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* Copyright © 2014 Canonical Ltd.
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License version 3,
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* as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* Authored by: Daniel van Vugt <daniel.van.vugt@canonical.com>
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* Kevin DuBois <kevin.dubois@canonical.com>
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#include "mir/graphics/tessellation_helpers.h"
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#include "mir/graphics/renderable.h"
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#include "mir/graphics/buffer.h"
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namespace mg = mir::graphics;
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namespace geom = mir::geometry;
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mg::GLPrimitive mg::tessellate_renderable_into_rectangle(
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mg::Renderable const& renderable, geom::Displacement const& offset)
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auto const& buf_size = renderable.buffer()->size();
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auto rect = renderable.screen_position();
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rect.top_left = rect.top_left - offset;
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GLfloat left = rect.top_left.x.as_int();
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GLfloat right = left + rect.size.width.as_int();
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GLfloat top = rect.top_left.y.as_int();
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GLfloat bottom = top + rect.size.height.as_int();
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mg::GLPrimitive rectangle;
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rectangle.type = GL_TRIANGLE_STRIP;
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GLfloat tex_right = static_cast<GLfloat>(rect.size.width.as_int()) /
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buf_size.width.as_int();
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GLfloat tex_bottom = static_cast<GLfloat>(rect.size.height.as_int()) /
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buf_size.height.as_int();
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auto& vertices = rectangle.vertices;
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vertices[0] = {{left, top, 0.0f}, {0.0f, 0.0f}};
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vertices[1] = {{left, bottom, 0.0f}, {0.0f, tex_bottom}};
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vertices[2] = {{right, top, 0.0f}, {tex_right, 0.0f}};
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vertices[3] = {{right, bottom, 0.0f}, {tex_right, tex_bottom}};
added
removed
src/platform/graphics/tessellation_helpers.cpp
