Sync v3 pr20107 & fix builtin shaders, see: cocos2d/cocos2d-x#20107

Author: halx99

cocos/renderer/backend/opengl/ProgramGL.cpp

@@ -1,5 +1,6 @@
 /****************************************************************************
  Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
+ Copyright (c) 2020 c4games.com.
 
  http://www.cocos2d-x.org
 
@@ -32,18 +33,18 @@
 #include "renderer/backend/opengl/UtilsGL.h"
 
 CC_BACKEND_BEGIN
+
 namespace {
-    std::string vsPreDefine("#version 100\n precision highp float;\n precision highp int;\n");
-    std::string fsPreDefine("precision mediump float;\n precision mediump int;\n");
+    static const std::string SHADER_PREDEFINE = "#version 100\n precision highp float;\n precision highp int;\n";
 }
 
 ProgramGL::ProgramGL(const std::string& vertexShader, const std::string& fragmentShader)
 : Program(vertexShader, fragmentShader)
 {
 #if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID
-    //some device required manually specify the precision qualifiers for vertex shader.
-    _vertexShaderModule = static_cast<ShaderModuleGL*>(ShaderCache::newVertexShaderModule(std::move(vsPreDefine + _vertexShader)));
-    _fragmentShaderModule = static_cast<ShaderModuleGL*>(ShaderCache::newFragmentShaderModule(std::move(fsPreDefine +  _fragmentShader)));
+    // some device required manually specify the precision qualifiers for vertex shader.
+    _vertexShaderModule = static_cast<ShaderModuleGL*>(ShaderCache::newVertexShaderModule(std::move(SHADER_PREDEFINE + _vertexShader)));
+    _fragmentShaderModule = static_cast<ShaderModuleGL*>(ShaderCache::newFragmentShaderModule(std::move(SHADER_PREDEFINE + _fragmentShader)));
 #else
     _vertexShaderModule = static_cast<ShaderModuleGL*>(ShaderCache::newVertexShaderModule(_vertexShader));
     _fragmentShaderModule = static_cast<ShaderModuleGL*>(ShaderCache::newFragmentShaderModule(_fragmentShader));
@@ -88,8 +89,8 @@ void ProgramGL::reloadProgram()
     _activeUniformInfos.clear();
     _mapToCurrentActiveLocation.clear();
     _mapToOriginalLocation.clear();
-    static_cast<ShaderModuleGL*>(_vertexShaderModule)->compileShader(backend::ShaderStage::VERTEX, std::move(vsPreDefine + _vertexShader));
-    static_cast<ShaderModuleGL*>(_fragmentShaderModule)->compileShader(backend::ShaderStage::FRAGMENT, std::move(fsPreDefine + _fragmentShader));
+    static_cast<ShaderModuleGL*>(_vertexShaderModule)->compileShader(backend::ShaderStage::VERTEX, std::move(SHADER_PREDEFINE + _vertexShader));
+    static_cast<ShaderModuleGL*>(_fragmentShaderModule)->compileShader(backend::ShaderStage::FRAGMENT, std::move(SHADER_PREDEFINE + _fragmentShader));
     compileProgram();
     computeUniformInfos();
 

cocos/renderer/shaders/positionTexture.frag

@@ -26,10 +26,10 @@
 const char* positionTexture_frag = R"(
 
 #ifdef GL_ES
-precision lowp float;
-#endif
-
+varying mediump vec2 v_texCoord;
+#else
 varying vec2 v_texCoord;
+#endif
 
 uniform sampler2D u_texture;
 

cocos/renderer/shaders/positionTextureColor.frag

@@ -25,11 +25,12 @@
 
 const char* positionTextureColor_frag = R"(
 #ifdef GL_ES
-precision lowp float;
-#endif
-
+varying lowp vec4 v_fragmentColor;
+varying mediump vec2 v_texCoord;
+#else
 varying vec4 v_fragmentColor;
 varying vec2 v_texCoord;
+#endif
 
 uniform sampler2D u_texture;
 

cocos/renderer/shaders/positionTextureUColor.frag

@@ -24,18 +24,17 @@
  */
 
 const char* positionTextureUColor_frag = R"(
-
 #ifdef GL_ES
-precision lowp float;
+varying mediump vec2 v_texCoord;
+#else
+varying vec2 v_texCoord;
 #endif
 
 uniform vec4 u_color;
-uinform sampler2D u_texture;
-
-varying vec2 v_texCoord;
+uniform sampler2D u_texture;
 
 void main()
 {
-    gl_FragColor =  texture2D(u_texture, v_texCoord) * u_color;
+    gl_FragColor =  u_color * texture2D(u_texture, v_texCoord);
 }
 )";