-#ifndef __DALI_TOOLKIT_SHADER_EFFECT_MOTION_STRETCH_H__
-#define __DALI_TOOLKIT_SHADER_EFFECT_MOTION_STRETCH_H__
+#ifndef DALI_TOOLKIT_SHADER_EFFECT_MOTION_STRETCH_H
+#define DALI_TOOLKIT_SHADER_EFFECT_MOTION_STRETCH_H
/*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*/
// EXTERNAL INCLUDES
-#include <dali/public-api/actors/image-actor.h>
-#include <dali/public-api/shader-effects/shader-effect.h>
+#include <dali/public-api/actors/actor.h>
+#include <dali/public-api/animation/constraint.h>
+#include <dali/public-api/object/property-map.h>
+#include <dali/public-api/rendering/shader.h>
+
+// INTERNAL INCLUDES
+#include <dali-toolkit/public-api/visuals/visual-properties.h>
namespace Dali
{
{
/**
+ * @brief Set the properties for the motion stretch
+ */
+inline void SetMotionStretchProperties( Actor& actor )
+{
+ actor.RegisterProperty( "uGeometryStretchFactor", 0.5f );
+ actor.RegisterProperty( "uSpeedScalingFactor", 0.5f );
+ actor.RegisterProperty( "uObjectFadeStart", Vector2( 0.25f, 0.25f ) );
+ actor.RegisterProperty( "uObjectFadeEnd", Vector2( 0.5f, 0.5f ) );
+ actor.RegisterProperty( "uAlphaScale", 0.75f );
+ Property::Index uModelProperty = actor.RegisterProperty( "uModelLastFrame", Matrix::IDENTITY );
+
+ Constraint constraint = Constraint::New<Matrix>( actor, uModelProperty, EqualToConstraint() );
+ constraint.AddSource( Source( actor , Actor::Property::WORLD_MATRIX ) );
+ constraint.Apply();
+}
+
+/**
* @brief Creates a new MotionStretchEffect
*
- * Motion stretch shader works on a per object basis. Objects will stretch in the direction of motion when they move, or if the camera moves. Can be applied
- * to ImageActor or TextActor only.
- *
- * Usage example:-
- *
- * // Create shader used for doing motion stretch\n
- * ShaderEffect MotionStretchEffect = CreateMotionStretchEffect();
- *
- * // set actor shader to the stretch one\n
- * Actor actor = Actor::New( ... );\n
- * actor.SetShaderEffect( MotionStretchEffect );
- *
- * // Constrain "uModelLastFrame" to be the same as the actor's world matrix\n
- * Dali::Property::Index uModelProperty = MotionBlurEffect.GetPropertyIndex( "uModelLastFrame" );
- * Constraint constraint = Constraint::New<Matrix>( MotionBlurEffect, uModelProperty, EqualToConstraint() );\n
- * constraint.AddSource( Source( actor , Actor::Property::WORLD_MATRIX ) );\n
- * constraint.Apply();\n
+ * Motion stretch shader works on a per object basis. Objects will stretch in the direction of motion when they move, or if the camera moves.
*
* Animatable/Constrainable uniforms:
* "uGeometryStretchFactor" - This scales the amount the geometry stretches along the motion velocity vector.
* its edges. This is used to prevent an unsightly hard edge between the stretched actor and
* the scene. Depends on the values of the vertices in the vertex stream. When the actor is at
* rest this is not applied. Default Vector2(0.25, 0.25), which is half way towards the edge for
- * an ImageRenderer::QUAD.
+ * an ImageVisual::QUAD.
* "uObjectFadeEnd" - The displacement from the centre of the actor that the actor will finish fading towards its edges.
* This is used to prevent an unsightly hard edge between the stretched actor and the scene. Depends
* on the values of the vertices in the vertex stream. When the actor is at rest this is not applied.
- * Default 0.5, which is all the way towards the edge for an ImageRenderer::QUAD.
+ * Default 0.5, which is all the way towards the edge for an ImageVisual::QUAD.
* "uAlphaScale" - Global scaler applied to the alpha of the actor. Used to make the stretched actor a bit more subtle
* and reveal a bit of the background behind it as it moves. When the actor is at rest this is not
* applied. Default 0.75.
* "uModelLastFrame" - The model to world space transformation matrix of the actor in the previous frame.
*
- * @return A handle to a newly allocated ShaderEffect
+ * @return The newly created Property::Map with the motion stretch effect
*/
-inline ShaderEffect CreateMotionStretchEffect()
+inline Property::Map CreateMotionStretchEffect()
{
- // Dali vertexSource prefix for reference:
- // precision highp float;
- // attribute vec3 aPosition;
- // attribute vec2 aTexCoord;
- // uniform mat4 uMvpMatrix;
- // uniform mat4 uModelView;
- // uniform mat3 uNormalMatrix;
- // uniform mat4 uProjection;
- // uniform vec4 uColor;
- // varying vec2 vTexCoord;
std::string vertexSource;
vertexSource =
"precision mediump float;\n"
+
+ "attribute vec2 aPosition;\n"
+
+ "uniform mat4 uMvpMatrix;\n"
+ "uniform mat4 uModelView;\n"
+ "uniform mat4 uViewMatrix;\n"
+ "uniform mat4 uProjection;\n"
+ "uniform vec3 uSize;\n"
+
"uniform mat4 uModelLastFrame;\n"
- "uniform float uTimeDelta;\n"
+ "float timeDelta = 0.0167;\n"
"uniform float uGeometryStretchFactor;\n"
"uniform float uSpeedScalingFactor;\n"
"varying vec2 vModelSpaceCenterToPos;\n"
"varying vec2 vScreenSpaceVelocityVector;\n"
"varying float vSpeed;\n"
+ "varying vec2 vTexCoord;\n"
"void main()\n"
"{\n"
// get view space position of vertex this frame and last frame
- " vec4 vertex = vec4(aPosition, 1.0);\n"
- " vec4 viewSpaceVertex = uModelView * vertex;\n"
- " vec4 viewSpaceVertexLastFrame = uViewMatrix * uModelLastFrame * vertex;\n"
+ " vec4 vertexPosition = vec4(aPosition, 0.0, 1.0);\n"
+ " vertexPosition.xyz *= uSize;\n"
+
+ " vec4 viewSpaceVertex = uModelView * vertexPosition;\n"
+ " vec4 viewSpaceVertexLastFrame = uViewMatrix * uModelLastFrame * vertexPosition;\n"
// work out vertex's last movement in view space
" vec3 viewSpacePosDelta = viewSpaceVertex.xyz - viewSpaceVertexLastFrame.xyz;\n"
- " float reciprocalTimeDelta = 1.0 / ((uTimeDelta > 0.0) ? uTimeDelta : 0.01);\n"
+ " float reciprocalTimeDelta = 1.0 / timeDelta;\n"
// get clip space position of vertex this frame and last frame
- " vec4 clipSpaceVertex = uMvpMatrix * vertex;\n"
+ " vec4 clipSpaceVertex = uMvpMatrix * vertexPosition;\n"
" vec4 clipSpaceVertexLastFrame = uProjection * viewSpaceVertexLastFrame;\n"
// decide how much this vertex is 'trailing', i.e. at the back of the object relative to its direction of motion. We do this
" float posDeltaLength = length(viewSpacePosDelta);\n"
" if(posDeltaLength > 0.001)\n" // avoid div by 0 if object has barely moved
" {\n"
- " vec4 viewSpaceCenterToPos = uModelView * vec4(aPosition, 0.0);\n"
+ " vec4 viewSpaceCenterToPos = uModelView * vec4(aPosition, 0.0, 0.0);\n"
" float centerToVertexDist = length(viewSpaceCenterToPos);\n"
" if(centerToVertexDist > 0.001)\n" // avoid div by 0 if object has vertex at model space origin
" {\n"
" vSpeed = clamp(vSpeed, 0.0, 1.0);\n"
// provide fragment shader with vector from center of object to pixel (assumes the objects model space origin is at its center and verts have same z)
- " vModelSpaceCenterToPos = aPosition.xy;\n"
+ " vModelSpaceCenterToPos = viewSpaceVertex.xy;\n"
- " vTexCoord = aTexCoord;\n"
+ " vec2 texCoord = aPosition + vec2(0.5);"
+ " vTexCoord = texCoord;\n"
"}\n";
-
- // Dali fragmentSource prefix for reference:
- // precision highp float;
- // uniform sampler2D sTexture;
- // uniform sampler2D sEffect;
- // uniform vec4 uColor;
- // varying vec2 vTexCoord;
std::string fragmentSource;
fragmentSource =
"precision mediump float;\n"
+ "uniform sampler2D sTexture;\n"
+ "uniform vec4 uColor;\n"
+
"uniform vec2 uObjectFadeStart;\n"
"uniform vec2 uObjectFadeEnd;\n"
"uniform float uAlphaScale;\n"
"varying vec2 vModelSpaceCenterToPos;\n"
"varying vec2 vScreenSpaceVelocityVector;\n"
"varying float vSpeed;\n"
+ "varying vec2 vTexCoord;\n"
"void main()\n"
"{\n"
" gl_FragColor *= uColor;\n"
"}";
- // NOTE: we must turn on alpha blending for the actor (HINT_BLENDING)
- ShaderEffect shaderEffect = ShaderEffect::New(
- vertexSource, fragmentSource,
- ShaderEffect::GeometryHints( ShaderEffect::HINT_BLENDING | ShaderEffect::HINT_GRID ) );
+ Property::Map map;
+
+ Property::Map customShader;
+ customShader[ Visual::Shader::Property::VERTEX_SHADER ] = vertexSource;
+ customShader[ Visual::Shader::Property::FRAGMENT_SHADER ] = fragmentSource;
+ customShader[ Visual::Shader::Property::SUBDIVIDE_GRID_X ] = 10;
+ customShader[ Visual::Shader::Property::SUBDIVIDE_GRID_Y ] = 10;
- //////////////////////////////////////
- // Register uniform properties
- //
- //
- shaderEffect.SetUniform( "uGeometryStretchFactor", 0.5f );
- shaderEffect.SetUniform( "uSpeedScalingFactor", 0.5f );
- shaderEffect.SetUniform( "uObjectFadeStart", Vector2( 0.25f, 0.25f ) );
- shaderEffect.SetUniform( "uObjectFadeEnd", Vector2( 0.5f, 0.5f ) );
- shaderEffect.SetUniform( "uAlphaScale", 0.75f );
- shaderEffect.SetUniform( "uModelLastFrame", Matrix::IDENTITY );
+ customShader[ Visual::Shader::Property::HINTS ] = Shader::Hint::OUTPUT_IS_TRANSPARENT;
- return shaderEffect;
+ map[ Toolkit::Visual::Property::SHADER ] = customShader;
+ return map;
}
}
}
-#endif //#ifndef __DALI_TOOLKIT_SHADER_EFFECT_MOTION_STRETCH_H__
+#endif // DALI_TOOLKIT_SHADER_EFFECT_MOTION_STRETCH_H