173 lines
4.6 KiB
C
173 lines
4.6 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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#ifndef cglm_project_h
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#define cglm_project_h
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#include "common.h"
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#include "vec3.h"
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#include "vec4.h"
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#include "mat4.h"
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#ifndef CGLM_CLIPSPACE_INCLUDE_ALL
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# if CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_ZO_BIT
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# include "clipspace/project_zo.h"
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# elif CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_NO_BIT
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# include "clipspace/project_no.h"
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# endif
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#else
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# include "clipspace/project_zo.h"
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# include "clipspace/project_no.h"
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#endif
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/*!
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* @brief maps the specified viewport coordinates into specified space [1]
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* the matrix should contain projection matrix.
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*
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* if you don't have ( and don't want to have ) an inverse matrix then use
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* glm_unproject version. You may use existing inverse of matrix in somewhere
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* else, this is why glm_unprojecti exists to save save inversion cost
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*
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* [1] space:
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* 1- if m = invProj: View Space
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* 2- if m = invViewProj: World Space
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* 3- if m = invMVP: Object Space
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*
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* You probably want to map the coordinates into object space
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* so use invMVP as m
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*
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* Computing viewProj:
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* glm_mat4_mul(proj, view, viewProj);
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* glm_mat4_mul(viewProj, model, MVP);
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* glm_mat4_inv(viewProj, invMVP);
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*
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* @param[in] pos point/position in viewport coordinates
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* @param[in] invMat matrix (see brief)
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* @param[in] vp viewport as [x, y, width, height]
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* @param[out] dest unprojected coordinates
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*/
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CGLM_INLINE
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void
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glm_unprojecti(vec3 pos, mat4 invMat, vec4 vp, vec3 dest) {
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#if CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_ZO_BIT
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glm_unprojecti_zo(pos, invMat, vp, dest);
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#elif CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_NO_BIT
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glm_unprojecti_no(pos, invMat, vp, dest);
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#endif
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}
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/*!
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* @brief maps the specified viewport coordinates into specified space [1]
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* the matrix should contain projection matrix.
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*
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* this is same as glm_unprojecti except this function get inverse matrix for
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* you.
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*
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* [1] space:
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* 1- if m = proj: View Space
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* 2- if m = viewProj: World Space
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* 3- if m = MVP: Object Space
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*
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* You probably want to map the coordinates into object space
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* so use MVP as m
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*
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* Computing viewProj and MVP:
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* glm_mat4_mul(proj, view, viewProj);
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* glm_mat4_mul(viewProj, model, MVP);
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*
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* @param[in] pos point/position in viewport coordinates
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* @param[in] m matrix (see brief)
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* @param[in] vp viewport as [x, y, width, height]
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* @param[out] dest unprojected coordinates
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*/
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CGLM_INLINE
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void
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glm_unproject(vec3 pos, mat4 m, vec4 vp, vec3 dest) {
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mat4 inv;
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glm_mat4_inv(m, inv);
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glm_unprojecti(pos, inv, vp, dest);
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}
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/*!
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* @brief map object coordinates to window coordinates
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*
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* Computing MVP:
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* glm_mat4_mul(proj, view, viewProj);
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* glm_mat4_mul(viewProj, model, MVP);
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*
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* @param[in] pos object coordinates
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* @param[in] m MVP matrix
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* @param[in] vp viewport as [x, y, width, height]
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* @param[out] dest projected coordinates
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*/
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CGLM_INLINE
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void
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glm_project(vec3 pos, mat4 m, vec4 vp, vec3 dest) {
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#if CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_ZO_BIT
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glm_project_zo(pos, m, vp, dest);
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#elif CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_NO_BIT
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glm_project_no(pos, m, vp, dest);
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#endif
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}
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/*!
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* @brief map object's z coordinate to window coordinates
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*
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* Computing MVP:
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* glm_mat4_mul(proj, view, viewProj);
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* glm_mat4_mul(viewProj, model, MVP);
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*
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* @param[in] v object coordinates
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* @param[in] m MVP matrix
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*
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* @returns projected z coordinate
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*/
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CGLM_INLINE
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float
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glm_project_z(vec3 v, mat4 m) {
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#if CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_ZO_BIT
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return glm_project_z_zo(v, m);
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#elif CGLM_CONFIG_CLIP_CONTROL & CGLM_CLIP_CONTROL_NO_BIT
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return glm_project_z_no(v, m);
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#endif
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}
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/*!
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* @brief define a picking region
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*
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* @param[in] center center [x, y] of a picking region in window coordinates
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* @param[in] size size [width, height] of the picking region in window coordinates
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* @param[in] vp viewport as [x, y, width, height]
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* @param[out] dest projected coordinates
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*/
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CGLM_INLINE
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void
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glm_pickmatrix(vec2 center, vec2 size, vec4 vp, mat4 dest) {
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mat4 res;
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vec3 v;
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if (size[0] <= 0.0f || size[1] <= 0.0f)
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return;
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/* Translate and scale the picked region to the entire window */
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v[0] = (vp[2] - 2.0f * (center[0] - vp[0])) / size[0];
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v[1] = (vp[3] - 2.0f * (center[1] - vp[1])) / size[1];
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v[2] = 0.0f;
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glm_translate_make(res, v);
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v[0] = vp[2] / size[0];
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v[1] = vp[3] / size[1];
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v[2] = 1.0f;
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glm_scale(res, v);
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glm_mat4_copy(res, dest);
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}
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#endif /* cglm_project_h */
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