49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
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/*
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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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/*
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Functions:
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CGLM_INLINE void glm_persp_decomp_far(mat4 proj, float *farZ)
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CGLM_INLINE float glm_persp_fovy(mat4 proj)
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CGLM_INLINE float glm_persp_aspect(mat4 proj)
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CGLM_INLINE void glm_persp_sizes(mat4 proj, float fovy, vec4 dest)
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*/
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#ifndef cglm_persp_h
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#define cglm_persp_h
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#include "../common.h"
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#include "../plane.h"
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#include "../mat4.h"
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/*!
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* @brief returns field of view angle along the Y-axis (in radians)
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*
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* if you need to degrees, use glm_deg to convert it or use this:
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* fovy_deg = glm_deg(glm_persp_fovy(projMatrix))
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*
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* @param[in] proj perspective projection matrix
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*/
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CGLM_INLINE
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float
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glm_persp_fovy(mat4 proj) {
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return 2.0f * atanf(1.0f / proj[1][1]);
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}
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/*!
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* @brief returns aspect ratio of perspective projection
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*
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* @param[in] proj perspective projection matrix
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*/
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CGLM_INLINE
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float
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glm_persp_aspect(mat4 proj) {
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return proj[1][1] / proj[0][0];
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}
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#endif /* cglm_persp_h */
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