[Impeller] opt float/sampler into relaxed precision for gles (flutter/engine#37828)

* [Impeller] opt float/sampler into relaxed precision for gles

* re-arrange define

engine/src/flutter/impeller/compiler/shader_lib/impeller/types.glsl

@@ -5,6 +5,21 @@
 #ifndef TYPES_GLSL_
 #define TYPES_GLSL_
 
+#extension GL_AMD_gpu_shader_half_float : enable
+
+#ifndef IMPELLER_TARGET_METAL
+
+precision mediump sampler2D;
+precision mediump float;
+
+#define float16_t float
+#define f16vec2 vec2
+#define f16vec3 vec3
+#define f16vec4 vec4
+#define f16mat4 mat4
+
+#endif  // IMPELLER_TARGET_METAL
+
 #define BoolF float
 #define BoolV2 vec2
 #define BoolV3 vec3

engine/src/flutter/impeller/entity/shaders/atlas_fill.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 

engine/src/flutter/impeller/entity/shaders/atlas_fill.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform VertInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/blending/advanced_blend.glsl

@@ -5,6 +5,7 @@
 #include <impeller/blending.glsl>
 #include <impeller/color.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform BlendInfo {
   float dst_input_alpha;

engine/src/flutter/impeller/entity/shaders/blending/advanced_blend.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/blending/blend.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler_src;
 

engine/src/flutter/impeller/entity/shaders/blending/blend.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/border_mask_blur.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/gaussian.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 // Constant time mask blur for image borders.
 //

engine/src/flutter/impeller/entity/shaders/border_mask_blur.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 

engine/src/flutter/impeller/entity/shaders/color_matrix_color_filter.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/color.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 // A color filter that transforms colors through a 4x5 color matrix.
 //

engine/src/flutter/impeller/entity/shaders/color_matrix_color_filter.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/gaussian_blur.frag

@@ -16,6 +16,7 @@
 #include <impeller/constants.glsl>
 #include <impeller/gaussian.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 uniform sampler2D alpha_mask_sampler;

engine/src/flutter/impeller/entity/shaders/gaussian_blur.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/glyph_atlas.frag

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform sampler2D glyph_atlas_sampler;
 
 uniform FragInfo {

engine/src/flutter/impeller/entity/shaders/glyph_atlas.vert

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/transform.glsl>
+#include <impeller/types.glsl>
 
 uniform FrameInfo {
   mat4 mvp;

engine/src/flutter/impeller/entity/shaders/glyph_atlas_sdf.frag

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform sampler2D glyph_atlas_sampler;
 
 uniform FragInfo {

engine/src/flutter/impeller/entity/shaders/glyph_atlas_sdf.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 #include <impeller/transform.glsl>
 
 uniform FrameInfo {

engine/src/flutter/impeller/entity/shaders/gradient_fill.vert

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/transform.glsl>
+#include <impeller/types.glsl>
 
 uniform FrameInfo {
   mat4 mvp;

engine/src/flutter/impeller/entity/shaders/linear_gradient_fill.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 

engine/src/flutter/impeller/entity/shaders/linear_gradient_ssbo_fill.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/gradient.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 readonly buffer ColorData {
   vec4 colors[];

engine/src/flutter/impeller/entity/shaders/linear_to_srgb_filter.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/color.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 // A color filter that applies the sRGB gamma curve to the color.
 //

engine/src/flutter/impeller/entity/shaders/linear_to_srgb_filter.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/morphology_filter.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/constants.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 // These values must correspond to the order of the items in the
 // 'FilterContents::MorphType' enum class.

engine/src/flutter/impeller/entity/shaders/morphology_filter.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/position.vert

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/transform.glsl>
+#include <impeller/types.glsl>
 
 uniform VertInfo {
   mat4 mvp;

engine/src/flutter/impeller/entity/shaders/position_color.vert

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/transform.glsl>
+#include <impeller/types.glsl>
 
 uniform VertInfo {
   mat4 mvp;

engine/src/flutter/impeller/entity/shaders/position_uv.vert

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/transform.glsl>
+#include <impeller/types.glsl>
 
 uniform VertInfo {
   mat4 mvp;

engine/src/flutter/impeller/entity/shaders/radial_gradient_fill.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 

engine/src/flutter/impeller/entity/shaders/radial_gradient_ssbo_fill.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/gradient.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 readonly buffer ColorData {
   vec4 colors[];

engine/src/flutter/impeller/entity/shaders/rrect_blur.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/gaussian.glsl>
+#include <impeller/types.glsl>
 
 uniform FragInfo {
   vec4 color;

engine/src/flutter/impeller/entity/shaders/rrect_blur.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform VertInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/runtime_effect.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform VertInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/solid_fill.frag

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FragInfo {
   vec4 color;
 }

engine/src/flutter/impeller/entity/shaders/solid_fill.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform VertInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/srgb_to_linear_filter.frag

@@ -8,6 +8,8 @@
 // Creates a color filter that applies the inverse of the sRGB gamma curve
 // to the RGB channels.
 
+#include <impeller/types.glsl>
+
 uniform sampler2D input_texture;
 
 uniform FragInfo {

engine/src/flutter/impeller/entity/shaders/srgb_to_linear_filter.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/sweep_gradient_fill.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/constants.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 

engine/src/flutter/impeller/entity/shaders/sweep_gradient_ssbo_fill.frag

@@ -5,6 +5,7 @@
 #include <impeller/constants.glsl>
 #include <impeller/gradient.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 readonly buffer ColorData {
   vec4 colors[];

engine/src/flutter/impeller/entity/shaders/texture_fill.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 

engine/src/flutter/impeller/entity/shaders/texture_fill.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform VertInfo {
   mat4 mvp;
 }

engine/src/flutter/impeller/entity/shaders/tiled_texture_fill.frag

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D texture_sampler;
 

engine/src/flutter/impeller/entity/shaders/tiled_texture_fill.vert

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <impeller/transform.glsl>
+#include <impeller/types.glsl>
 
 uniform VertInfo {
   mat4 mvp;

engine/src/flutter/impeller/entity/shaders/vertices.frag

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 in vec4 v_color;
 
 out vec4 frag_color;

engine/src/flutter/impeller/entity/shaders/yuv_to_rgb_filter.frag

@@ -4,6 +4,7 @@
 
 #include <impeller/color.glsl>
 #include <impeller/texture.glsl>
+#include <impeller/types.glsl>
 
 uniform sampler2D y_texture;
 uniform sampler2D uv_texture;

engine/src/flutter/impeller/entity/shaders/yuv_to_rgb_filter.vert

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <impeller/types.glsl>
+
 uniform FrameInfo {
   mat4 mvp;
 }