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75 lines
1.6 KiB
C++
75 lines
1.6 KiB
C++
//
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// Rectangle.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 11/07/2018.
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// Copyright © 2018 Thomas Harte. All rights reserved.
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//
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#include "Rectangle.hpp"
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using namespace Outputs::Display::OpenGL;
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Rectangle::Rectangle(float x, float y, float width, float height):
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pixel_shader_(
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"#version 150\n"
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"in vec2 position;"
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"void main(void)"
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"{"
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"gl_Position = vec4(position, 0.0, 1.0);"
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"}",
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"#version 150\n"
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"uniform vec4 colour;"
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"out vec4 fragColour;"
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"void main(void)"
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"{"
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"fragColour = colour;"
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"}"
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){
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pixel_shader_.bind();
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glGenVertexArrays(1, &drawing_vertex_array_);
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glGenBuffers(1, &drawing_array_buffer_);
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glBindVertexArray(drawing_vertex_array_);
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glBindBuffer(GL_ARRAY_BUFFER, drawing_array_buffer_);
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GLint position_attribute = pixel_shader_.get_attrib_location("position");
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glEnableVertexAttribArray(static_cast<GLuint>(position_attribute));
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glVertexAttribPointer(
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(GLuint)position_attribute,
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2,
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GL_FLOAT,
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GL_FALSE,
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2 * sizeof(GLfloat),
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(void *)0);
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colour_uniform_ = pixel_shader_.get_uniform_location("colour");
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float buffer[4*2];
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// Store positions.
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buffer[0] = x; buffer[1] = y;
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buffer[2] = x; buffer[3] = y + height;
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buffer[4] = x + width; buffer[5] = y;
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buffer[6] = x + width; buffer[7] = y + height;
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// Upload buffer.
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glBindBuffer(GL_ARRAY_BUFFER, drawing_array_buffer_);
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glBufferData(GL_ARRAY_BUFFER, sizeof(buffer), buffer, GL_STATIC_DRAW);
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}
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void Rectangle::draw(float red, float green, float blue) {
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pixel_shader_.bind();
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glUniform4f(colour_uniform_, red, green, blue, 1.0);
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glBindVertexArray(drawing_vertex_array_);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
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