mirror of
https://github.com/ciphervance/supercell-wx.git
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118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
#include <scwx/qt/gl/text_shader.hpp>
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#include <scwx/qt/gl/shader_program.hpp>
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#include <scwx/util/logger.hpp>
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#pragma warning(push, 0)
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#include <glm/gtc/type_ptr.hpp>
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#pragma warning(pop)
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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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static const auto logger_ = scwx::util::Logger::Create(logPrefix_);
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class TextShaderImpl
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{
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public:
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explicit TextShaderImpl(std::shared_ptr<GlContext> context) :
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context_ {context},
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shaderProgram_ {nullptr},
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projectionLocation_(GL_INVALID_INDEX)
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{
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}
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~TextShaderImpl() {}
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std::shared_ptr<GlContext> context_;
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std::shared_ptr<ShaderProgram> shaderProgram_;
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GLint projectionLocation_;
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};
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TextShader::TextShader(std::shared_ptr<GlContext> context) :
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p(std::make_unique<TextShaderImpl>(context))
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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->context_->gl();
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// Load and configure shader
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p->shaderProgram_ =
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p->context_->GetShaderProgram(":/gl/text.vert", ":/gl/text.frag");
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p->projectionLocation_ =
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gl.glGetUniformLocation(p->shaderProgram_->id(), "projection");
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if (p->projectionLocation_ == -1)
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{
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logger_->warn("Could not find projection");
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}
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return true;
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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->context_->gl();
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p->shaderProgram_->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->context_->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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