[Impeller] Increase precision of texture coordinate input (#40803)

[Impeller] Increase precision of texture coordinate input

Author: jonahwilliams

impeller/compiler/shader_lib/impeller/texture.glsl

@@ -100,13 +100,11 @@ const float16_t kTileModeDecalHf = 3.0hf;
 /// This is useful for Impeller graphics backend that don't have native support
 /// for Decal.
 f16vec4 IPHalfSampleWithTileMode(f16sampler2D tex,
-                                 f16vec2 coords,
+                                 vec2 coords,
                                  float16_t x_tile_mode,
                                  float16_t y_tile_mode) {
-  if (x_tile_mode == kTileModeDecalHf &&
-          (coords.x < 0.0hf || coords.x >= 1.0hf) ||
-      y_tile_mode == kTileModeDecalHf &&
-          (coords.y < 0.0hf || coords.y >= 1.0hf)) {
+  if (x_tile_mode == kTileModeDecalHf && (coords.x < 0.0 || coords.x >= 1.0) ||
+      y_tile_mode == kTileModeDecalHf && (coords.y < 0.0 || coords.y >= 1.0)) {
     return f16vec4(0.0hf);
   }
 

impeller/entity/shaders/texture_fill.frag

@@ -11,7 +11,7 @@ uniform FragInfo {
 }
 frag_info;
 
-in f16vec2 v_texture_coords;
+in highp vec2 v_texture_coords;
 
 out f16vec4 frag_color;
 

impeller/entity/shaders/texture_fill.vert

@@ -11,13 +11,13 @@ uniform FrameInfo {
 }
 frame_info;
 
-in vec2 position;
+in highp vec2 position;
 in vec2 texture_coords;
 
-out f16vec2 v_texture_coords;
+out highp vec2 v_texture_coords;
 
 void main() {
   gl_Position = frame_info.mvp * vec4(position, 0.0, 1.0);
-  v_texture_coords = f16vec2(
-      IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale));
+  v_texture_coords =
+      IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale);
 }

impeller/entity/shaders/tiled_texture_fill.frag

@@ -14,7 +14,7 @@ uniform FragInfo {
 }
 frag_info;
 
-in f16vec2 v_texture_coords;
+in highp vec2 v_texture_coords;
 
 out f16vec4 frag_color;
 

impeller/entity/shaders/tiled_texture_fill.vert

@@ -11,13 +11,13 @@ uniform FrameInfo {
 }
 frame_info;
 
-in vec2 position;
-in vec2 texture_coords;
+in highp vec2 position;
+in highp vec2 texture_coords;
 
-out f16vec2 v_texture_coords;
+out highp vec2 v_texture_coords;
 
 void main() {
   gl_Position = frame_info.mvp * vec4(position, 0.0, 1.0);
-  v_texture_coords = f16vec2(
-      IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale));
+  v_texture_coords =
+      IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale);
 }