From c0a4c245f0b992de6874f7143ea2e0020f682fa1 Mon Sep 17 00:00:00 2001
From: Recep Aslantas <info@recp.me>
Date: Thu, 28 May 2020 14:19:35 +0300
Subject: [PATCH] tests: add test for frustum

---
 test/src/test_camera.h | 68 ++++++++++++++++++++++++++++++++++++++++++
 test/src/tests.c       |  2 ++
 test/tests.h           |  8 +++++
 3 files changed, 78 insertions(+)
 create mode 100644 test/src/test_camera.h

diff --git a/test/src/test_camera.h b/test/src/test_camera.h
new file mode 100644
index 0000000..fb1075a
--- /dev/null
+++ b/test/src/test_camera.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c), Recep Aslantas.
+ *
+ * MIT License (MIT), http://opensource.org/licenses/MIT
+ * Full license can be found in the LICENSE file
+ */
+
+#include "test_common.h"
+
+TEST_IMPL(GLM_PREFIX, frustum) {
+  mat4  proj;
+  vec4  vp = {0.0f, 0.0f, 800.0f, 600.0f};
+  float left, right, top, bottom, znear, zfar;
+  
+  znear  =  0.1f;
+  zfar   =  100.0f;
+  left   = -100.0f;
+  right  =  100.0f;
+  bottom = -100.0f;
+  top    =  100.0f;
+  
+  GLM(frustum)(left, right, bottom, top, znear, zfar, proj);
+  
+  ASSERT(test_eq(proj[0][1], 0.0f))
+  ASSERT(test_eq(proj[0][2], 0.0f))
+  ASSERT(test_eq(proj[0][3], 0.0f))
+
+  ASSERT(test_eq(proj[1][0], 0.0f))
+  ASSERT(test_eq(proj[1][2], 0.0f))
+  ASSERT(test_eq(proj[1][3], 0.0f))
+
+  ASSERT(test_eq(proj[2][3], -1.0f))
+
+  ASSERT(test_eq(proj[3][0], 0.0f))
+  ASSERT(test_eq(proj[3][1], 0.0f))
+  ASSERT(test_eq(proj[3][3], 0.0f))
+
+  vec4  v1 = {1.0f, 20.0f, znear};
+  vec4  v2 = {1.0f, 20.0f, zfar};
+  vec4  v3, v4;
+
+  /* perspective test */
+  GLM(mat4_mulv)(proj, v1, v3);
+  GLM(project)(v3, proj, vp, v3);
+  
+  ASSERT(v3[0] > v1[0])
+  ASSERT(v3[1] > v1[1])
+  
+  GLM(mat4_mulv)(proj, v2, v4);
+  GLM(project)(v4, proj, vp, v4);
+  
+  ASSERT(v4[0] < v3[0])
+  ASSERT(v4[1] < v3[1])
+  
+  /* not infinity */
+  ASSERT(!GLM(vec4_isinf)(proj[0]))
+  ASSERT(!GLM(vec4_isinf)(proj[1]))
+  ASSERT(!GLM(vec4_isinf)(proj[2]))
+  ASSERT(!GLM(vec4_isinf)(proj[3]))
+  
+  /* not NaN */
+  ASSERT(!GLM(vec4_isnan)(proj[0]))
+  ASSERT(!GLM(vec4_isnan)(proj[1]))
+  ASSERT(!GLM(vec4_isnan)(proj[2]))
+  ASSERT(!GLM(vec4_isnan)(proj[3]))
+
+  TEST_SUCCESS
+}
diff --git a/test/src/tests.c b/test/src/tests.c
index ea9f902..2ea66c3 100644
--- a/test/src/tests.c
+++ b/test/src/tests.c
@@ -24,6 +24,7 @@
 #include "test_affine.h"
 #include "test_affine_mat.h"
 #include "test_ray.h"
+#include "test_camera.h"
 
 #undef GLM
 #undef GLM_PREFIX
@@ -46,6 +47,7 @@
 #include "test_affine.h"
 #include "test_affine_mat.h"
 #include "test_ray.h"
+#include "test_camera.h"
 
 #undef GLM
 #undef GLM_PREFIX
diff --git a/test/tests.h b/test/tests.h
index 7ce7eae..6ccfc91 100644
--- a/test/tests.h
+++ b/test/tests.h
@@ -199,6 +199,10 @@ TEST_DECLARE(glmc_mat2_rmc)
 TEST_DECLARE(camera_lookat)
 TEST_DECLARE(camera_decomp)
 
+TEST_DECLARE(glm_frustum)
+
+TEST_DECLARE(glmc_frustum)
+
 /* project */
 TEST_DECLARE(glm_unprojecti)
 TEST_DECLARE(glm_unproject)
@@ -890,6 +894,10 @@ TEST_LIST {
   TEST_ENTRY(camera_lookat)
   TEST_ENTRY(camera_decomp)
   
+  TEST_ENTRY(glm_frustum)
+  
+  TEST_ENTRY(glmc_frustum)
+  
   /* project */
   TEST_ENTRY(glm_unprojecti)
   TEST_ENTRY(glm_unproject)