Shaders for Android (GLES 2) (#10506)

Shader support for OpenGL ES 2 devices (Android)

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

2 files changed, 20 insertions, 16 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;
 
diff --git a/client/shaders/object_shader/opengl_vertex.glsl b/client/shaders/object_shader/opengl_vertex.glsl
index f8c1cd932..e44984dc8 100644
--- a/client/shaders/object_shader/opengl_vertex.glsl
+++ b/client/shaders/object_shader/opengl_vertex.glsl
@@ -1,4 +1,3 @@
-uniform mat4 mWorldViewProj;
 uniform mat4 mWorld;
 
 uniform vec3 eyePosition;
@@ -7,6 +6,8 @@ uniform float animationTimer;
 varying vec3 vNormal;
 varying vec3 vPosition;
 varying vec3 worldPosition;
+varying lowp vec4 varColor;
+varying mediump vec2 varTexCoord;
 
 varying vec3 eyeVec;
 varying float vIDiff;
@@ -18,31 +19,31 @@ float directional_ambient(vec3 normal)
 {
 	vec3 v = normal * normal;
 
-	if (normal.y < 0)
-		return dot(v, vec3(0.670820f, 0.447213f, 0.836660f));
+	if (normal.y < 0.0)
+		return dot(v, vec3(0.670820, 0.447213, 0.836660));
 
-	return dot(v, vec3(0.670820f, 1.000000f, 0.836660f));
+	return dot(v, vec3(0.670820, 1.000000, 0.836660));
 }
 
 void main(void)
 {
-	gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
-	gl_Position = mWorldViewProj * gl_Vertex;
+	varTexCoord = (mTexture * inTexCoord0).st;
+	gl_Position = mWorldViewProj * inVertexPosition;
 
 	vPosition = gl_Position.xyz;
-	vNormal = gl_Normal;
-	worldPosition = (mWorld * gl_Vertex).xyz;
-	eyeVec = -(gl_ModelViewMatrix * gl_Vertex).xyz;
+	vNormal = inVertexNormal;
+	worldPosition = (mWorld * inVertexPosition).xyz;
+	eyeVec = -(mWorldView * inVertexPosition).xyz;
 
 #if (MATERIAL_TYPE == TILE_MATERIAL_PLAIN) || (MATERIAL_TYPE == TILE_MATERIAL_PLAIN_ALPHA)
 	vIDiff = 1.0;
 #else
 	// This is intentional comparison with zero without any margin.
 	// If normal is not equal to zero exactly, then we assume it's a valid, just not normalized vector
-	vIDiff = length(gl_Normal) == 0.0
+	vIDiff = length(inVertexNormal) == 0.0
 		? 1.0
-		: directional_ambient(normalize(gl_Normal));
+		: directional_ambient(normalize(inVertexNormal));
 #endif
 
-	gl_FrontColor = gl_BackColor = gl_Color;
+	varColor = inVertexColor;
 }