зеркало из https://github.com/mozilla/moz-skia.git
Added GPU implementation of 2-point conical gradient.
Review URL: https://codereview.appspot.com/6354062 git-svn-id: http://skia.googlecode.com/svn/trunk@4442 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
rileya@google.com
Родитель
dbc5d28979
Коммит
3e33258cd1
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@ -212,8 +212,18 @@ public:
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// space
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// 2: the second radius minus the first radius
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// in pre-transformed space.
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kTwoPointConical_BitmapType,
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//<! Matrix transforms to space where (0,0) is
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// the center of the starting circle. The second
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// circle will be centered (x, 0) where x may be
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// 0.
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// Three extra parameters are returned:
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// 0: x-offset of second circle center
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// to first.
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// 1: radius of first circle
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// 2: the second radius minus the first radius
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kLast_BitmapType = kTwoPointRadial_BitmapType
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kLast_BitmapType = kTwoPointConical_BitmapType
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};
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/** Optional methods for shaders that can pretend to be a bitmap/texture
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to play along with opengl. Default just returns kNone_BitmapType and
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@ -26,7 +26,7 @@ static void draw_gradient2(SkCanvas* canvas, const SkRect& rect, SkScalar delta)
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SkPoint c1 = { l + 3 * w / 5, t + h / 2 };
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SkScalar r0 = w / 5;
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SkScalar r1 = 2 * w / 5;
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SkShader* s = SkGradientShader::CreateTwoPointRadial(c0, r0, c1, r1, colors,
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SkShader* s = SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1, colors,
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pos, SK_ARRAY_COUNT(pos),
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SkShader::kClamp_TileMode);
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SkPaint paint;
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@ -2304,6 +2304,47 @@ public:
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return true;
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}
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virtual BitmapType asABitmap(SkBitmap* bitmap,
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SkMatrix* matrix,
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TileMode* xy,
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SkScalar* twoPointRadialParams) const {
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SkPoint diff = fCenter2 - fCenter1;
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SkScalar diffRadius = fRadius2 - fRadius1;
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SkScalar startRadius = fRadius1;
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SkScalar diffLen = 0;
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if (bitmap) {
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this->commonAsABitmap(bitmap);
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}
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if (matrix || twoPointRadialParams) {
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diffLen = diff.length();
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}
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if (matrix) {
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if (diffLen) {
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SkScalar invDiffLen = SkScalarInvert(diffLen);
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// rotate to align circle centers with the x-axis
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matrix->setSinCos(-SkScalarMul(invDiffLen, diff.fY),
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SkScalarMul(invDiffLen, diff.fX));
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} else {
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matrix->reset();
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}
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matrix->preTranslate(-fCenter1.fX, -fCenter1.fY);
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}
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if (xy) {
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xy[0] = fTileMode;
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xy[1] = kClamp_TileMode;
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}
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if (NULL != twoPointRadialParams) {
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twoPointRadialParams[0] = diffLen;
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twoPointRadialParams[1] = startRadius;
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twoPointRadialParams[2] = diffRadius;
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}
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return kTwoPointConical_BitmapType;
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}
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SkShader::GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE {
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if (info) {
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commonAsAGradient(info);
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@ -411,7 +411,9 @@ SK_COMPILE_ASSERT(SkShader::kRadial_BitmapType == 2, shader_type_mismatch);
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SK_COMPILE_ASSERT(SkShader::kSweep_BitmapType == 3, shader_type_mismatch);
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SK_COMPILE_ASSERT(SkShader::kTwoPointRadial_BitmapType == 4,
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shader_type_mismatch);
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SK_COMPILE_ASSERT(SkShader::kLast_BitmapType == 4, shader_type_mismatch);
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SK_COMPILE_ASSERT(SkShader::kTwoPointConical_BitmapType == 5,
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shader_type_mismatch);
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SK_COMPILE_ASSERT(SkShader::kLast_BitmapType == 5, shader_type_mismatch);
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namespace {
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@ -545,6 +547,13 @@ inline bool skPaint2GrPaintShader(SkGpuDevice* dev,
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twoPointParams[2] < 0))->unref();
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sampler->setFilter(GrSamplerState::kBilinear_Filter);
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break;
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case SkShader::kTwoPointConical_BitmapType:
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sampler->setCustomStage(new
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GrConical2Gradient(twoPointParams[0],
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twoPointParams[1],
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twoPointParams[2]))->unref();
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sampler->setFilter(GrSamplerState::kBilinear_Filter);
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break;
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default:
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if (skPaint.isFilterBitmap()) {
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sampler->setFilter(GrSamplerState::kBilinear_Filter);
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@ -35,9 +35,9 @@ private:
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};
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void GrGLRadialGradient::emitFS(GrGLShaderBuilder* state,
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const char* outputColor,
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const char* inputColor,
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const char* samplerName) {
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const char* outputColor,
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const char* inputColor,
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const char* samplerName) {
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state->fSampleCoords.printf("vec2(length(%s.xy), 0.5)",
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state->fSampleCoords.c_str());
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state->fComplexCoord = true;
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@ -161,7 +161,7 @@ void GrGLRadial2Gradient::setupVariables(GrGLShaderBuilder* state, int stage) {
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}
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void GrGLRadial2Gradient::emitVS(GrGLShaderBuilder* state,
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const char* vertexCoords) {
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const char* vertexCoords) {
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GrStringBuilder* code = &state->fVSCode;
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GrStringBuilder p2;
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GrStringBuilder p3;
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@ -179,9 +179,9 @@ void GrGLRadial2Gradient::emitVS(GrGLShaderBuilder* state,
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}
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void GrGLRadial2Gradient::emitFS(GrGLShaderBuilder* state,
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const char* outputColor,
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const char* inputColor,
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const char* samplerName) {
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const char* outputColor,
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const char* inputColor,
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const char* samplerName) {
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GrStringBuilder* code = &state->fFSCode;
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GrStringBuilder cName("c");
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GrStringBuilder ac4Name("ac4");
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@ -259,9 +259,9 @@ void GrGLRadial2Gradient::initUniforms(const GrGLInterface* gl, int programID) {
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}
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void GrGLRadial2Gradient::setData(const GrGLInterface* gl,
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const GrGLTexture& texture,
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const GrCustomStage& baseData,
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int stageNum) {
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const GrGLTexture& texture,
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const GrCustomStage& baseData,
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int stageNum) {
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const GrRadial2Gradient& data =
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static_cast<const GrRadial2Gradient&>(baseData);
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GrAssert(data.isDegenerate() == fIsDegenerate);
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@ -323,6 +323,307 @@ bool GrRadial2Gradient::isEqual(const GrCustomStage& sBase) const {
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/////////////////////////////////////////////////////////////////////
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class GrGLConical2Gradient : public GrGLProgramStage {
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public:
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GrGLConical2Gradient(const GrProgramStageFactory& factory,
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const GrCustomStage&);
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virtual ~GrGLConical2Gradient() { }
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virtual void setupVariables(GrGLShaderBuilder* state,
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int stage) SK_OVERRIDE;
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virtual void emitVS(GrGLShaderBuilder* state,
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const char* vertexCoords) SK_OVERRIDE;
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virtual void emitFS(GrGLShaderBuilder* state,
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const char* outputColor,
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const char* inputColor,
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const char* samplerName) SK_OVERRIDE;
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virtual void initUniforms(const GrGLInterface*, int programID) SK_OVERRIDE;
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virtual void setData(const GrGLInterface*,
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const GrGLTexture&,
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const GrCustomStage&,
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int stageNum) SK_OVERRIDE;
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static StageKey GenKey(const GrCustomStage& s) {
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return (static_cast<const GrConical2Gradient&>(s).isDegenerate());
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}
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protected:
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const GrGLShaderVar* fVSParamVar;
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GrGLint fVSParamLocation;
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const GrGLShaderVar* fFSParamVar;
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GrGLint fFSParamLocation;
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const char* fVSVaryingName;
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const char* fFSVaryingName;
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bool fIsDegenerate;
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// @{
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/// Values last uploaded as uniforms
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GrScalar fCachedCenter;
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GrScalar fCachedRadius;
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GrScalar fCachedDiffRadius;
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// @}
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private:
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typedef GrGLProgramStage INHERITED;
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};
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GrGLConical2Gradient::GrGLConical2Gradient(
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const GrProgramStageFactory& factory,
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const GrCustomStage& baseData)
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: INHERITED(factory)
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, fVSParamVar(NULL)
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, fFSParamVar(NULL)
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, fVSVaryingName(NULL)
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, fFSVaryingName(NULL)
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, fCachedCenter(GR_ScalarMax)
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, fCachedRadius(-GR_ScalarMax)
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, fCachedDiffRadius(-GR_ScalarMax) {
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const GrConical2Gradient& data =
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static_cast<const GrConical2Gradient&>(baseData);
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fIsDegenerate = data.isDegenerate();
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}
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void GrGLConical2Gradient::setupVariables(GrGLShaderBuilder* state, int stage) {
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// 2 copies of uniform array, 1 for each of vertex & fragment shader,
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// to work around Xoom bug. Doesn't seem to cause performance decrease
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// in test apps, but need to keep an eye on it.
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fVSParamVar = &state->addUniform(
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GrGLShaderBuilder::kVertex_VariableLifetime,
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kFloat_GrSLType, "uConical2VSParams", stage, 6);
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fFSParamVar = &state->addUniform(
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GrGLShaderBuilder::kFragment_VariableLifetime,
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kFloat_GrSLType, "uConical2FSParams", stage, 6);
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fVSParamLocation = GrGLProgramStage::kUseUniform;
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fFSParamLocation = GrGLProgramStage::kUseUniform;
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// For radial gradients without perspective we can pass the linear
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// part of the quadratic as a varying.
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if (state->fVaryingDims == state->fCoordDims) {
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state->addVarying(kFloat_GrSLType, "Conical2BCoeff", stage,
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&fVSVaryingName, &fFSVaryingName);
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}
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}
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void GrGLConical2Gradient::emitVS(GrGLShaderBuilder* state,
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const char* vertexCoords) {
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GrStringBuilder* code = &state->fVSCode;
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GrStringBuilder p2; // distance between centers
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GrStringBuilder p3; // start radius
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GrStringBuilder p5; // difference in radii (r1 - r0)
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fVSParamVar->appendArrayAccess(2, &p2);
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fVSParamVar->appendArrayAccess(3, &p3);
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fVSParamVar->appendArrayAccess(5, &p5);
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// For radial gradients without perspective we can pass the linear
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// part of the quadratic as a varying.
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if (state->fVaryingDims == state->fCoordDims) {
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// r2Var = -2 * (r2Parm[2] * varCoord.x - r2Param[3] * r2Param[5])
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code->appendf("\t%s = -2.0 * (%s * %s.x + %s * %s);\n",
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fVSVaryingName, p2.c_str(),
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vertexCoords, p3.c_str(), p5.c_str());
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}
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}
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void GrGLConical2Gradient::emitFS(GrGLShaderBuilder* state,
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const char* outputColor,
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const char* inputColor,
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const char* samplerName) {
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GrStringBuilder* code = &state->fFSCode;
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GrStringBuilder cName("c");
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GrStringBuilder ac4Name("ac4");
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GrStringBuilder dName("d");
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GrStringBuilder qName("q");
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GrStringBuilder r0Name("r0");
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GrStringBuilder r1Name("r1");
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GrStringBuilder tName("t");
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GrStringBuilder p0; // 4a
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GrStringBuilder p1; // 1/(2a)
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GrStringBuilder p2; // distance between centers
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GrStringBuilder p3; // start radius
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GrStringBuilder p4; // start radius squared
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GrStringBuilder p5; // difference in radii (r1 - r0)
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fFSParamVar->appendArrayAccess(0, &p0);
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fFSParamVar->appendArrayAccess(1, &p1);
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fFSParamVar->appendArrayAccess(2, &p2);
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fFSParamVar->appendArrayAccess(3, &p3);
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fFSParamVar->appendArrayAccess(4, &p4);
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fFSParamVar->appendArrayAccess(5, &p5);
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// If we we're able to interpolate the linear component,
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// bVar is the varying; otherwise compute it
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GrStringBuilder bVar;
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if (state->fCoordDims == state->fVaryingDims) {
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bVar = fFSVaryingName;
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GrAssert(2 == state->fVaryingDims);
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} else {
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GrAssert(3 == state->fVaryingDims);
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bVar = "b";
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code->appendf("\tfloat %s = -2.0 * (%s * %s.x + %s * %s);\n",
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bVar.c_str(), p2.c_str(), state->fSampleCoords.c_str(),
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p3.c_str(), p5.c_str());
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}
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// c = (x^2)+(y^2) - params[4]
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code->appendf("\tfloat %s = dot(%s, %s) - %s;\n", cName.c_str(),
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state->fSampleCoords.c_str(), state->fSampleCoords.c_str(),
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p4.c_str());
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// Non-degenerate case (quadratic)
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if (!fIsDegenerate) {
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// ac4 = params[0] * c
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code->appendf("\tfloat %s = %s * %s;\n", ac4Name.c_str(), p0.c_str(),
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cName.c_str());
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// d = b^2 - ac4
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code->appendf("\tfloat %s = %s * %s - %s;\n", dName.c_str(),
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bVar.c_str(), bVar.c_str(), ac4Name.c_str());
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// if discriminant is < 0, set to transparent black and return
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code->appendf("\tif (%s < 0.0) {\n\t\tgl_FragColor = vec4(0.0,0.0,0.0,"
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"0.0);\n\t\treturn;\n\t}\n", dName.c_str());
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// intermediate value we'll use to compute the roots
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// q = -0.5 * (b +/- sqrt(d))
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code->appendf("\tfloat %s = -0.5f * (%s + (%s < 0.0 ? -1.0 : 1.0)"
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" * sqrt(%s));\n", qName.c_str(), bVar.c_str(),
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bVar.c_str(), dName.c_str());
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// compute both roots
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// r0 = q * params[1]
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code->appendf("\tfloat %s = %s * %s;\n", r0Name.c_str(), qName.c_str(),
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p1.c_str());
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// r1 = c / q
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code->appendf("\tfloat %s = %s / %s;\n", r1Name.c_str(), cName.c_str(),
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qName.c_str());
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// Note: If there are two roots that both generate radius(t) > 0, the
|
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// Canvas spec says to choose the larger t.
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// so we'll look at the larger one first:
|
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code->appendf("\tfloat %s = max(%s, %s);\n", tName.c_str(),
|
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r0Name.c_str(), r1Name.c_str());
|
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|
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// if r(t) for the larger root is <= 0, try the other one
|
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code->appendf("\tif (%s * %s + %s <= 0.0) {\n", tName.c_str(),
|
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p5.c_str(), p3.c_str());
|
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code->appendf("\t\t%s = min(%s, %s);\n", tName.c_str(),
|
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r0Name.c_str(), r1Name.c_str());
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|
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// if r(t) for the smaller root is also <= 0, set the fragment to
|
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// transparent black and return
|
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code->appendf("\t\tif (%s * %s + %s <= 0.0) {\n\t\t\tgl_FragColor = "
|
||||
"vec4(0.0,0.0,0.0,0.0);\n\t\t\treturn;\n\t\t}\n",
|
||||
tName.c_str(), p5.c_str(), p3.c_str());
|
||||
|
||||
code->appendf("\t}\n");
|
||||
} else {
|
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|
||||
// linear case: t = -c/b
|
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code->appendf("\tfloat %s = -(%s / %s);\n", tName.c_str(),
|
||||
cName.c_str(), bVar.c_str());
|
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|
||||
// set the fragment to transparent black and return if r(t) is <= 0
|
||||
code->appendf("\tif (%s * %s + %s <= 0.0) {\n\t\tgl_FragColor = vec4("
|
||||
"0.0,0.0,0.0,0.0);\n\t\treturn;\n\t}\n", tName.c_str(),
|
||||
p5.c_str(), p3.c_str());
|
||||
}
|
||||
state->fComplexCoord = true;
|
||||
|
||||
// x coord is: t
|
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// y coord is 0.5 (texture is effectively 1D)
|
||||
state->fSampleCoords.printf("\tvec2(%s, 0.5)", tName.c_str());
|
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|
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state->emitDefaultFetch(outputColor, samplerName);
|
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}
|
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|
||||
void GrGLConical2Gradient::initUniforms(const GrGLInterface* gl, int programID) {
|
||||
GR_GL_CALL_RET(gl, fVSParamLocation,
|
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GetUniformLocation(programID, fVSParamVar->getName().c_str()));
|
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GR_GL_CALL_RET(gl, fFSParamLocation,
|
||||
GetUniformLocation(programID, fFSParamVar->getName().c_str()));
|
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}
|
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|
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void GrGLConical2Gradient::setData(const GrGLInterface* gl,
|
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const GrGLTexture& texture,
|
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const GrCustomStage& baseData,
|
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int stageNum) {
|
||||
const GrConical2Gradient& data =
|
||||
static_cast<const GrConical2Gradient&>(baseData);
|
||||
GrAssert(data.isDegenerate() == fIsDegenerate);
|
||||
GrScalar centerX1 = data.center();
|
||||
GrScalar radius0 = data.radius();
|
||||
GrScalar diffRadius = data.diffRadius();
|
||||
|
||||
if (fCachedCenter != centerX1 ||
|
||||
fCachedRadius != radius0 ||
|
||||
fCachedDiffRadius != diffRadius) {
|
||||
|
||||
GrScalar a = GrMul(centerX1, centerX1) - diffRadius * diffRadius;
|
||||
|
||||
// When we're in the degenerate (linear) case, the second
|
||||
// value will be INF but the program doesn't read it. (We
|
||||
// use the same 6 uniforms even though we don't need them
|
||||
// all in the linear case just to keep the code complexity
|
||||
// down).
|
||||
float values[6] = {
|
||||
GrScalarToFloat(a * 4),
|
||||
1.f / (GrScalarToFloat(a)),
|
||||
GrScalarToFloat(centerX1),
|
||||
GrScalarToFloat(radius0),
|
||||
GrScalarToFloat(SkScalarMul(radius0, radius0)),
|
||||
GrScalarToFloat(diffRadius)
|
||||
};
|
||||
|
||||
GR_GL_CALL(gl, Uniform1fv(fVSParamLocation, 6, values));
|
||||
GR_GL_CALL(gl, Uniform1fv(fFSParamLocation, 6, values));
|
||||
fCachedCenter = centerX1;
|
||||
fCachedRadius = radius0;
|
||||
fCachedDiffRadius = diffRadius;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/////////////////////////////////////////////////////////////////////
|
||||
|
||||
GrConical2Gradient::GrConical2Gradient(GrScalar center,
|
||||
GrScalar radius,
|
||||
GrScalar diffRadius)
|
||||
: fCenterX1 (center)
|
||||
, fRadius0 (radius)
|
||||
, fDiffRadius (diffRadius) {
|
||||
|
||||
}
|
||||
|
||||
GrConical2Gradient::~GrConical2Gradient() {
|
||||
|
||||
}
|
||||
|
||||
|
||||
const GrProgramStageFactory& GrConical2Gradient::getFactory() const {
|
||||
return GrTProgramStageFactory<GrConical2Gradient>::getInstance();
|
||||
}
|
||||
|
||||
bool GrConical2Gradient::isEqual(const GrCustomStage& sBase) const {
|
||||
const GrConical2Gradient& s = static_cast<const GrConical2Gradient&>(sBase);
|
||||
return (this->isDegenerate() == s.isDegenerate());
|
||||
}
|
||||
|
||||
/////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
||||
class GrGLSweepGradient : public GrGLProgramStage {
|
||||
|
||||
public:
|
||||
|
|
|
|||
|
|
@ -92,6 +92,44 @@ private:
|
|||
typedef GrCustomStage INHERITED;
|
||||
};
|
||||
|
||||
class GrGLConical2Gradient;
|
||||
|
||||
class GrConical2Gradient : public GrCustomStage {
|
||||
|
||||
public:
|
||||
|
||||
GrConical2Gradient(GrScalar center, GrScalar radius, GrScalar diffRadius);
|
||||
virtual ~GrConical2Gradient();
|
||||
|
||||
static const char* Name() { return "Two-Point Conical Gradient"; }
|
||||
virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
|
||||
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
|
||||
|
||||
// The radial gradient parameters can collapse to a linear (instead
|
||||
// of quadratic) equation.
|
||||
bool isDegenerate() const { return SkScalarAbs(fDiffRadius) ==
|
||||
SkScalarAbs(fCenterX1); }
|
||||
GrScalar center() const { return fCenterX1; }
|
||||
GrScalar diffRadius() const { return fDiffRadius; }
|
||||
GrScalar radius() const { return fRadius0; }
|
||||
|
||||
typedef GrGLConical2Gradient GLProgramStage;
|
||||
|
||||
private:
|
||||
|
||||
// @{
|
||||
// Cache of values - these can change arbitrarily, EXCEPT
|
||||
// we shouldn't change between degenerate and non-degenerate?!
|
||||
|
||||
GrScalar fCenterX1;
|
||||
GrScalar fRadius0;
|
||||
GrScalar fDiffRadius;
|
||||
|
||||
// @}
|
||||
|
||||
typedef GrCustomStage INHERITED;
|
||||
};
|
||||
|
||||
class GrGLSweepGradient;
|
||||
|
||||
class GrSweepGradient : public GrCustomStage {
|
||||
|
|
|
|||
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