From a858bf28df3a39235b46a905d3c6b6b1b43eb9a0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Bl=C3=A1ha?= <blaha.j502@gmail.com>
Date: Sat, 31 Aug 2024 18:09:33 +0200
Subject: [PATCH] shader updates

---
 src/shaders/fragment_to_equirectangular.glsl | 13 +++++++------
 src/shaders/fragment_to_mercator.glsl        | 13 +++++++------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/src/shaders/fragment_to_equirectangular.glsl b/src/shaders/fragment_to_equirectangular.glsl
index 94240ba..f94fdd8 100644
--- a/src/shaders/fragment_to_equirectangular.glsl
+++ b/src/shaders/fragment_to_equirectangular.glsl
@@ -1,11 +1,12 @@
 #version 330
+
 in vec2 fragCoord;
 out vec4 fragColor;
-uniform sampler2D texture;
+uniform sampler2D textureSampler;
 
-#define M_PI 3.1415926535897932
-#define M_E 2.7182818284590452
-#define M_MAX 1.4844222297453324
+const float M_PI = 3.1415926535897932;
+const float M_E = 2.7182818284590452;
+const float MERC_MAX = 1.4844222297453324;
 
 float remap(float value, float oldMin, float oldMax, float newMin, float newMax)
 {
@@ -15,7 +16,7 @@ float remap(float value, float oldMin, float oldMax, float newMin, float newMax)
 vec2 equi_to_merc(float u, float v)
 {
     // uv to equirectangular
-    float lon = remap(v, 0, 1, -M_MAX, M_MAX);
+    float lon = remap(v, 0, 1, -MERC_MAX, MERC_MAX);
 
     // equirectangular to mercator
     float y = log(tan(M_PI / 4 + lon / 2));
@@ -29,5 +30,5 @@ vec2 equi_to_merc(float u, float v)
 void main()
 {
     vec2 uv = equi_to_merc(fragCoord.x, fragCoord.y);
-    fragColor = texture2D(texture, uv);
+    fragColor = texture(textureSampler, uv);
 }
\ No newline at end of file
diff --git a/src/shaders/fragment_to_mercator.glsl b/src/shaders/fragment_to_mercator.glsl
index 611f975..6d05626 100644
--- a/src/shaders/fragment_to_mercator.glsl
+++ b/src/shaders/fragment_to_mercator.glsl
@@ -1,11 +1,12 @@
 #version 330
+
 in vec2 fragCoord;
 out vec4 fragColor;
-uniform sampler2D texture;
+uniform sampler2D textureSampler;
 
-#define M_PI 3.1415926535897932
-#define M_E 2.7182818284590452
-#define M_MAX 1.4844222297453324
+const float M_PI = 3.1415926535897932;
+const float M_E = 2.7182818284590452;
+const float MERC_MAX = 1.4844222297453324;
 
 float remap(float value, float oldMin, float oldMax, float newMin, float newMax)
 {
@@ -21,7 +22,7 @@ vec2 merc_to_equi(float u, float v)
     float y = 2 * atan(pow(M_E, lon)) - M_PI * 0.5;
 
     // equirectangular to uv
-    y = remap(y, -M_MAX, M_MAX, 0, 1);
+    y = remap(y, -MERC_MAX, MERC_MAX, 0, 1);
 
     return vec2(u, y);
 }
@@ -29,5 +30,5 @@ vec2 merc_to_equi(float u, float v)
 void main()
 {
     vec2 uv = merc_to_equi(fragCoord.x, fragCoord.y);
-    fragColor = texture2D(texture, uv);
+    fragColor = texture(textureSampler, uv);
 }
\ No newline at end of file