init

Telegram/lib_ui/ui/gl/gl_primitives.cpp

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#include "ui/gl/gl_primitives.h"
+
+#include "ui/gl/gl_shader.h"
+#include "ui/style/style_core.h"
+
+#include <QtGui/QOpenGLFunctions>
+
+namespace Ui::GL {
+
+static_assert(std::is_same_v<float, GLfloat>);
+
+void FillRectTriangleVertices(float *coords, Rect rect) {
+	coords[0] = coords[10] = rect.left();
+	coords[1] = coords[11] = rect.top();
+	coords[2] = rect.right();
+	coords[3] = rect.top();
+	coords[4] = coords[6] = rect.right();
+	coords[5] = coords[7] = rect.bottom();
+	coords[8] = rect.left();
+	coords[9] = rect.bottom();
+}
+
+void FillTriangles(
+		QOpenGLFunctions &f,
+		gsl::span<const float> coords,
+		not_null<QOpenGLBuffer*> buffer,
+		not_null<QOpenGLShaderProgram*> program,
+		const QColor &color,
+		Fn<void()> additional) {
+	Expects(coords.size() % 6 == 0);
+
+	if (coords.empty()) {
+		return;
+	}
+	buffer->bind();
+	buffer->allocate(coords.data(), coords.size() * sizeof(GLfloat));
+
+	program->setUniformValue("s_color", color);
+
+	GLint position = program->attributeLocation("position");
+	f.glVertexAttribPointer(
+		position,
+		2,
+		GL_FLOAT,
+		GL_FALSE,
+		2 * sizeof(GLfloat),
+		nullptr);
+	f.glEnableVertexAttribArray(position);
+
+	if (additional) {
+		additional();
+	}
+
+	f.glDrawArrays(GL_TRIANGLES, 0, coords.size() / 2);
+
+	f.glDisableVertexAttribArray(position);
+}
+
+void FillRectangle(
+		QOpenGLFunctions &f,
+		not_null<QOpenGLShaderProgram*> program,
+		int skipVertices,
+		const QColor &color) {
+	const auto shift = [&](int elements) {
+		return reinterpret_cast<const void*>(
+			(skipVertices * 4 + elements) * sizeof(GLfloat));
+	};
+	program->setUniformValue("s_color", color);
+
+	GLint position = program->attributeLocation("position");
+	f.glVertexAttribPointer(
+		position,
+		2,
+		GL_FLOAT,
+		GL_FALSE,
+		2 * sizeof(GLfloat),
+		shift(0));
+	f.glEnableVertexAttribArray(position);
+
+	f.glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+	f.glDisableVertexAttribArray(position);
+}
+
+void FillTexturedRectangle(
+		QOpenGLFunctions &f,
+		not_null<QOpenGLShaderProgram*> program,
+		int skipVertices) {
+	const auto shift = [&](int elements) {
+		return reinterpret_cast<const void*>(
+			(skipVertices * 4 + elements) * sizeof(GLfloat));
+	};
+	GLint position = program->attributeLocation("position");
+	f.glVertexAttribPointer(
+		position,
+		2,
+		GL_FLOAT,
+		GL_FALSE,
+		4 * sizeof(GLfloat),
+		shift(0));
+	f.glEnableVertexAttribArray(position);
+
+	GLint texcoord = program->attributeLocation("v_texcoordIn");
+	f.glVertexAttribPointer(
+		texcoord,
+		2,
+		GL_FLOAT,
+		GL_FALSE,
+		4 * sizeof(GLfloat),
+		shift(2));
+	f.glEnableVertexAttribArray(texcoord);
+
+	f.glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+	f.glDisableVertexAttribArray(position);
+	f.glDisableVertexAttribArray(texcoord);
+}
+
+} // namespace Ui::GL