50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
#pragma once
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#include "math.h"
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typedef struct gnMat4x4 {
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float mat[4][4];
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} gnMat4x4;
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typedef gnMat4x4 gnMat4;
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static inline const gnMat4x4 gnIdentity() {
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return (gnMat4x4){
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.mat = {
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{ 1.0f, 0.0f, 0.0f, 0.0f },
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{ 0.0f, 1.0f, 0.0f, 0.0f },
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{ 0.0f, 0.0f, 1.0f, 0.0f },
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{ 0.0f, 0.0f, 0.0f, 1.0f }
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}
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};
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}
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static inline const gnMat4x4 gnOrthographic(
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float left, float right, float top, float bottom, float near, float far
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) {
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return (gnMat4x4){
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.mat = {
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{ (2)/(right-left), 0.0f, 0.0f, -((right+left)/(right-left)) },
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{ 0.0f, 2/(top-bottom), 0.0f, -((top+bottom)/(top-bottom)) },
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{ 0.0f, 0.0f, -2/(far-near), -((far+near)/(far-near)) },
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{ 0.0f, 0.0f, 0.0f, 1.0f }
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}
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};
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}
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static inline const gnMat4x4 gnProjection(
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float fov, float aspect, float near, float far
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) {
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return (gnMat4x4){
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.mat = {
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{ 1/(aspect * tan(fov/2)), 0.0f, 0.0f, 0.0f },
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{ 0.0f, 1/tan(fov/2), 0.0f, 0.0f },
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{ 0.0f, 0.0f, -((far+near)/(far-near)), -((2*far*near)/(far-near)) },
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{ 0.0f, 0.0f, -1.0f, 1.0f }
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// { 1/(aspect * tan(fov/2)), 0.0f, 0.0f, 0.0f },
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// { 0.0f, 1/tan(fov/2), 0.0f, 0.0f },
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// { 0.0f, 0.0f, -((far+near)/(far-near)), -((2*far*near)/(far-near)) },
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// { 0.0f, 0.0f, -1.0f, 0.0f }
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}
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};
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}
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