148 lines
3.5 KiB
C++
148 lines
3.5 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#include "ui/gl/gl_primitives.h"
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#include "ui/gl/gl_shader.h"
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#include "ui/style/style_core.h"
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#include <QtGui/QOpenGLFunctions>
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namespace Ui::GL {
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static_assert(std::is_same_v<float, GLfloat>);
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void FillRectVertices(float *coords, Rect rect) {
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coords[0] = coords[10] = rect.left();
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coords[1] = coords[11] = rect.top();
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coords[2] = rect.right();
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coords[3] = rect.top();
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coords[4] = coords[6] = rect.right();
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coords[5] = coords[7] = rect.bottom();
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coords[8] = rect.left();
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coords[9] = rect.bottom();
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}
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void FillTriangles(
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QOpenGLFunctions &f,
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gsl::span<const float> coords,
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not_null<QOpenGLBuffer*> buffer,
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not_null<QOpenGLShaderProgram*> program,
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QSize viewportWithFactor,
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const QColor &color,
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Fn<void()> additional) {
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Expects(coords.size() % 6 == 0);
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if (coords.empty()) {
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return;
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}
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buffer->bind();
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buffer->allocate(coords.data(), coords.size() * sizeof(GLfloat));
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f.glUseProgram(program->programId());
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program->setUniformValue("viewport", QSizeF(viewportWithFactor));
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program->setUniformValue("s_color", Uniform(color));
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GLint position = program->attributeLocation("position");
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f.glVertexAttribPointer(
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position,
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2,
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GL_FLOAT,
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GL_FALSE,
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2 * sizeof(GLfloat),
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nullptr);
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f.glEnableVertexAttribArray(position);
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if (additional) {
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additional();
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}
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f.glDrawArrays(GL_TRIANGLES, 0, coords.size() / 2);
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f.glDisableVertexAttribArray(position);
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}
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void FillTexturedRectangle(
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QOpenGLFunctions &f,
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not_null<QOpenGLShaderProgram*> program,
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int skipVertices) {
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const auto shift = [&](int elements) {
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return reinterpret_cast<const void*>(
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(skipVertices * 4 + elements) * sizeof(GLfloat));
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};
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GLint position = program->attributeLocation("position");
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f.glVertexAttribPointer(
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position,
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2,
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GL_FLOAT,
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GL_FALSE,
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4 * sizeof(GLfloat),
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shift(0));
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f.glEnableVertexAttribArray(position);
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GLint texcoord = program->attributeLocation("v_texcoordIn");
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f.glVertexAttribPointer(
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texcoord,
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2,
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GL_FLOAT,
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GL_FALSE,
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4 * sizeof(GLfloat),
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shift(2));
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f.glEnableVertexAttribArray(texcoord);
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f.glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
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f.glDisableVertexAttribArray(position);
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f.glDisableVertexAttribArray(texcoord);
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}
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void BackgroundFiller::init(QOpenGLFunctions &f) {
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_bgBuffer.emplace();
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_bgBuffer->setUsagePattern(QOpenGLBuffer::DynamicDraw);
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_bgBuffer->create();
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_bgProgram.emplace();
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LinkProgram(
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&*_bgProgram,
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VertexShader({ VertexViewportTransform() }),
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FragmentShader({ FragmentStaticColor() }));
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}
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void BackgroundFiller::deinit(QOpenGLFunctions &f) {
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_bgProgram.reset();
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_bgBuffer.reset();
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}
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void BackgroundFiller::fill(
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QOpenGLFunctions &f,
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const QRegion ®ion,
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QSize viewport,
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float factor,
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const style::color &color) {
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const auto &rgb = color->c.toRgb();
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if (region.isEmpty()) {
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return;
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} else if (region.end() - region.begin() == 1
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&& (*region.begin()).size() == viewport) {
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f.glClearColor(rgb.redF(), rgb.greenF(), rgb.blueF(), rgb.alphaF());
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f.glClear(GL_COLOR_BUFFER_BIT);
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return;
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}
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_bgTriangles.resize((region.end() - region.begin()) * 12);
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auto coords = _bgTriangles.data();
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for (const auto rect : region) {
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FillRectVertices(coords, TransformRect(rect, viewport, factor));
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coords += 12;
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}
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FillTriangles(
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f,
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_bgTriangles,
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&*_bgBuffer,
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&*_bgProgram,
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viewport * factor,
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rgb);
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}
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} // namespace Ui::GL
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