1 files changed, 272 insertions, 0 deletions
diff --git a/libs/nanovg/example/example_fbo.c b/libs/nanovg/example/example_fbo.c
new file mode 100644
index 0000000..cff4ed2
--- /dev/null
+++ b/libs/nanovg/example/example_fbo.c
@@ -0,0 +1,272 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdio.h>
+#ifdef NANOVG_GLEW
+#	include <GL/glew.h>
+#endif
+#ifdef __APPLE__
+#	define GLFW_INCLUDE_GLCOREARB
+#endif
+#include <GLFW/glfw3.h>
+#include "nanovg.h"
+#define NANOVG_GL3_IMPLEMENTATION
+#include "nanovg_gl.h"
+#include "nanovg_gl_utils.h"
+#include "perf.h"
+
+void renderPattern(NVGcontext* vg, NVGLUframebuffer* fb, float t, float pxRatio)
+{
+	int winWidth, winHeight;
+	int fboWidth, fboHeight;
+	int pw, ph, x, y;
+	float s = 20.0f;
+	float sr = (cosf(t)+1)*0.5f;
+	float r = s * 0.6f * (0.2f + 0.8f * sr);
+
+	if (fb == NULL) return;
+
+	nvgImageSize(vg, fb->image, &fboWidth, &fboHeight);
+	winWidth = (int)(fboWidth / pxRatio);
+	winHeight = (int)(fboHeight / pxRatio);
+
+	// Draw some stuff to an FBO as a test
+	nvgluBindFramebuffer(fb);
+	glViewport(0, 0, fboWidth, fboHeight);
+	glClearColor(0, 0, 0, 0);
+	glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
+	nvgBeginFrame(vg, winWidth, winHeight, pxRatio);
+
+	pw = (int)ceilf(winWidth / s);
+	ph = (int)ceilf(winHeight / s);
+
+	nvgBeginPath(vg);
+	for (y = 0; y < ph; y++) {
+		for (x = 0; x < pw; x++) {
+			float cx = (x+0.5f) * s;
+			float cy = (y+0.5f) * s;
+			nvgCircle(vg, cx,cy, r);
+		}
+	}
+	nvgFillColor(vg, nvgRGBA(220,160,0,200));
+	nvgFill(vg);
+
+	nvgEndFrame(vg);
+	nvgluBindFramebuffer(NULL);
+}
+
+int loadFonts(NVGcontext* vg)
+{
+	int font;
+	font = nvgCreateFont(vg, "sans", "../example/Roboto-Regular.ttf");
+	if (font == -1) {
+		printf("Could not add font regular.\n");
+		return -1;
+	}
+	font = nvgCreateFont(vg, "sans-bold", "../example/Roboto-Bold.ttf");
+	if (font == -1) {
+		printf("Could not add font bold.\n");
+		return -1;
+	}
+	return 0;
+}
+
+void errorcb(int error, const char* desc)
+{
+	printf("GLFW error %d: %s\n", error, desc);
+}
+
+static void key(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+	NVG_NOTUSED(scancode);
+	NVG_NOTUSED(mods);
+	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+		glfwSetWindowShouldClose(window, GL_TRUE);
+}
+
+int main()
+{
+	GLFWwindow* window;
+	NVGcontext* vg = NULL;
+	GPUtimer gpuTimer;
+	PerfGraph fps, cpuGraph, gpuGraph;
+	double prevt = 0, cpuTime = 0;
+	NVGLUframebuffer* fb = NULL;
+	int winWidth, winHeight;
+	int fbWidth, fbHeight;
+	float pxRatio;
+
+	if (!glfwInit()) {
+		printf("Failed to init GLFW.");
+		return -1;
+	}
+
+	initGraph(&fps, GRAPH_RENDER_FPS, "Frame Time");
+	initGraph(&cpuGraph, GRAPH_RENDER_MS, "CPU Time");
+	initGraph(&gpuGraph, GRAPH_RENDER_MS, "GPU Time");
+
+	glfwSetErrorCallback(errorcb);
+#ifndef _WIN32 // don't require this on win32, and works with more cards
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#endif
+	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, 1);
+
+#ifdef DEMO_MSAA
+	glfwWindowHint(GLFW_SAMPLES, 4);
+#endif
+	window = glfwCreateWindow(1000, 600, "NanoVG", NULL, NULL);
+//	window = glfwCreateWindow(1000, 600, "NanoVG", glfwGetPrimaryMonitor(), NULL);
+	if (!window) {
+		glfwTerminate();
+		return -1;
+	}
+
+	glfwSetKeyCallback(window, key);
+
+	glfwMakeContextCurrent(window);
+#ifdef NANOVG_GLEW
+	glewExperimental = GL_TRUE;
+	if(glewInit() != GLEW_OK) {
+		printf("Could not init glew.\n");
+		return -1;
+	}
+	// GLEW generates GL error because it calls glGetString(GL_EXTENSIONS), we'll consume it here.
+	glGetError();
+#endif
+
+#ifdef DEMO_MSAA
+	vg = nvgCreateGL3(NVG_STENCIL_STROKES | NVG_DEBUG);
+#else
+	vg = nvgCreateGL3(NVG_ANTIALIAS | NVG_STENCIL_STROKES | NVG_DEBUG);
+#endif
+	if (vg == NULL) {
+		printf("Could not init nanovg.\n");
+		return -1;
+	}
+
+	// Create hi-dpi FBO for hi-dpi screens.
+	glfwGetWindowSize(window, &winWidth, &winHeight);
+	glfwGetFramebufferSize(window, &fbWidth, &fbHeight);
+	// Calculate pixel ration for hi-dpi devices.
+	pxRatio = (float)fbWidth / (float)winWidth;
+
+	// The image pattern is tiled, set repeat on x and y.
+	fb = nvgluCreateFramebuffer(vg, (int)(100*pxRatio), (int)(100*pxRatio), NVG_IMAGE_REPEATX | NVG_IMAGE_REPEATY);
+	if (fb == NULL) {
+		printf("Could not create FBO.\n");
+		return -1;
+	}
+
+	if (loadFonts(vg) == -1) {
+		printf("Could not load fonts\n");
+		return -1;
+	}
+
+	glfwSwapInterval(0);
+
+	initGPUTimer(&gpuTimer);
+
+	glfwSetTime(0);
+	prevt = glfwGetTime();
+
+	while (!glfwWindowShouldClose(window))
+	{
+		double mx, my, t, dt;
+		float gpuTimes[3];
+		int i, n;
+
+		t = glfwGetTime();
+		dt = t - prevt;
+		prevt = t;
+
+		startGPUTimer(&gpuTimer);
+
+		glfwGetCursorPos(window, &mx, &my);
+		glfwGetWindowSize(window, &winWidth, &winHeight);
+		glfwGetFramebufferSize(window, &fbWidth, &fbHeight);
+		// Calculate pixel ration for hi-dpi devices.
+		pxRatio = (float)fbWidth / (float)winWidth;
+
+		renderPattern(vg, fb, t, pxRatio);
+
+		// Update and render
+		glViewport(0, 0, fbWidth, fbHeight);
+		glClearColor(0.3f, 0.3f, 0.32f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
+
+		nvgBeginFrame(vg, winWidth, winHeight, pxRatio);
+
+		// Use the FBO as image pattern.
+		if (fb != NULL) {
+			NVGpaint img = nvgImagePattern(vg, 0, 0, 100, 100, 0, fb->image, 1.0f);
+			nvgSave(vg);
+
+			for (i = 0; i < 20; i++) {
+				nvgBeginPath(vg);
+				nvgRect(vg, 10 + i*30,10, 10, winHeight-20);
+				nvgFillColor(vg, nvgHSLA(i/19.0f, 0.5f, 0.5f, 255));
+				nvgFill(vg);
+			}
+
+			nvgBeginPath(vg);
+			nvgRoundedRect(vg, 140 + sinf(t*1.3f)*100, 140 + cosf(t*1.71244f)*100, 250, 250, 20);
+			nvgFillPaint(vg, img);
+			nvgFill(vg);
+			nvgStrokeColor(vg, nvgRGBA(220,160,0,255));
+			nvgStrokeWidth(vg, 3.0f);
+			nvgStroke(vg);
+
+			nvgRestore(vg);
+		}
+
+		renderGraph(vg, 5,5, &fps);
+		renderGraph(vg, 5+200+5,5, &cpuGraph);
+		if (gpuTimer.supported)
+			renderGraph(vg, 5+200+5+200+5,5, &gpuGraph);
+
+		nvgEndFrame(vg);
+
+		// Measure the CPU time taken excluding swap buffers (as the swap may wait for GPU)
+		cpuTime = glfwGetTime() - t;
+
+		updateGraph(&fps, dt);
+		updateGraph(&cpuGraph, cpuTime);
+
+		// We may get multiple results.
+		n = stopGPUTimer(&gpuTimer, gpuTimes, 3);
+		for (i = 0; i < n; i++)
+			updateGraph(&gpuGraph, gpuTimes[i]);
+
+		glfwSwapBuffers(window);
+		glfwPollEvents();
+	}
+
+	nvgluDeleteFramebuffer(fb);
+
+	nvgDeleteGL3(vg);
+
+	printf("Average Frame Time: %.2f ms\n", getGraphAverage(&fps) * 1000.0f);
+	printf("          CPU Time: %.2f ms\n", getGraphAverage(&cpuGraph) * 1000.0f);
+	printf("          GPU Time: %.2f ms\n", getGraphAverage(&gpuGraph) * 1000.0f);
+
+	glfwTerminate();
+	return 0;
+}