"uniform mat4 transform;\n";
const char* gVS_Header_Uniforms_HasGradient[3] = {
// Linear
- "uniform float gradientLength;\n"
- "uniform vec2 gradient;\n"
- "uniform vec2 gradientStart;\n"
"uniform mat4 screenSpace;\n",
// Circular
"uniform vec2 gradientStart;\n"
" outTexCoords = texCoords;\n";
const char* gVS_Main_OutGradient[3] = {
// Linear
- " vec4 location = screenSpace * position;\n"
- " index = dot(location.xy - gradientStart, gradient) * gradientLength;\n",
+ " index = (screenSpace * position).x;\n",
// Circular
" vec4 location = screenSpace * position;\n"
" circular = (gradientMatrix * vec4(location.xy - gradientStart, 0.0, 0.0)).xy;\n",
// Linear gradient shader
///////////////////////////////////////////////////////////////////////////////
+static void toUnitMatrix(const SkPoint pts[2], SkMatrix* matrix) {
+ SkVector vec = pts[1] - pts[0];
+ const float mag = vec.length();
+ const float inv = mag ? 1.0f / mag : 0;
+
+ vec.scale(inv);
+ matrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY);
+ matrix->postTranslate(-pts[0].fX, -pts[0].fY);
+ matrix->postScale(inv, inv);
+}
+
SkiaLinearGradientShader::SkiaLinearGradientShader(float* bounds, uint32_t* colors,
float* positions, int count, SkShader* key, SkShader::TileMode tileMode,
SkMatrix* matrix, bool blend):
SkiaShader(kLinearGradient, key, tileMode, tileMode, matrix, blend),
mBounds(bounds), mColors(colors), mPositions(positions), mCount(count) {
+ SkPoint points[2];
+ points[0].set(bounds[0], bounds[1]);
+ points[1].set(bounds[2], bounds[3]);
+
+ SkMatrix unitMatrix;
+ toUnitMatrix(points, &unitMatrix);
+ mUnitMatrix.load(unitMatrix);
+
+ updateLocalMatrix(matrix);
}
SkiaLinearGradientShader::~SkiaLinearGradientShader() {
description.gradientType = ProgramDescription::kGradientLinear;
}
+void SkiaLinearGradientShader::computeScreenSpaceMatrix(mat4& screenSpace, const mat4& modelView) {
+ screenSpace.loadMultiply(mUnitMatrix, mShaderMatrix);
+ screenSpace.multiply(modelView);
+}
+
+void SkiaLinearGradientShader::updateLocalMatrix(const SkMatrix* matrix) {
+ if (matrix) {
+ mat4 localMatrix(*matrix);
+ mShaderMatrix.loadInverse(localMatrix);
+ }
+}
+
+void SkiaLinearGradientShader::setMatrix(SkMatrix* matrix) {
+ SkiaShader::setMatrix(matrix);
+ updateLocalMatrix(matrix);
+}
+
void SkiaLinearGradientShader::setupProgram(Program* program, const mat4& modelView,
const Snapshot& snapshot, GLuint* textureUnit) {
GLuint textureSlot = (*textureUnit)++;
texture = mGradientCache->addLinearGradient(mKey, mColors, mPositions, mCount, mTileX);
}
- Rect start(mBounds[0], mBounds[1], mBounds[2], mBounds[3]);
- if (mMatrix) {
- mat4 shaderMatrix(*mMatrix);
- shaderMatrix.mapPoint(start.left, start.top);
- shaderMatrix.mapPoint(start.right, start.bottom);
- }
- snapshot.transform->mapRect(start);
-
- const float gradientX = start.right - start.left;
- const float gradientY = start.bottom - start.top;
-
- mat4 screenSpace(*snapshot.transform);
- screenSpace.multiply(modelView);
+ mat4 screenSpace;
+ computeScreenSpaceMatrix(screenSpace, modelView);
// Uniforms
bindTexture(texture->id, gTileModes[mTileX], gTileModes[mTileY], textureSlot);
glUniform1i(program->getUniform("gradientSampler"), textureSlot);
- glUniform2f(program->getUniform("gradientStart"), start.left, start.top);
- glUniform2f(program->getUniform("gradient"), gradientX, gradientY);
- glUniform1f(program->getUniform("gradientLength"),
- 1.0f / (gradientX * gradientX + gradientY * gradientY));
glUniformMatrix4fv(program->getUniform("screenSpace"), 1, GL_FALSE, &screenSpace.data[0]);
}
void SkiaLinearGradientShader::updateTransforms(Program* program, const mat4& modelView,
const Snapshot& snapshot) {
- mat4 screenSpace(*snapshot.transform);
- screenSpace.multiply(modelView);
+ mat4 screenSpace;
+ computeScreenSpaceMatrix(screenSpace, modelView);
glUniformMatrix4fv(program->getUniform("screenSpace"), 1, GL_FALSE, &screenSpace.data[0]);
}
import android.graphics.Paint;
import android.graphics.Shader;
import android.os.Bundle;
+import android.view.Gravity;
import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.SeekBar;
@SuppressWarnings({"UnusedDeclaration"})
public class GradientsActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
- setContentView(new ShadersView(this));
+ final FrameLayout layout = new FrameLayout(this);
+ final ShadersView shadersView = new ShadersView(this);
+ final GradientView gradientView = new GradientView(this);
+ final SeekBar rotateView = new SeekBar(this);
+ rotateView.setMax(360);
+ rotateView.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+ @Override
+ public void onStopTrackingTouch(SeekBar seekBar) {
+ }
+
+ @Override
+ public void onStartTrackingTouch(SeekBar seekBar) {
+ }
+
+ @Override
+ public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+ gradientView.setRotationY((float)progress);
+ }
+ });
+
+ layout.addView(shadersView);
+ layout.addView(gradientView, new FrameLayout.LayoutParams(
+ 200, 200, Gravity.CENTER));
+ layout.addView(rotateView, new FrameLayout.LayoutParams(
+ 300, FrameLayout.LayoutParams.WRAP_CONTENT,
+ Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM));
+
+ setContentView(layout);
+ }
+
+ static class GradientView extends View {
+ private final Paint mPaint;
+
+ GradientView(Context c) {
+ super(c);
+
+ LinearGradient gradient = new LinearGradient(0, 0, 200, 0, 0xFF000000, 0,
+ Shader.TileMode.CLAMP);
+ mPaint = new Paint();
+ mPaint.setShader(gradient);
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+ setMeasuredDimension(200, 200);
+ }
+
+ @Override
+ protected void onDraw(Canvas canvas) {
+ super.onDraw(canvas);
+ canvas.drawRect(0.0f, 0.0f, getWidth(), getHeight(), mPaint);
+ }
}
static class ShadersView extends View {
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