1 files changed, 18 insertions, 9 deletions
diff --git a/themes/src/shaders/sun_vert.cpp b/themes/src/shaders/sun_vert.cpp
index ca617c0..bacf3a6 100644
--- a/themes/src/shaders/sun_vert.cpp
+++ b/themes/src/shaders/sun_vert.cpp
@@ -1,16 +1,25 @@
 #include "sun_vert.h"
 
 const char* shader_sun_vert = " \n"
-"attribute vec2 position;  \n"
-"attribute vec4 color;  \n"
-"attribute mat4 vMatrix;  \n"
-"uniform mat4 projection;  \n"
-"uniform mat4 model;  \n"
+"attribute vec2 position; \n"
+"attribute vec4 color; \n"
+"attribute mat4 vMatrix; \n"
+"uniform mat4 projection; \n"
+"uniform mat4 model; \n"
 "varying lowp vec4 VertexColor; \n"
+"varying lowp vec2 TexCoord; \n"
 " \n"
-"void main() {  \n"
-"    vec4 fragmentPosition = projection * model * vMatrix * vec4(position.x, position.y, 0, 1);  \n"
-"    gl_Position = fragmentPosition;  \n"
-"    VertexColor = color;  \n"
+"void main() { \n"
+"    vec4 fragmentPosition = projection * model * vMatrix * vec4(position.x, position.y, 0, 1); \n"
+"    gl_Position = fragmentPosition; \n"
+"    VertexColor = color; \n"
+"    // Normalize the position - the center is at (0,0) and edge vertices are at distance 'radius' \n"
+"    // We want TexCoord to be in the range roughly [-1, 1] at the edges \n"
+"    lowp float maxDist = length(position); \n"
+"    if (maxDist > 0.1) { \n"
+"        TexCoord = position / maxDist; \n"
+"    } else { \n"
+"        TexCoord = vec2(0.0, 0.0); \n"
+"    } \n"
 "} \n"
 " \n";