+				paint();
+
+				// flush changes
+				glFlush();
+
+				// release
+				ctx->functions()->glBindFramebuffer(GL_FRAMEBUFFER, 0);
+			}
+		}
+	}
+
+	if (ctx != nullptr) {
+		if (frameBuffer != 0) ctx->functions()->glDeleteFramebuffers(1, &frameBuffer);
+		ctx->doneCurrent();
+		delete ctx;
+	}
+
+	mutex.unlock();
+}
+
+void RenderThread::paint() {
+	glClearColor(0, 0, 0, 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glLoadIdentity();
+
+	glClearColor(0, 0, 0, 0);
+	glMatrixMode(GL_MODELVIEW);
+	glEnable(GL_TEXTURE_2D);
+	glEnable(GL_BLEND);
+	glEnable(GL_DEPTH);
+
+	Effect* gizmos; // does nothing yet
+	QVector<Clip*> nests;
+
+	compose_sequence(nullptr, ctx, seq, nests, true, false, &gizmos);
+
+	glDisable(GL_DEPTH);
+	glDisable(GL_BLEND);
+	glDisable(GL_TEXTURE_2D);
+}
+
+void RenderThread::start_render(QOpenGLContext *share, Sequence *s) {
+	share_ctx = share;
+	seq = s;
+	waitCond.wakeAll();
+}