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333 lines
11 KiB
C++
333 lines
11 KiB
C++
// "Copyright [2023] <Krzysztof Rudnicki>"
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#ifndef DRAW_CPP
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#define DRAW_CPP
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <iostream>
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#include <cmath>
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#include <filesystem>
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#include <utility>
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#include "./draw.hpp"
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#include "./renderLoop.hpp"
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#include "./shaders.hpp"
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#include "./constants.hpp"
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#include "./misc.hpp"
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#include "./shader.hpp"
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#include "./textures.hpp"
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#include "./stb_image.h"
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drawFigureReturn drawFigure(const int whatToDraw) {
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switch (whatToDraw) {
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case 0:
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return drawTriangleClass(
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constants::TRIANGLE_VERTICES,
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constants::TRIANGLE_VERTICES_SIZE,
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constants::VERTEX_SHADER_SOURCE_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME);
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case 1:
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return drawSquare(
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constants::SQUARE_VERTICES,
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constants::SQUARE_VERTICES_SIZE,
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constants::SQUARE_INDICES, constants::SQUARE_INDICES_SIZE,
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constants::VERTEX_SHADER_SOURCE,
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constants::FRAGMENT_SHADER_SOURCE);
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case 2:
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// Try to draw 2 triangles next to each other
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// using glDrawArrays by adding more vertices to your data.
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return drawTriangleClass(
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constants::TRIANGLES_VERTICES,
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constants::TRIANGLES_VERTICES_SIZE,
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constants::VERTEX_SHADER_SOURCE_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME);
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case 3:
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drawTriangleClass(constants::TRIANGLE_ONE,
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constants::TRIANGLE_ONE_SIZE,
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constants::VERTEX_SHADER_SOURCE_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME);
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// Now create the same 2 triangles
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// using two different VAOs and VBOs for their data
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return drawTriangleClass(
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constants::TRIANGLE_TWO,
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constants::TRIANGLE_TWO_SIZE,
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constants::VERTEX_SHADER_SOURCE_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME);
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case 4:
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drawTriangleClass(constants::TRIANGLE_ONE,
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constants::TRIANGLE_ONE_SIZE,
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constants::VERTEX_SHADER_SOURCE_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME);
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/*
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Create two shader programs where
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the second program uses a different
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fragment shader that outputs the color yellow;
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draw both triangles again where one outputs the color yellow
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*/
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return drawTriangleClass(
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constants::TRIANGLE_TWO,
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constants::TRIANGLE_TWO_SIZE,
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constants::VERTEX_SHADER_SOURCE_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_YELLOW_FILENAME);
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case 5:
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// Get color from vertex shader to fragment shader
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return drawTriangleClass(constants::TRIANGLE_VERTICES,
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constants::TRIANGLE_VERTICES_SIZE,
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constants::VERTEX_SHADER_COLOR_FILENAME,
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constants::FRAGMENT_SHADER_COLOR_FROM_VERTEX_FILENAME);
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case 6:
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// set color from opengl code to uniform value in fragment shader
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return drawTriangleClass(constants::TRIANGLE_VERTICES,
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constants::TRIANGLE_VERTICES_SIZE,
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constants::VERTEX_SHADER_COLOR_FILENAME,
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constants::FRAGMENT_SHADER_UNIFORMS_FILENAME);
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case 7:
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// set color from opengl code to uniform value in fragment shader
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return drawTriangleClass(constants::TRIANGLE_COLORS,
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constants::TRIANGLE_COLORS_SIZE,
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constants::VERTEX_SHADER_VERTICE_COLOR_FILENAME,
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constants::FRAGMENT_SHADER_COLOR_FROM_VERTEX_FILENAME,
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true);
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case 8:
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// upside down triangle
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return drawTriangleClass(constants::TRIANGLE_VERTICES,
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constants::TRIANGLE_VERTICES_SIZE,
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constants::VERTEX_SHADER_UPSIDE_DOWN_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME);
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case 9:
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{
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// offset triangle
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offsetsStruct offsets = offsetsStruct();
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offsets.xOffset = 0.5f;
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return drawTriangleClass(constants::TRIANGLE_VERTICES,
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constants::TRIANGLE_VERTICES_SIZE,
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constants::VERTEX_SHADER_OFFSET_FILENAME,
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constants::FRAGMENT_SHADER_SOURCE_FILENAME,
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false,
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false,
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offsets);
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}
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case 10:
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return drawTriangleClass(constants::TRIANGLE_VERTICES,
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constants::TRIANGLE_VERTICES_SIZE,
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constants::VERTEX_SHADER_TASK_THREE_FILENAME,
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constants::FRAGMENT_SHADER_TASK_THREE_FILENAME);
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case constants::MAX_DRAW_CALL:
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return drawDebilMode(
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constants::VERTEX_SHADER_TEXTURE_FILENAME,
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constants::FRAGMENT_SHADER_TEXTURE_FILENAME,
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constants::TEXTURE_VERTICES,
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constants::TEXTURE_VERTICES_SIZE,
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constants::TEXTURE_INDICES,
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constants::TEXTURE_INDICES_SIZE);
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default:
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throw "No function for this draw call";
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}
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}
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unsigned int getShaderProgram(
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const char* vertexShaderSource,
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const char* fragmentShaderSource) {
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const std::pair<unsigned int, unsigned int> shaders =
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compileShaders(vertexShaderSource, fragmentShaderSource);
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if (shaders.first == 0 || shaders.second == 0)
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return 0;
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const unsigned int shaderProgram =
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linkShaderObjectsShaderProgram(shaders.first, shaders.second);
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if (shaderProgram == 0)
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return 0;
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return shaderProgram;
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}
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void setOffsets(Shader shader, const offsetsStruct offsets) {
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shader.setFloat("xOffset", offsets.xOffset);
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shader.setFloat("yOffset", offsets.yOffset);
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shader.setFloat("zOffset", offsets.zOffset);
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}
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drawFigureReturn drawTriangleClass(
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const float triangleVertices[],
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const size_t triangleVerticesSize,
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const char* vertexPath,
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const char* fragmentPath,
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const bool colorIncluded,
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const bool textureIncluded,
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const offsetsStruct offsets) {
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// In your CPP file:
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// ======================
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// float offset = 0.5f;
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Shader ourShader(vertexPath, fragmentPath);
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ourShader.use();
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setOffsets(ourShader, offsets);
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const unsigned int vertexBufferObject =
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copyVerticesMemory(
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triangleVertices,
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triangleVerticesSize,
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GL_ARRAY_BUFFER);
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const unsigned int vertexArrayObject = generateBindVAO();
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copyVerticesArray(
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vertexBufferObject,
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triangleVertices,
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triangleVerticesSize,
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GL_ARRAY_BUFFER);
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// set vertex attribute pointers
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configureVertexAttribute(colorIncluded, textureIncluded);
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doDrawArrays(
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ourShader.ID,
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vertexArrayObject,
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GL_TRIANGLES,
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0,
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triangleVerticesSize);
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drawFigureReturn newReturn;
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newReturn.success = 0;
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newReturn.VAO = vertexArrayObject;
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newReturn.VBO = vertexBufferObject;
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newReturn.EBO = 0;
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return newReturn;
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}
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drawFigureReturn drawSquare(
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const float squareVertices[],
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const size_t squareVerticesSize,
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const unsigned int squareIndices[],
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const size_t squareIndicesSize,
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const char* vertexShaderSource,
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const char* fragmentShaderSource,
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const bool colorIncluded,
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const bool textureIncluded,
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const offsetsStruct offsets) {
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const unsigned int shaderProgram =
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getShaderProgram(vertexShaderSource, fragmentShaderSource);
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drawFigureReturn newReturn = drawFigureReturn();
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if (shaderProgram == 0) {
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newReturn.success = -1;
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return newReturn;
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}
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const unsigned int VAO = generateBindVAO();
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copyVerticesMemory(squareVertices, squareVerticesSize, GL_ARRAY_BUFFER);
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copyVerticesMemory(
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squareIndices,
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squareIndicesSize,
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GL_ELEMENT_ARRAY_BUFFER);
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// set vertex attribute pointers
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configureVertexAttribute(colorIncluded, textureIncluded);
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doDrawElements(
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shaderProgram,
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VAO,
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GL_TRIANGLES,
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GL_UNSIGNED_INT,
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squareIndicesSize);
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newReturn.success = 0;
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newReturn.VAO = VAO;
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return newReturn;
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}
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drawFigureReturn drawDebilMode(
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const char* vertexPath,
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const char* fragmentPath,
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const float vertices[],
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const size_t verticesSize,
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const unsigned int indices[],
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const size_t indicesSize) {
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// https://stackoverflow.com/questions/33883609/opengl-linker-error-linking-with-uncompiled-shader
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Shader ourShader(
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constants::VERTEX_SHADER_TEXTURE_FILENAME,
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constants::FRAGMENT_SHADER_TEXTURE_FILENAME);
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unsigned int VAO = generateBindVAO();
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unsigned int VBO = copyVerticesMemory(
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vertices,
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verticesSize,
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GL_ARRAY_BUFFER);
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unsigned int EBO = copyVerticesMemory(indices,
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indicesSize,
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GL_ELEMENT_ARRAY_BUFFER);
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configureVertexAttribute(true, true);
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unsigned int texture1 = loadAndCreateTexture("assets/container.png", true);
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unsigned int texture2 = loadAndCreateTexture(
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"assets/awesomeface.png",
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false);
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ourShader.use(); // don't forget to activate/use
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// the shader before setting uniforms!
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// set it via the texture class
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ourShader.setInt("texture1", 0);
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ourShader.setInt("texture2", 1);
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activateAndBindTextures(texture1, GL_TEXTURE0);
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activateAndBindTextures(texture2, GL_TEXTURE1);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
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drawFigureReturn newReturn;
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newReturn.success = 0;
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newReturn.VAO = VAO;
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newReturn.VBO = VBO;
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newReturn.EBO = EBO;
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return newReturn;
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}
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void doDrawElements(
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const unsigned int shaderProgram,
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const unsigned int vertexArrayObject,
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const GLenum drawArrayMode,
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const GLenum drawType,
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const int numberOfElementsToDraw) {
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glUseProgram(shaderProgram);
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glBindVertexArray(vertexArrayObject);
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glDrawElements(drawArrayMode, numberOfElementsToDraw, drawType, 0);
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glBindVertexArray(0);
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}
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void updateUniformColor(
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const unsigned int shaderProgram,
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const GLchar* uniformName) {
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// update the uniform color
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const float timeValue = glfwGetTime(); // retrieve running time
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const float greenValue =
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sin(timeValue) / 2.0f + 0.5f;
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// vary the color from 0.0 to 1.0 using sin
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// query the location of our uniform
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const int vertexColorLocation =
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glGetUniformLocation(shaderProgram, uniformName);
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// if glGetUniformLocation returns -1 it could not find the location
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if (vertexColorLocation != -1) {
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glUniform4f(vertexColorLocation, 0.0f, greenValue, 0.0f, 1.0f);
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/* we set the uniform value using glUniform4f
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4f means that it expects 4 floats
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few of possible postfixes:
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f: the function expects a float as its value.
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i: the function expects an int as its value.
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ui: the function expects an unsigned int as its value.
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3f: the function expects 3 floats as its value.
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fv: the function expects a float vector/array as its value.
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*/
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}
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}
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void doDrawArrays(
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const unsigned int shaderProgram,
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const unsigned int vertexArrayObject,
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const GLenum drawArrayMode,
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const int firstIndex,
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const unsigned int numberOfIndicesToBeRendered) {
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// use shader program to render an object
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glUseProgram(shaderProgram);
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updateUniformColor(shaderProgram, "ourColor");
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glBindVertexArray(vertexArrayObject);
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// From left:
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// primitive type we want to draw
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// starting index of vertex array
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// how many vertices we want to draw
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glDrawArrays(drawArrayMode, firstIndex, numberOfIndicesToBeRendered);
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}
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#endif // #ifndef DRAW_CPP
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