Shaders for Android (GLES 2) (#10506)

Shader support for OpenGL ES 2 devices (Android)

Co-authored-by: sfan5 <sfan5@live.de>

1 files changed, 7 insertions, 4 deletions

diff --git a/client/shaders/object_shader/opengl_fragment.glsl b/client/shaders/object_shader/opengl_fragment.glsl
index 86d5c1c92..7ac182a63 100644
--- a/client/shaders/object_shader/opengl_fragment.glsl
+++ b/client/shaders/object_shader/opengl_fragment.glsl
@@ -8,6 +8,8 @@ uniform vec3 eyePosition;
 varying vec3 vNormal;
 varying vec3 vPosition;
 varying vec3 worldPosition;
+varying lowp vec4 varColor;
+varying mediump vec2 varTexCoord;
 
 varying vec3 eyeVec;
 varying float vIDiff;
@@ -15,7 +17,7 @@ varying float vIDiff;
 const float e = 2.718281828459;
 const float BS = 10.0;
 const float fogStart = FOG_START;
-const float fogShadingParameter = 1 / ( 1 - fogStart);
+const float fogShadingParameter = 1.0 / (1.0 - fogStart);
 
 #ifdef ENABLE_TONE_MAPPING
 
@@ -52,13 +54,14 @@ vec4 applyToneMapping(vec4 color)
 void main(void)
 {
 	vec3 color;
-	vec2 uv = gl_TexCoord[0].st;
+	vec2 uv = varTexCoord.st;
 
 	vec4 base = texture2D(baseTexture, uv).rgba;
 
 #ifdef USE_DISCARD
 	// If alpha is zero, we can just discard the pixel. This fixes transparency
-	// on GPUs like GC7000L, where GL_ALPHA_TEST is not implemented in mesa.
+	// on GPUs like GC7000L, where GL_ALPHA_TEST is not implemented in mesa,
+	// and also on GLES 2, where GL_ALPHA_TEST is missing entirely.
 	if (base.a == 0.0) {
 		discard;
 	}
@@ -68,7 +71,7 @@ void main(void)
 
 	vec4 col = vec4(color.rgb, base.a);
 
-	col.rgb *= gl_Color.rgb;
+	col.rgb *= varColor.rgb;
 
 	col.rgb *= emissiveColor.rgb * vIDiff;