/****************************************************************************

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

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//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#ifndef QGL_ENGINE_SHADER_SOURCE_H

#define QGL_ENGINE_SHADER_SOURCE_H

#include "qglengineshadermanager_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(OpenGL)

static const char* const qglslMainVertexShader = "\

    uniform   highp float   depth;\

    void setPosition();\

    void main(void)\

    {\

            setPosition();\

            gl_Position.z = depth * gl_Position.w;\

    }";

static const char* const qglslMainWithTexCoordsVertexShader = "\

    attribute highp  vec2 textureCoordArray; \

    varying   highp  vec2 textureCoords; \

    uniform   highp float   depth;\

    void setPosition();\

    void main(void) \

    {\

            setPosition();\

            gl_Position.z = depth * gl_Position.w;\

            textureCoords = textureCoordArray; \

    }";

static const char* const qglslMainWithTexCoordsAndOpacityVertexShader = "\

    attribute highp vec2  textureCoordArray; \

    attribute lowp  float opacityArray; \

    varying   highp vec2  textureCoords; \

    varying   lowp  float opacity; \

    uniform   highp float depth; \

    void setPosition(); \

    void main(void) \

    { \

            setPosition(); \

            gl_Position.z = depth * gl_Position.w; \

            textureCoords = textureCoordArray; \

            opacity = opacityArray; \

    }";

static const char* const qglslPositionOnlyVertexShader = "\

    attribute highp vec4    vertexCoordsArray;\

    uniform   highp mat4    pmvMatrix;\

    void setPosition(void)\

    {\

            gl_Position = pmvMatrix * vertexCoordsArray;\

    }";

static const char* const qglslUntransformedPositionVertexShader = "\

    attribute highp vec4    vertexCoordsArray;\

    void setPosition(void)\

    {\

            gl_Position = vertexCoordsArray;\

    }";

// Pattern Brush - This assumes the texture size is 8x8 and thus, the inverted size is 0.125

static const char* const qglslPositionWithPatternBrushVertexShader = "\

    attribute highp   vec4  vertexCoordsArray; \

    uniform   highp   mat4  pmvMatrix; \

    uniform   mediump vec2  halfViewportSize; \

    uniform   highp   vec2  invertedTextureSize; \

    uniform   highp   mat3  brushTransform; \

    varying   highp   vec2  patternTexCoords; \

    void setPosition(void) { \

            gl_Position = pmvMatrix * vertexCoordsArray;\

            gl_Position.xy = gl_Position.xy / gl_Position.w; \

            mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \

            mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \

            mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \

            gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \

            gl_Position.w = invertedHTexCoordsZ; \

            patternTexCoords.xy = (hTexCoords.xy * 0.125) * invertedHTexCoordsZ; \

    }";

static const char* const qglslAffinePositionWithPatternBrushVertexShader

                 = qglslPositionWithPatternBrushVertexShader;

static const char* const qglslPatternBrushSrcFragmentShader = "\

    uniform lowp    sampler2D brushTexture;\

    uniform lowp    vec4      patternColor; \

    varying highp   vec2      patternTexCoords;\

    lowp vec4 srcPixel() { \

        return patternColor * (1.0 - texture2D(brushTexture, patternTexCoords).r); \

    }\n";

// Linear Gradient Brush

static const char* const qglslPositionWithLinearGradientBrushVertexShader = "\

    attribute highp   vec4  vertexCoordsArray; \

    uniform   highp   mat4  pmvMatrix; \

    uniform   mediump vec2  halfViewportSize; \

    uniform   highp   vec3  linearData; \

    uniform   highp   mat3  brushTransform; \

    varying   mediump float index; \

    void setPosition() { \

        gl_Position = pmvMatrix * vertexCoordsArray;\

        gl_Position.xy = gl_Position.xy / gl_Position.w; \

        mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \

        mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \

        mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \

        gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \

        gl_Position.w = invertedHTexCoordsZ; \

        index = (dot(linearData.xy, hTexCoords.xy) * linearData.z) * invertedHTexCoordsZ; \

    }";

static const char* const qglslAffinePositionWithLinearGradientBrushVertexShader

                 = qglslPositionWithLinearGradientBrushVertexShader;

static const char* const qglslLinearGradientBrushSrcFragmentShader = "\

    uniform lowp    sampler2D   brushTexture; \

    varying mediump float       index; \

    lowp vec4 srcPixel() { \

        mediump vec2 val = vec2(index, 0.5); \

        return texture2D(brushTexture, val); \

    }\n";

// Conical Gradient Brush

static const char* const qglslPositionWithConicalGradientBrushVertexShader = "\

    attribute highp   vec4  vertexCoordsArray;\

    uniform   highp   mat4  pmvMatrix;\

    uniform   mediump vec2  halfViewportSize; \

    uniform   highp   mat3  brushTransform; \

    varying   highp   vec2  A; \

    void setPosition(void)\

    {\

        gl_Position = pmvMatrix * vertexCoordsArray;\

        gl_Position.xy = gl_Position.xy / gl_Position.w; \

        mediump vec2  viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \

        mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \

        mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \

        gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \

        gl_Position.w = invertedHTexCoordsZ; \

        A = hTexCoords.xy * invertedHTexCoordsZ; \

    }";

static const char* const qglslAffinePositionWithConicalGradientBrushVertexShader

                 = qglslPositionWithConicalGradientBrushVertexShader;

static const char* const qglslConicalGradientBrushSrcFragmentShader = "\n\

    #define INVERSE_2PI 0.1591549430918953358 \n\

    uniform lowp    sampler2D   brushTexture; \n\

    uniform mediump float       angle; \

    varying highp   vec2        A; \

    lowp vec4 srcPixel() { \

        highp float t; \

        if (abs(A.y) == abs(A.x)) \

            t = (atan(-A.y + 0.002, A.x) + angle) * INVERSE_2PI; \

        else \

            t = (atan(-A.y, A.x) + angle) * INVERSE_2PI; \

        return texture2D(brushTexture, vec2(t - floor(t), 0.5)); \

    }";

// Radial Gradient Brush

static const char* const qglslPositionWithRadialGradientBrushVertexShader = "\

    attribute highp   vec4 vertexCoordsArray;\

    uniform   highp   mat4 pmvMatrix;\

    uniform   mediump vec2 halfViewportSize; \

    uniform   highp   mat3 brushTransform; \

    uniform   highp   vec2 fmp; \

    varying   highp   float b; \

    varying   highp   vec2  A; \

    void setPosition(void) \

    {\

        gl_Position = pmvMatrix * vertexCoordsArray;\

        gl_Position.xy = gl_Position.xy / gl_Position.w; \

        mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \

        mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \

        mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \

        gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \

        gl_Position.w = invertedHTexCoordsZ; \

        A = hTexCoords.xy * invertedHTexCoordsZ; \

        b = 2.0 * dot(A, fmp); \

    }";

static const char* const qglslAffinePositionWithRadialGradientBrushVertexShader

                 = qglslPositionWithRadialGradientBrushVertexShader;

static const char* const qglslRadialGradientBrushSrcFragmentShader = "\

    uniform lowp    sampler2D   brushTexture; \

    uniform highp   float       fmp2_m_radius2; \

    uniform highp   float       inverse_2_fmp2_m_radius2; \

    varying highp   float       b; \

    varying highp   vec2        A; \

    lowp vec4 srcPixel() { \

        highp float c = -dot(A, A); \

        highp vec2 val = vec2((-b + sqrt(b*b - 4.0*fmp2_m_radius2*c)) * inverse_2_fmp2_m_radius2, 0.5); \

        return texture2D(brushTexture, val); \

    }";

// Texture Brush

static const char* const qglslPositionWithTextureBrushVertexShader = "\

    attribute highp   vec4  vertexCoordsArray; \

    uniform   highp   mat4  pmvMatrix; \

    uniform   mediump vec2  halfViewportSize; \

    uniform   highp   vec2  invertedTextureSize; \

    uniform   highp   mat3  brushTransform; \

    void setPosition(void) { \

            gl_Position = pmvMatrix * vertexCoordsArray;\

            gl_Position.xy = gl_Position.xy / gl_Position.w; \

            mediump vec2 viewportCoords = (gl_Position.xy + 1.0) * halfViewportSize; \

            mediump vec3 hTexCoords = brushTransform * vec3(viewportCoords, 1); \

            mediump float invertedHTexCoordsZ = 1.0 / hTexCoords.z; \

            gl_Position.xy = gl_Position.xy * invertedHTexCoordsZ; \

            gl_Position.w = invertedHTexCoordsZ; \

    }";

static const char* const qglslAffinePositionWithTextureBrushVertexShader

                 = qglslPositionWithTextureBrushVertexShader;

#if defined(QT_OPENGL_ES_2)

// OpenGL ES does not support GL_REPEAT wrap modes for NPOT textures. So instead,

// we emulate GL_REPEAT by only taking the fractional part of the texture coords.

// TODO: Special case POT textures which don't need this emulation

static const char* const qglslTextureBrushSrcFragmentShader = "\

    uniform lowp    sampler2D brushTexture; \

    lowp vec4 srcPixel() { \

    }";

#else

static const char* const qglslTextureBrushSrcFragmentShader = "\

    uniform lowp    sampler2D brushTexture; \

    lowp vec4 srcPixel() { \

    }";

#endif

static const char* const qglslTextureBrushSrcWithPatternFragmentShader = "\

    uniform lowp    vec4      patternColor; \

    uniform lowp    sampler2D brushTexture; \

    lowp vec4 srcPixel() { \

    }";

// Solid Fill Brush

static const char* const qglslSolidBrushSrcFragmentShader = "\

    uniform lowp vec4 fragmentColor; \

    lowp vec4 srcPixel() { \

        return fragmentColor; \

    }";

static const char* const qglslImageSrcFragmentShader = "\

    varying highp   vec2    textureCoords; \

    uniform lowp  sampler2D imageTexture; \

    lowp vec4 srcPixel() { \

        return texture2D(imageTexture, textureCoords); \

    }";

static const char* const qglslCustomSrcFragmentShader = "\

    varying highp vec2      textureCoords; \

    uniform lowp  sampler2D imageTexture; \

    lowp vec4 customShader(lowp sampler2D texture, highp vec2 coords); \

    lowp vec4 srcPixel() { \

        return customShader(imageTexture, textureCoords); \

    }";

static const char* const qglslImageSrcWithPatternFragmentShader = "\

    varying highp vec2      textureCoords; \

    uniform lowp  vec4      patternColor; \

    uniform lowp  sampler2D imageTexture; \

    lowp vec4 srcPixel() { \

        return patternColor * (1.0 - texture2D(imageTexture, textureCoords).r); \

    }\n";

static const char* const qglslNonPremultipliedImageSrcFragmentShader = "\

    varying highp vec2      textureCoords; \

    uniform lowp  sampler2D imageTexture; \

    lowp vec4 srcPixel() { \

        lowp vec4 sample = texture2D(imageTexture, textureCoords); \

        sample.rgb = sample.rgb * sample.a; \

        return sample; \

    }";

static const char* const qglslShockingPinkSrcFragmentShader = "\

    lowp vec4 srcPixel() { \

        return vec4(0.98, 0.06, 0.75, 1.0); \

    }";

static const char* const qglslMainFragmentShader_ImageArrays = "\

    varying lowp float opacity; \

    lowp vec4 srcPixel(); \

    void main() { \

        gl_FragColor = srcPixel() * opacity; \

    }";

static const char* const qglslMainFragmentShader_CMO = "\

    uniform lowp float globalOpacity; \

    lowp vec4 srcPixel(); \

    lowp vec4 applyMask(lowp vec4); \

    lowp vec4 compose(lowp vec4); \

    void main() { \

        gl_FragColor = applyMask(compose(srcPixel()*globalOpacity))); \

    }";

static const char* const qglslMainFragmentShader_CM = "\

    lowp vec4 srcPixel(); \

    lowp vec4 applyMask(lowp vec4); \

    lowp vec4 compose(lowp vec4); \

    void main() { \

        gl_FragColor = applyMask(compose(srcPixel())); \

    }";

static const char* const qglslMainFragmentShader_MO = "\

    uniform lowp float globalOpacity; \

    lowp vec4 srcPixel(); \

    lowp vec4 applyMask(lowp vec4); \

    void main() { \

        gl_FragColor = applyMask(srcPixel()*globalOpacity); \

    }";

static const char* const qglslMainFragmentShader_M = "\

    lowp vec4 srcPixel(); \

    lowp vec4 applyMask(lowp vec4); \

    void main() { \

        gl_FragColor = applyMask(srcPixel()); \

    }";

static const char* const qglslMainFragmentShader_CO = "\

    uniform lowp float globalOpacity; \

    lowp vec4 srcPixel(); \

    lowp vec4 compose(lowp vec4); \

    void main() { \

        gl_FragColor = compose(srcPixel()*globalOpacity); \

    }";

static const char* const qglslMainFragmentShader_C = "\

    lowp vec4 srcPixel(); \

    lowp vec4 compose(lowp vec4); \

    void main() { \

        gl_FragColor = compose(srcPixel()); \

    }";

static const char* const qglslMainFragmentShader_O = "\

    uniform lowp float globalOpacity; \

    lowp vec4 srcPixel(); \

    void main() { \

        gl_FragColor = srcPixel()*globalOpacity; \

    }";

static const char* const qglslMainFragmentShader = "\

    lowp vec4 srcPixel(); \

    void main() { \

        gl_FragColor = srcPixel(); \

    }";

static const char* const qglslMaskFragmentShader = "\

    varying highp   vec2      textureCoords;\

    uniform lowp    sampler2D maskTexture;\

    lowp vec4 applyMask(lowp vec4 src) \

    {\

        lowp vec4 mask = texture2D(maskTexture, textureCoords); \

        return src * mask.a; \

    }";

// For source over with subpixel antialiasing, the final color is calculated per component as follows

// (.a is alpha component, .c is red, green or blue component):

// alpha = src.a * mask.c * opacity

// dest.c = dest.c * (1 - alpha) + src.c * alpha

//

// In the first pass, calculate: dest.c = dest.c * (1 - alpha) with blend funcs: zero, 1 - source color

// In the second pass, calculate: dest.c = dest.c + src.c * alpha with blend funcs: one, one

//

// If source is a solid color (src is constant), only the first pass is needed, with blend funcs: constant, 1 - source color

// For source composition with subpixel antialiasing, the final color is calculated per component as follows:

// alpha = src.a * mask.c * opacity

// dest.c = dest.c * (1 - mask.c) + src.c * alpha

//

static const char* const qglslRgbMaskFragmentShaderPass1 = "\

    varying highp   vec2      textureCoords;\

    uniform lowp    sampler2D maskTexture;\

    lowp vec4 applyMask(lowp vec4 src) \

    {\

        lowp vec4 mask = texture2D(maskTexture, textureCoords); \

        return src.a * mask; \

    }";

static const char* const qglslRgbMaskFragmentShaderPass2 = "\

    varying highp   vec2      textureCoords;\

    uniform lowp    sampler2D maskTexture;\

    lowp vec4 applyMask(lowp vec4 src) \

    {\

        lowp vec4 mask = texture2D(maskTexture, textureCoords); \

        return src * mask; \

    }";

/*

    Left to implement:

        RgbMaskFragmentShader,

        RgbMaskWithGammaFragmentShader,

        MultiplyCompositionModeFragmentShader,

        ScreenCompositionModeFragmentShader,

        OverlayCompositionModeFragmentShader,

        DarkenCompositionModeFragmentShader,

        LightenCompositionModeFragmentShader,

        ColorDodgeCompositionModeFragmentShader,

        ColorBurnCompositionModeFragmentShader,

        HardLightCompositionModeFragmentShader,

        SoftLightCompositionModeFragmentShader,

        DifferenceCompositionModeFragmentShader,

        ExclusionCompositionModeFragmentShader,

*/

QT_END_NAMESPACE

QT_END_HEADER

#endif // GLGC_SHADER_SOURCE_H