ccore/test/modules/FrustumTests.c

#include "../Tests.h"
#include "core/Frustum.h"
#include "core/ToString.h"

static void testToString() {
    Frustum f;
    initFrustum(&f, 60.0f, 0.1f, 1000.0f);
    TEST_FLOAT(0.577f, f.tan, 0.01f);
    TEST_FLOAT(0.100f, f.nearClip, 0.01f);
    TEST_FLOAT(1000.0f, f.farClip, 0.01f);
}

static void testPointIsInside() {
    Frustum f;
    initFrustum(&f, 60.0f, 0.1f, 1000.0f);
    updateFrustumPlanes(&f, &V(0, 0, 0), &V(1, 0, 0), &V(0, 1, 0), &V(0, 0, 1),
                        &IV(200, 100));

    TEST_TRUE(isInsideFrustum(&f, &V(0, 0, 5)));
    TEST_FALSE(isInsideFrustum(&f, &V(0, 0, 1004)));
    TEST_FALSE(isInsideFrustum(&f, &V(0, 0, -5)));
    TEST_FALSE(isInsideFrustum(&f, &V(0, 50, 5)));
    TEST_FALSE(isInsideFrustum(&f, &V(0, -50, 5)));
    TEST_FALSE(isInsideFrustum(&f, &V(50, 0, 5)));
    TEST_FALSE(isInsideFrustum(&f, &V(-50, 0, 5)));
}

static void testSphereIsInside() {
    IntVector2 size = {{200, 100}};
    Frustum f;
    initFrustum(&f, 60.0f, 0.1f, 1000.0f);
    updateFrustumPlanes(&f, &V(0, 0, 0), &V(1, 0, 0), &V(0, 1, 0), &V(0, 0, 1),
                        &size);

    TEST_TRUE(isInsideFrustumRadius(&f, &V(0, 0, 5), 3));
    TEST_FALSE(isInsideFrustumRadius(&f, &V(0, 0, 1004), 3));
    TEST_FALSE(isInsideFrustumRadius(&f, &V(0, 0, -5), 3));
    TEST_FALSE(isInsideFrustumRadius(&f, &V(0, 50, 5), 3));
    TEST_FALSE(isInsideFrustumRadius(&f, &V(0, -50, 5), 3));
    TEST_FALSE(isInsideFrustumRadius(&f, &V(50, 0, 5), 3));
    TEST_FALSE(isInsideFrustumRadius(&f, &V(-50, 0, 5), 3));

    TEST_TRUE(isInsideFrustumRadius(&f, &V(0, 0, 5), 3));
    TEST_TRUE(isInsideFrustumRadius(&f, &V(0, 0, 1004), 50));
    TEST_TRUE(isInsideFrustumRadius(&f, &V(0, 0, -5), 50));
    TEST_TRUE(isInsideFrustumRadius(&f, &V(0, 50, 5), 50));
    TEST_TRUE(isInsideFrustumRadius(&f, &V(0, -50, 5), 50));
    TEST_TRUE(isInsideFrustumRadius(&f, &V(50, 0, 5), 50));
    TEST_TRUE(isInsideFrustumRadius(&f, &V(-50, 0, 5), 50));
}

static void testUpdateProjection() {
    Frustum f;
    initFrustum(&f, 60.0f, 0.1f, 1000.0f);
    const Matrix* m = updateProjection(&f, &IV(400, 300));
    char buffer[128];
    toString(m, buffer, sizeof(buffer));
    TEST_STRING("[[1.299, 0.000, 0.000, 0.000], "
                "[0.000, 1.732, 0.000, 0.000], "
                "[0.000, 0.000, -1.000, -0.200], "
                "[0.000, 0.000, -1.000, 0.000]]",
                buffer);
}

void testFrustum() {
    testToString();
    testPointIsInside();
    testSphereIsInside();
    testUpdateProjection();
}