void DisplayOzone::drawBuffer(Buffer *buffer)
{
if (!mDrawing)
{
// get buffer on which to draw window
if (mUnused)
{
mDrawing = mUnused;
mUnused = nullptr;
}
else
{
mDrawing = new Buffer(this, GBM_BO_USE_RENDERING | GBM_BO_USE_SCANOUT,
GBM_FORMAT_ARGB8888, DRM_FORMAT_ARGB8888, DRM_FORMAT_XRGB8888,
true, true); // XXX shouldn't need stencil
if (!mDrawing || !mDrawing->initialize(mWidth, mHeight))
{
return;
}
}
StateManagerGL *sm = getRenderer()->getStateManager();
sm->bindFramebuffer(GL_DRAW_FRAMEBUFFER, mDrawing->getGLFB());
sm->setClearColor(gl::ColorF(0, 0, 0, 1));
sm->setClearDepth(1);
sm->setScissorTestEnabled(false);
sm->setColorMask(true, true, true, true);
sm->setDepthMask(true);
mFunctionsGL->clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
drawWithTexture(buffer);
presentScreen();
}
void DisplayOzone::drawWithTexture(Buffer *buffer)
{
FunctionsGL *gl = mFunctionsGL;
StateManagerGL *sm = getRenderer()->getStateManager();
if (!mProgram)
{
const GLchar *vertexSource =
"#version 100\n"
"attribute vec3 vertex;\n"
"uniform vec2 center;\n"
"uniform vec2 windowSize;\n"
"uniform vec2 borderSize;\n"
"uniform float depth;\n"
"varying vec3 texCoord;\n"
"void main()\n"
"{\n"
" vec2 pos = vertex.xy * (windowSize + borderSize * vertex.z);\n"
" gl_Position = vec4(center + pos, depth, 1);\n"
" texCoord = vec3(pos / windowSize * vec2(.5, -.5) + vec2(.5, .5), vertex.z);\n"
"}\n";
const GLchar *fragmentSource =
"#version 100\n"
"precision mediump float;\n"
"uniform sampler2D tex;\n"
"varying vec3 texCoord;\n"
"void main()\n"
"{\n"
" if (texCoord.z > 0.)\n"
" {\n"
" float c = abs((texCoord.z * 2.) - 1.);\n"
" gl_FragColor = vec4(c, c, c, 1);\n"
" }\n"
" else\n"
" {\n"
" gl_FragColor = texture2D(tex, texCoord.xy);\n"
" }\n"
"}\n";
mVertexShader = makeShader(GL_VERTEX_SHADER, vertexSource);
mFragmentShader = makeShader(GL_FRAGMENT_SHADER, fragmentSource);
mProgram = gl->createProgram();
gl->attachShader(mProgram, mVertexShader);
gl->attachShader(mProgram, mFragmentShader);
gl->bindAttribLocation(mProgram, 0, "vertex");
gl->linkProgram(mProgram);
GLint linked;
gl->getProgramiv(mProgram, GL_LINK_STATUS, &linked);
ASSERT(linked);
mCenterUniform = gl->getUniformLocation(mProgram, "center");
mWindowSizeUniform = gl->getUniformLocation(mProgram, "windowSize");
mBorderSizeUniform = gl->getUniformLocation(mProgram, "borderSize");
mDepthUniform = gl->getUniformLocation(mProgram, "depth");
GLint texUniform = gl->getUniformLocation(mProgram, "tex");
sm->useProgram(mProgram);
gl->uniform1i(texUniform, 0);
// clang-format off
const GLfloat vertices[] =
{
// window corners, and window border inside corners
1, -1, 0,
-1, -1, 0,
1, 1, 0,
-1, 1, 0,
// window border outside corners
1, -1, 1,
-1, -1, 1,
1, 1, 1,
-1, 1, 1,
};
// clang-format on
gl->genBuffers(1, &mVertexBuffer);
sm->bindBuffer(GL_ARRAY_BUFFER, mVertexBuffer);
gl->bufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// window border triangle strip
const GLuint borderStrip[] = {5, 0, 4, 2, 6, 3, 7, 1, 5, 0};
gl->genBuffers(1, &mIndexBuffer);
sm->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer);
gl->bufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(borderStrip), borderStrip, GL_STATIC_DRAW);
}
else
{
sm->useProgram(mProgram);
sm->bindBuffer(GL_ARRAY_BUFFER, mVertexBuffer);
sm->bindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer);
}
// convert from pixels to "-1 to 1" space
const NativeWindow *n = buffer->getNative();
double x = n->x * 2. / mWidth - 1;
double y = n->y * 2. / mHeight - 1;
double halfw = n->width * 1. / mWidth;
double halfh = n->height * 1. / mHeight;
double borderw = n->borderWidth * 2. / mWidth;
double borderh = n->borderHeight * 2. / mHeight;
gl->uniform2f(mCenterUniform, x + halfw, y + halfh);
gl->uniform2f(mWindowSizeUniform, halfw, halfh);
gl->uniform2f(mBorderSizeUniform, borderw, borderh);
gl->uniform1f(mDepthUniform, n->depth / 1e6);
sm->setBlendEnabled(false);
sm->setCullFaceEnabled(false);
sm->setStencilTestEnabled(false);
sm->setScissorTestEnabled(false);
sm->setDepthTestEnabled(true);
sm->setColorMask(true, true, true, true);
sm->setDepthMask(true);
sm->setDepthRange(0, 1);
sm->setDepthFunc(GL_LESS);
sm->setViewport(gl::Rectangle(0, 0, mWidth, mHeight));
sm->activeTexture(0);
GLuint tex = buffer->getTexture();
sm->bindTexture(GL_TEXTURE_2D, tex);
gl->vertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
gl->enableVertexAttribArray(0);
sm->bindFramebuffer(GL_DRAW_FRAMEBUFFER, mDrawing->getGLFB());
gl->drawArrays(GL_TRIANGLE_STRIP, 0, 4);
gl->drawElements(GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, 0);
sm->deleteTexture(tex);
}