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109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
#include <scwx/qt/gl/text_shader.hpp>
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#include <boost/log/trivial.hpp>
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#include <glm/gtc/type_ptr.hpp>
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namespace scwx
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{
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namespace qt
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{
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namespace gl
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{
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static const std::string logPrefix_ = "[scwx::qt::gl::text_shader] ";
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class TextShaderImpl
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{
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public:
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explicit TextShaderImpl(OpenGLFunctions& gl) :
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gl_ {gl}, projectionLocation_(GL_INVALID_INDEX)
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{
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}
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~TextShaderImpl() {}
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OpenGLFunctions& gl_;
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GLint projectionLocation_;
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};
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TextShader::TextShader(OpenGLFunctions& gl) :
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ShaderProgram(gl), p(std::make_unique<TextShaderImpl>(gl))
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{
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}
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TextShader::~TextShader() = default;
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TextShader::TextShader(TextShader&&) noexcept = default;
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TextShader& TextShader::operator=(TextShader&&) noexcept = default;
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bool TextShader::Initialize()
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{
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OpenGLFunctions& gl = p->gl_;
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// Load and configure shader
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bool success = Load(":/gl/text.vert", ":/gl/text.frag");
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p->projectionLocation_ = gl.glGetUniformLocation(id(), "projection");
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if (p->projectionLocation_ == -1)
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{
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BOOST_LOG_TRIVIAL(warning) << logPrefix_ << "Could not find projection";
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}
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return success;
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}
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void TextShader::RenderText(const std::string& text,
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float x,
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float y,
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float pointSize,
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const glm::mat4& projection,
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const boost::gil::rgba8_pixel_t& color,
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std::shared_ptr<util::Font> font,
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GLuint textureId,
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TextAlign align)
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{
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OpenGLFunctions& gl = p->gl_;
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Use();
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gl.glEnable(GL_BLEND);
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gl.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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gl.glUniformMatrix4fv(
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p->projectionLocation_, 1, GL_FALSE, glm::value_ptr(projection));
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gl.glActiveTexture(GL_TEXTURE0);
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gl.glBindTexture(GL_TEXTURE_2D, textureId);
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switch (align)
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{
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case TextAlign::Left:
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// Do nothing
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break;
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case TextAlign::Center:
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// X position is the center of text, subtract half length
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x -= font->TextLength(text, pointSize) * 0.5f;
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break;
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case TextAlign::Right:
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// X position is the end of text, subtract length
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x -= font->TextLength(text, pointSize);
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break;
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}
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std::shared_ptr<util::FontBuffer> buffer =
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std::make_shared<util::FontBuffer>();
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font->BufferText(buffer, text, x, y, pointSize, color);
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buffer->Render(gl);
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}
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void TextShader::SetProjection(const glm::mat4& projection)
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{
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p->gl_.glUniformMatrix4fv(
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p->projectionLocation_, 1, GL_FALSE, glm::value_ptr(projection));
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}
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} // namespace gl
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} // namespace qt
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} // namespace scwx
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