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1bce62c371
This commit adds the function `glm_perspective_lh_zo`, modelled on the implementation of glm_perspective, but amended to provide a left-hand coordinate system expected by DirectX, Metal and Vulkan (per the GLM project's `glm/detail/setup.hpp`). It uses a clip-space of zero-to-one. The function is tested against a longhand version of the algorithm it seeks to implement as well as against the output of the GLM project's `glm::perspectiveLH_ZO` function. This commit adds a new subdirectory `test/glm_cmp` which contains a basic CMake file and `main.cpp`. An interested user should link or copy or clone the GLM project into this directory. The `main` function can be used to print the reference data used so others can verify behaviour in the future, or add new literal reference values.
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* Copyright (c), Recep Aslantas.
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*
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* MIT License (MIT), http://opensource.org/licenses/MIT
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* Full license can be found in the LICENSE file
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*/
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#include "test_common.h"
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TEST_IMPL(perspective_lh_zo) {
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mat4 dst;
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const float fovy = glm_rad(45.0f);
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const float aspect = 640/480.0f;
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const float near = 0.1f;
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const float far = 100.0f;
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glm_perspective_lh_zo(fovy, aspect, near, far, dst);
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/* Sanity mk. I */
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/* Longhand version of what the above function _should_ be doing */
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ASSERT(test_eq(dst[0][0], 1 / (tanf(fovy / 2) * aspect)))
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ASSERT(test_eq(dst[1][1], 1 / tanf(fovy / 2)))
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ASSERT(test_eq(dst[2][2], far / (far - near)))
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ASSERT(test_eq(dst[2][3], 1.0f))
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ASSERT(test_eq(dst[3][2], -1 * far * near / (far - near)))
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/* Sanity mk. II */
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/* "Reference values" generated by GLM's glm::perspectiveLH_ZO */
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mat4 cmp = {0};
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cmp[0][0] = 1.8106601f;
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cmp[1][1] = 2.4142134f;
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cmp[2][2] = 1.0010010f;
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cmp[2][3] = 1.0000000f;
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cmp[3][2] = -0.1001001f;
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for (uint32_t i = 0 ; i < 16 ; i++) {
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uint32_t r = i%4, c = i/4;
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ASSERT(fabsf(dst[r][c] - cmp[r][c]) < GLM_FLT_EPSILON)
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}
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TEST_SUCCESS
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}
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TEST_IMPL(camera_lookat) {
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mat4 view1, view2;
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vec3 center,
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eye = {0.024f, 14.6f, 67.04f},
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dir = {0.0f, 0.0f, -1.0f},
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up = {0.0f, 1.0f, 0.0f};
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glm_vec3_add(eye, dir, center);
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glm_lookat(eye, center, up, view1);
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glm_look(eye, dir, up, view2);
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ASSERTIFY(test_assert_mat4_eq(view1, view2))
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TEST_SUCCESS
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}
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TEST_IMPL(camera_decomp) {
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mat4 proj, proj2;
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vec4 sizes;
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float aspect, fovy, nearZ, farZ;
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aspect = 0.782f;
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fovy = glm_rad(49.984f);
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nearZ = 0.1f;
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farZ = 100.0f;
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glm_perspective(fovy, aspect, nearZ, farZ, proj);
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ASSERT(fabsf(aspect - glm_persp_aspect(proj)) < GLM_FLT_EPSILON)
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ASSERT(fabsf(fovy - glm_persp_fovy(proj)) < GLM_FLT_EPSILON)
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ASSERT(fabsf(49.984f - glm_deg(glm_persp_fovy(proj))) < GLM_FLT_EPSILON)
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glm_persp_sizes(proj, fovy, sizes);
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glm_frustum(-sizes[0] * 0.5f,
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sizes[0] * 0.5f,
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-sizes[1] * 0.5f,
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sizes[1] * 0.5f,
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nearZ,
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farZ,
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proj2);
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ASSERTIFY(test_assert_mat4_eq(proj, proj2))
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TEST_SUCCESS
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}
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