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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "Flatland.h"
#include "GLHelper.h"
namespace android {
class Blitter {
public:
bool setUp(GLHelper* helper) {
bool result;
result = helper->getShaderProgram("Blit", &mBlitPgm);
if (!result) {
return false;
}
mPosAttribLoc = glGetAttribLocation(mBlitPgm, "position");
mUVAttribLoc = glGetAttribLocation(mBlitPgm, "uv");
mUVToTexUniformLoc = glGetUniformLocation(mBlitPgm, "uvToTex");
mObjToNdcUniformLoc = glGetUniformLocation(mBlitPgm, "objToNdc");
mBlitSrcSamplerLoc = glGetUniformLocation(mBlitPgm, "blitSrc");
mModColorUniformLoc = glGetUniformLocation(mBlitPgm, "modColor");
return true;
}
bool blit(GLuint texName, const float* texMatrix,
int32_t x, int32_t y, uint32_t w, uint32_t h) {
float modColor[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
return modBlit(texName, texMatrix, modColor, x, y, w, h);
}
bool modBlit(GLuint texName, const float* texMatrix, float* modColor,
int32_t x, int32_t y, uint32_t w, uint32_t h) {
glUseProgram(mBlitPgm);
GLint vp[4];
glGetIntegerv(GL_VIEWPORT, vp);
float screenToNdc[16] = {
2.0f/float(vp[2]), 0.0f, 0.0f, 0.0f,
0.0f, -2.0f/float(vp[3]), 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
-1.0f, 1.0f, 0.0f, 1.0f,
};
const float pos[] = {
float(x), float(y),
float(x+w), float(y),
float(x), float(y+h),
float(x+w), float(y+h),
};
const float uv[] = {
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
};
glVertexAttribPointer(mPosAttribLoc, 2, GL_FLOAT, GL_FALSE, 0, pos);
glVertexAttribPointer(mUVAttribLoc, 2, GL_FLOAT, GL_FALSE, 0, uv);
glEnableVertexAttribArray(mPosAttribLoc);
glEnableVertexAttribArray(mUVAttribLoc);
glUniformMatrix4fv(mObjToNdcUniformLoc, 1, GL_FALSE, screenToNdc);
glUniformMatrix4fv(mUVToTexUniformLoc, 1, GL_FALSE, texMatrix);
glUniform4fv(mModColorUniformLoc, 1, modColor);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_EXTERNAL_OES, texName);
glUniform1i(mBlitSrcSamplerLoc, 0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(mPosAttribLoc);
glDisableVertexAttribArray(mUVAttribLoc);
if (glGetError() != GL_NO_ERROR) {
fprintf(stderr, "GL error!\n");
}
return true;
}
private:
GLuint mBlitPgm;
GLint mPosAttribLoc;
GLint mUVAttribLoc;
GLint mUVToTexUniformLoc;
GLint mObjToNdcUniformLoc;
GLint mBlitSrcSamplerLoc;
GLint mModColorUniformLoc;
};
class ComposerBase : public Composer {
public:
virtual ~ComposerBase() {}
virtual bool setUp(const LayerDesc& desc,
GLHelper* helper) {
mLayerDesc = desc;
return setUp(helper);
}
virtual void tearDown() {
}
virtual bool compose(GLuint texName, const sp<GLConsumer>& glc) {
return true;
}
protected:
virtual bool setUp(GLHelper* helper) {
return true;
}
LayerDesc mLayerDesc;
};
Composer* nocomp() {
class NoComp : public ComposerBase {
};
return new NoComp();
}
Composer* opaque() {
class OpaqueComp : public ComposerBase {
virtual bool setUp(GLHelper* helper) {
return mBlitter.setUp(helper);
}
virtual bool compose(GLuint texName, const sp<GLConsumer>& glc) {
float texMatrix[16];
glc->getTransformMatrix(texMatrix);
int32_t x = mLayerDesc.x;
int32_t y = mLayerDesc.y;
int32_t w = mLayerDesc.width;
int32_t h = mLayerDesc.height;
return mBlitter.blit(texName, texMatrix, x, y, w, h);
}
Blitter mBlitter;
};
return new OpaqueComp();
}
Composer* opaqueShrink() {
class OpaqueComp : public ComposerBase {
virtual bool setUp(GLHelper* helper) {
mParity = false;
return mBlitter.setUp(helper);
}
virtual bool compose(GLuint texName, const sp<GLConsumer>& glc) {
float texMatrix[16];
glc->getTransformMatrix(texMatrix);
int32_t x = mLayerDesc.x;
int32_t y = mLayerDesc.y;
int32_t w = mLayerDesc.width;
int32_t h = mLayerDesc.height;
mParity = !mParity;
if (mParity) {
x += w / 128;
y += h / 128;
w -= w / 64;
h -= h / 64;
}
return mBlitter.blit(texName, texMatrix, x, y, w, h);
}
Blitter mBlitter;
bool mParity;
};
return new OpaqueComp();
}
Composer* blend() {
class BlendComp : public ComposerBase {
virtual bool setUp(GLHelper* helper) {
return mBlitter.setUp(helper);
}
virtual bool compose(GLuint texName, const sp<GLConsumer>& glc) {
bool result;
float texMatrix[16];
glc->getTransformMatrix(texMatrix);
float modColor[4] = { .75f, .75f, .75f, .75f };
int32_t x = mLayerDesc.x;
int32_t y = mLayerDesc.y;
int32_t w = mLayerDesc.width;
int32_t h = mLayerDesc.height;
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
result = mBlitter.modBlit(texName, texMatrix, modColor,
x, y, w, h);
if (!result) {
return false;
}
glDisable(GL_BLEND);
return true;
}
Blitter mBlitter;
};
return new BlendComp();
}
Composer* blendShrink() {
class BlendShrinkComp : public ComposerBase {
virtual bool setUp(GLHelper* helper) {
mParity = false;
return mBlitter.setUp(helper);
}
virtual bool compose(GLuint texName, const sp<GLConsumer>& glc) {
bool result;
float texMatrix[16];
glc->getTransformMatrix(texMatrix);
float modColor[4] = { .75f, .75f, .75f, .75f };
int32_t x = mLayerDesc.x;
int32_t y = mLayerDesc.y;
int32_t w = mLayerDesc.width;
int32_t h = mLayerDesc.height;
mParity = !mParity;
if (mParity) {
x += w / 128;
y += h / 128;
w -= w / 64;
h -= h / 64;
}
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
result = mBlitter.modBlit(texName, texMatrix, modColor,
x, y, w, h);
if (!result) {
return false;
}
glDisable(GL_BLEND);
return true;
}
Blitter mBlitter;
bool mParity;
};
return new BlendShrinkComp();
}
} // namespace android