Move demo programs to examples directory

These are not really tests, but examples or demos, which has caused some
confusion in the past.  So, move them, and make room for actual tests.

1 files changed, 170 insertions, 0 deletions

diff --git a/examples/demo_utils.h b/examples/demo_utils.h
new file mode 100644
index 0000000..94be68e
--- /dev/null
+++ b/examples/demo_utils.h
@@ -0,0 +1,170 @@
+/*
+  Copyright 2012-2019 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "pugl/pugl.h"
+
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+typedef struct {
+	double lastReportTime;
+} PuglFpsPrinter;
+
+typedef float vec4[4];
+typedef vec4  mat4[4];
+
+// clang-format off
+
+static const float cubeStripVertices[] = {
+	-1.0f,  1.0f,  1.0f, // Front top left
+	 1.0f,  1.0f,  1.0f, // Front top right
+	-1.0f, -1.0f,  1.0f, // Front bottom left
+	 1.0f, -1.0f,  1.0f, // Front bottom right
+	 1.0f, -1.0f, -1.0f, // Back bottom right
+	 1.0f,  1.0f,  1.0f, // Front top right
+	 1.0f,  1.0f, -1.0f, // Back top right
+	-1.0f,  1.0f,  1.0f, // Front top left
+	-1.0f,  1.0f, -1.0f, // Back top left
+	-1.0f, -1.0f,  1.0f, // Front bottom left
+	-1.0f, -1.0f, -1.0f, // Back bottom left
+	 1.0f, -1.0f, -1.0f, // Back bottom right
+	-1.0f,  1.0f, -1.0f, // Back top left
+	 1.0f,  1.0f, -1.0f  // Back top right
+};
+
+static const float cubeFrontLineLoop[] = {
+	-1.0f,  1.0f,  1.0f, // Front top left
+	 1.0f,  1.0f,  1.0f, // Front top right
+	 1.0f, -1.0f,  1.0f, // Front bottom right
+	-1.0f, -1.0f,  1.0f, // Front bottom left
+};
+
+static const float cubeBackLineLoop[] = {
+	-1.0f,  1.0f, -1.0f, // Back top left
+	 1.0f,  1.0f, -1.0f, // Back top right
+	 1.0f, -1.0f, -1.0f, // Back bottom right
+	-1.0f, -1.0f, -1.0f, // Back bottom left
+};
+
+static const float cubeSideLines[] = {
+	-1.0f,  1.0f,  1.0f, // Front top left
+	-1.0f,  1.0f, -1.0f, // Back top left
+
+	-1.0f, -1.0f,  1.0f, // Front bottom left
+	-1.0f, -1.0f, -1.0f, // Back bottom left
+
+	 1.0f,  1.0f,  1.0f, // Front top right
+	 1.0f,  1.0f, -1.0f, // Back top right
+
+	 1.0f, -1.0f,  1.0f, // Front bottom right
+	 1.0f, -1.0f, -1.0f, // Back bottom right
+};
+
+// clang-format on
+
+static inline void
+mat4Identity(mat4 m)
+{
+	for (int c = 0; c < 4; ++c) {
+		for (int r = 0; r < 4; ++r) {
+			m[c][r] = c == r ? 1.0f : 0.0f;
+		}
+	}
+}
+
+static inline void
+mat4Translate(mat4 m, const float x, const float y, const float z)
+{
+	m[3][0] = x;
+	m[3][1] = y;
+	m[3][2] = z;
+}
+
+static inline void
+mat4Mul(mat4 m, mat4 a, mat4 b)
+{
+	for (int c = 0; c < 4; ++c) {
+		for (int r = 0; r < 4; ++r) {
+			m[c][r] = 0.0f;
+			for (int k = 0; k < 4; ++k) {
+				m[c][r] += a[k][r] * b[c][k];
+			}
+		}
+	}
+}
+
+static inline void
+mat4Ortho(mat4        m,
+          const float l,
+          const float r,
+          const float b,
+          const float t,
+          const float n,
+          const float f)
+{
+	m[0][0] = 2.0f / (r - l);
+	m[0][1] = m[0][2] = m[0][3] = 0.0f;
+
+	m[1][1] = 2.0f / (t - b);
+	m[1][0] = m[1][2] = m[1][3] = 0.0f;
+
+	m[2][2] = -2.0f / (f - n);
+	m[2][0] = m[2][1] = m[2][3] = 0.0f;
+
+	m[3][0] = -(r + l) / (r - l);
+	m[3][1] = -(t + b) / (t - b);
+	m[3][2] = -(f + n) / (f - n);
+	m[3][3] = 1.0f;
+}
+
+/** Calculate a projection matrix for a given perspective. */
+static inline void
+perspective(float* m, float fov, float aspect, float zNear, float zFar)
+{
+	const float h     = tanf(fov);
+	const float w     = h / aspect;
+	const float depth = zNear - zFar;
+	const float q     = (zFar + zNear) / depth;
+	const float qn    = 2 * zFar * zNear / depth;
+
+	// clang-format off
+	m[0]  = w;  m[1]  = 0;  m[2]  = 0;   m[3]  = 0;
+	m[4]  = 0;  m[5]  = h;  m[6]  = 0;   m[7]  = 0;
+	m[8]  = 0;  m[9]  = 0;  m[10] = q;   m[11] = -1;
+	m[12] = 0;  m[13] = 0;  m[14] = qn;  m[15] = 0;
+	// clang-format on
+}
+
+static inline void
+puglPrintFps(const PuglWorld* world,
+             PuglFpsPrinter*  printer,
+             unsigned* const  framesDrawn)
+{
+	const double thisTime = puglGetTime(world);
+	if (thisTime > printer->lastReportTime + 5) {
+		const double fps = *framesDrawn / (thisTime - printer->lastReportTime);
+		fprintf(stderr,
+		        "%u frames in %.0f seconds = %.3f FPS\n",
+		        *framesDrawn,
+		        thisTime - printer->lastReportTime,
+		        fps);
+
+		printer->lastReportTime = thisTime;
+		*framesDrawn            = 0;
+	}
+}