mirror of
https://github.com/love2d/love.git
synced 2026-08-16 16:20:42 +02:00
Alex Szpakowski
104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
/**
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* Copyright (c) 2006-2017 LOVE Development Team
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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**/
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#include "Text.h"
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#include "graphics/Graphics.h"
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#include "OpenGL.h"
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#include <algorithm>
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namespace love
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{
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namespace graphics
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{
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namespace opengl
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{
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Text::Text(love::graphics::Graphics *gfx, love::graphics::Font *font, const std::vector<Font::ColoredString> &text)
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: love::graphics::Text(gfx, font, text)
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{
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}
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Text::~Text()
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{
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}
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void Text::draw(Graphics *gfx, const Matrix4 &m)
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{
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if (vbo == nullptr || draw_commands.empty())
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return;
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gfx->flushStreamDraws();
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OpenGL::TempDebugGroup debuggroup("Text object draw");
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// Re-generate the text if the Font's texture cache was invalidated.
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if (font->getTextureCacheID() != texture_cache_id)
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regenerateVertices();
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int totalverts = 0;
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for (const Font::DrawCommand &cmd : draw_commands)
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totalverts = std::max(cmd.startvertex + cmd.vertexcount, totalverts);
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if ((size_t) totalverts / 4 > quadIndices.getSize())
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quadIndices = QuadIndices(gfx, (size_t) totalverts / 4);
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const size_t pos_offset = offsetof(Font::GlyphVertex, x);
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const size_t tex_offset = offsetof(Font::GlyphVertex, s);
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const size_t color_offset = offsetof(Font::GlyphVertex, color.r);
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const size_t stride = sizeof(Font::GlyphVertex);
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const GLenum gltype = quadIndices.getType();
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const size_t elemsize = quadIndices.getElementSize();
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Graphics::TempTransform transform(gfx, m);
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gl.prepareDraw();
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vbo->unmap(); // Make sure all pending data is flushed to the GPU.
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gl.bindBuffer(BUFFER_VERTEX, (GLuint) vbo->getHandle());
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glVertexAttribPointer(ATTRIB_POS, 2, GL_FLOAT, GL_FALSE, stride, BUFFER_OFFSET(pos_offset));
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glVertexAttribPointer(ATTRIB_TEXCOORD, 2, GL_UNSIGNED_SHORT, GL_TRUE, stride, BUFFER_OFFSET(tex_offset));
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glVertexAttribPointer(ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, stride, BUFFER_OFFSET(color_offset));
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gl.useVertexAttribArrays(ATTRIBFLAG_POS | ATTRIBFLAG_TEXCOORD | ATTRIBFLAG_COLOR);
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gl.bindBuffer(BUFFER_INDEX, (GLuint) quadIndices.getBuffer()->getHandle());
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// We need a separate draw call for every section of the text which uses a
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// different texture than the previous section.
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for (const Font::DrawCommand &cmd : draw_commands)
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{
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GLsizei count = (cmd.vertexcount / 4) * 6;
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size_t offset = (cmd.startvertex / 4) * 6 * elemsize;
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// TODO: Use glDrawElementsBaseVertex when supported?
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gl.bindTextureToUnit((GLuint) cmd.texture, 0, false);
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gl.drawElements(GL_TRIANGLES, count, gltype, BUFFER_OFFSET(offset));
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}
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}
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} // opengl
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} // graphics
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} // love
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