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Revert "Revert "feat: shaders cooperation, uniform and colors from vertice""

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This reverts commit 4fed1960da.
This commit is contained in:
Krzysztof Rudnicki 2022-10-19 15:51:07 +02:00
parent 4fed1960da
commit 41331f90fe
7 changed files with 228 additions and 102 deletions
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5
.vscode/settings.json vendored
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@ -77,5 +77,8 @@
"ctime": "cpp",
"ratio": "cpp"
},
"C_Cpp.errorSquiggles": "Disabled"
"C_Cpp.errorSquiggles": "Disabled",
"cSpell.words": [
"VERTICE"
]
}

211
Engine/engine/constants.hpp
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@ -4,106 +4,187 @@
#include <iostream>
#include <string_view>
namespace constants
namespace constants
{
inline constexpr int GLFW_MAJOR_VERSION{3};
inline constexpr int GLFW_MINOR_VERSION{3};
inline constexpr int GLFW_MAJOR_VERSION { 3 };
inline constexpr int GLFW_MINOR_VERSION { 3 };
// best practice is to use inline constexpr std::string_view but glfwCreateWindow takes only char* as input
inline const char *MAIN_WINDOW_NAME{"Match"};
inline constexpr int MAIN_WINDOW_WIDTH{800};
inline constexpr int MAIN_WINDOW_HEIGHT{600};
inline constexpr struct
{
inline const char* MAIN_WINDOW_NAME { "Match" };
inline constexpr int MAIN_WINDOW_WIDTH { 800 };
inline constexpr int MAIN_WINDOW_HEIGHT { 600 };
inline constexpr struct {
GLfloat red = 1.0f;
GLfloat green = 0.0f;
GLfloat blue = 0.0f;
GLfloat alpha = 1.0f;
} RED;
inline constexpr struct
{
inline constexpr struct {
GLfloat red = 1.0f;
GLfloat green = 1.0f;
GLfloat blue = 1.0f;
GLfloat alpha = 1.0f;
} WHITE;
inline constexpr struct
{
inline constexpr struct {
GLfloat red = 0.2f;
GLfloat green = 0.3f;
GLfloat blue = 0.3f;
GLfloat alpha = 1.0f;
} LEARN_OPEN_GL_COLOR;
// we write vertex shader
inline const std::string_view VERTEX_SHADER_OUTPUT_FILE {
"./shaders/vertexShaderOutput.vs"
};
inline const std::string_view VERTEX_FIRST_SHADER {
"./shaders/firstShader.vs"
};
inline const std::string_view VERTEX_WITH_COLOR {
"./shaders/vertexWithColor.vs"
};
inline const std::string_view FRAGMENT_YELLOW {
"./shaders/yellow.fs"
};
inline const std::string_view FRAGMENT_ORANGE {
"./shaders/orange.fs"
};
inline const std::string_view FRAGMENT_COLOR_INPUT {
"./shaders/fragmentColorInput.fs"
};
inline const std::string_view FRAGMENT_UNIFORMS {
"./shaders/fragmentUniforms.fs"
};
// we send output from vertex shader (vertexColor)...
inline const char *VERTEX_SHADER_COLOR { "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"out vec3 vertexColor;\n" // color output to fragment shader
"void main()\n"
"{\n"
" gl_Position = vec4(aPos, 1.0);\n" // we directly give xyz of aPos as an argument
" vertexColor = vec3(0.5, 0.0, 0.0);\n" // dark red color
"}\0" } ;
// we write vertex shader
// version of glsl (since ogl 3.3 same as ogl so we pick 330)
// in this shader we just forward input data to shader output
inline const char *VERTEX_SHADER_SOURCE{"#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0"};
inline const char *VERTEX_SHADER_SOURCE { "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0" } ;
inline const char *VERTEX_SHADER_VERTICE_COLOR { "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n" // position has attribute position 0
"layout (location = 1) in vec3 aColor;\n" // color has attribute position 1
"out vec3 vertexColor;\n" // output a color to fragment shader
"void main()\n"
"{\n"
" gl_Position = vec4(aPos, 1.0);\n"
" vertexColor = aColor;\n"
"}\0" } ;
// ... to fragment shader (vertexColor)
inline const char *FRAGMENT_SHADER_COLOR_FROM_VERTEX {
"#version 330 core\n"
"out vec4 FragColor;\n"
"in vec3 vertexColor;\n" // from vertex
"void main()\n"
"{\n"
"FragColor = vec4(vertexColor, 1.0);\n"
"}\0"
};
// uniforms
inline const char *FRAGMENT_SHADER_UNIFORMS {
"#version 330 core\n"
"out vec4 FragColor;\n"
"uniform vec4 ourColor;\n" // set in OGL code
"void main()\n"
"{\n"
"FragColor = ourColor;\n"
"}\0"
};
// write fragment shader
// we set the color of each pixel to be orange
inline const char *FRAGMENT_SHADER_SOURCE{
inline const char *FRAGMENT_SHADER_SOURCE {
"#version 330 core\n"
"out vec4 FragColor;\n"
"void main()\n"
"{\n"
"FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\0"};
"FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\0"
};
inline const char *FRAGMENT_SHADER_SOURCE_YELLOW{
inline const char *FRAGMENT_SHADER_SOURCE_YELLOW {
"#version 330 core\n"
"out vec4 FragColor;\n"
"void main()\n"
"{\n"
"FragColor = vec4(1.0f, 1.0f, 0.0f, 1.0f);\n"
"}\0"};
"FragColor = vec4(1.0f, 1.0f, 0.0f, 1.0f);\n"
"}\0"
};
// we specify three vertices
// each of them with position in 3d space
// x y z
inline constexpr float TRIANGLE_VERTICES[]{
inline constexpr float TRIANGLE_VERTICES[] {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f};
inline constexpr size_t TRIANGLE_VERTICES_SIZE = {sizeof(TRIANGLE_VERTICES)};
inline constexpr float TRIANGLES_VERTICES[]{
// first triangle
-0.9f, -0.5f, 0.0f, // left
-0.0f, -0.5f, 0.0f, // right
-0.45f, 0.5f, 0.0f, // top
// second triangle
0.0f, -0.5f, 0.0f, // left
0.9f, -0.5f, 0.0f, // right
0.45f, 0.5f, 0.0f // top
0.0f, 0.5f, 0.0f
};
inline constexpr size_t TRIANGLES_VERTICES_SIZE = {sizeof(TRIANGLES_VERTICES)};
inline constexpr size_t TRIANGLE_VERTICES_SIZE = { sizeof(TRIANGLE_VERTICES) };
inline constexpr float TRIANGLE_ONE[]{
inline constexpr float TRIANGLES_VERTICES[] {
// first triangle
-0.9f, -0.5f, 0.0f, // left
-0.0f, -0.5f, 0.0f, // right
-0.45f, 0.5f, 0.0f, // top
};
inline constexpr size_t TRIANGLE_ONE_SIZE = {sizeof(TRIANGLE_ONE)};
inline constexpr float TRIANGLE_TWO[]{
-0.9f, -0.5f, 0.0f, // left
-0.0f, -0.5f, 0.0f, // right
-0.45f, 0.5f, 0.0f, // top
// second triangle
0.0f, -0.5f, 0.0f, // left
0.9f, -0.5f, 0.0f, // right
0.45f, 0.5f, 0.0f // top
0.0f, -0.5f, 0.0f, // left
0.9f, -0.5f, 0.0f, // right
0.45f, 0.5f, 0.0f // top
};
inline constexpr size_t TRIANGLE_TWO_SIZE = {sizeof(TRIANGLE_TWO)};
inline constexpr size_t TRIANGLES_VERTICES_SIZE = { sizeof(TRIANGLES_VERTICES) };
inline constexpr float TRIANGLE_ONE[] {
// first triangle
-0.9f, -0.5f, 0.0f, // left
-0.0f, -0.5f, 0.0f, // right
-0.45f, 0.5f, 0.0f, // top
};
inline constexpr size_t TRIANGLE_ONE_SIZE = { sizeof(TRIANGLE_ONE) };
inline constexpr float TRIANGLE_TWO[] {
// second triangle
0.0f, -0.5f, 0.0f, // left
0.9f, -0.5f, 0.0f, // right
0.45f, 0.5f, 0.0f // top
};
inline constexpr size_t TRIANGLE_TWO_SIZE = { sizeof(TRIANGLE_TWO) };
inline constexpr float TRIANGLE_COLORS[] {
// positions // colors
0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, // bottom left
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f // top
};
inline constexpr size_t TRIANGLE_COLORS_SIZE = { sizeof(TRIANGLE_COLORS) };
// compare with square done with only vertices:
/*
@ -111,31 +192,31 @@ namespace constants
// first triangle
0.5f, 0.5f, 0.0f, // top right
0.5f, -0.5f, 0.0f, // bottom right
-0.5f, 0.5f, 0.0f, // top left
-0.5f, 0.5f, 0.0f, // top left
// second triangle
0.5f, -0.5f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f // top left
};
bottom right and top left is specified twice !
bottom right and top left is specified twice !
*/
inline constexpr float SQUARE_VERTICES[]{
0.5f, 0.5f, 0.0f, // top right
inline constexpr float SQUARE_VERTICES[] {
0.5f, 0.5f, 0.0f, // top right
0.5f, -0.5f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f // top left
-0.5f, -0.5f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f // top left
};
inline constexpr unsigned int SQUARE_INDICES[]{
0, 1, 3, // first triangle
1, 2, 3 // second triangle
inline constexpr unsigned int SQUARE_INDICES[] {
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
inline constexpr size_t SQUARE_INDICES_SIZE = {sizeof(SQUARE_INDICES)};
inline constexpr size_t SQUARE_INDICES_SIZE = { sizeof(SQUARE_INDICES) };
inline constexpr size_t SQUARE_VERTICES_SIZE = {sizeof(SQUARE_VERTICES)};
inline constexpr size_t SQUARE_VERTICES_SIZE = { sizeof(SQUARE_VERTICES) };
inline constexpr int MAX_DRAW_CALL = {4};
inline constexpr int MAX_DRAW_CALL = { 7 };
}

46
Engine/engine/draw.cpp
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@ -3,6 +3,7 @@
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <cmath>
#include "draw.hpp"
#include "renderLoop.hpp"
#include "shaders.hpp"
@ -14,18 +15,27 @@ int drawFigure(const int whatToDraw)
switch (whatToDraw)
{
case 0:
return drawTriangle(constants::TRIANGLE_VERTICES, constants::TRIANGLE_VERTICES_SIZE, constants::VERTEX_SHADER_SOURCE, constants::FRAGMENT_SHADER_SOURCE);
return drawTriangle(constants::TRIANGLE_VERTICES, constants::TRIANGLE_VERTICES_SIZE, constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_ORANGE, false);
case 1:
return drawSquare(constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_ORANGE);
case 2:
// Try to draw 2 triangles next to each other using glDrawArrays by adding more vertices to your data.
return drawTriangle(constants::TRIANGLES_VERTICES, constants::TRIANGLES_VERTICES_SIZE, constants::VERTEX_SHADER_SOURCE, constants::FRAGMENT_SHADER_SOURCE);
return drawTriangle(constants::TRIANGLES_VERTICES, constants::TRIANGLES_VERTICES_SIZE, constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_ORANGE, false);
case 3:
// Now create the same 2 triangles using two different VAOs and VBOs for their data
return (drawTriangle(constants::TRIANGLE_ONE, constants::TRIANGLE_ONE_SIZE, constants::VERTEX_SHADER_SOURCE, constants::FRAGMENT_SHADER_SOURCE) == -1 || drawTriangle(constants::TRIANGLE_TWO, constants::TRIANGLE_TWO_SIZE, constants::VERTEX_SHADER_SOURCE, constants::FRAGMENT_SHADER_SOURCE) == -1);
case constants::MAX_DRAW_CALL:
return (drawTriangle(constants::TRIANGLE_ONE, constants::TRIANGLE_ONE_SIZE, constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_ORANGE, false) == -1 || drawTriangle(constants::TRIANGLE_TWO, constants::TRIANGLE_TWO_SIZE, constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_ORANGE, false) == -1);
case 4:
// Create two shader programs where the second program uses a different fragment shader that outputs the color yellow; draw both triangles again where one outputs the color yellow
return (drawTriangle(constants::TRIANGLE_ONE, constants::TRIANGLE_ONE_SIZE, constants::VERTEX_SHADER_SOURCE, constants::FRAGMENT_SHADER_SOURCE) == -1 || drawTriangle(constants::TRIANGLE_TWO, constants::TRIANGLE_TWO_SIZE, constants::VERTEX_SHADER_SOURCE, constants::FRAGMENT_SHADER_SOURCE_YELLOW) == -1);
return (drawTriangle(constants::TRIANGLE_ONE, constants::TRIANGLE_ONE_SIZE, constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_ORANGE, false) == -1 || drawTriangle(constants::TRIANGLE_TWO, constants::TRIANGLE_TWO_SIZE, constants::VERTEX_FIRST_SHADER, constants::FRAGMENT_YELLOW, false) == -1);
case 5:
// Get color from vertex shader to fragment shader
return drawTriangle(constants::TRIANGLE_VERTICES, constants::TRIANGLE_VERTICES_SIZE, constants::VERTEX_WITH_COLOR, constants::FRAGMENT_COLOR_INPUT, false);
case 6:
// set color from opengl code to uniform value in fragment shader
return drawTriangle(constants::TRIANGLE_VERTICES, constants::TRIANGLE_VERTICES_SIZE, constants::VERTEX_WITH_COLOR, constants::FRAGMENT_UNIFORMS, false);
case constants::MAX_DRAW_CALL:
// set color from opengl code to uniform value in fragment shader
return drawTriangle(constants::TRIANGLE_COLORS, constants::TRIANGLE_COLORS_SIZE, constants::VERTEX_WITH_COLOR, constants::FRAGMENT_COLOR_INPUT, true);
default:
throw "No function for this draw call";
}
@ -40,8 +50,7 @@ int drawSquare(const std::string_view vertexShaderSource, const std::string_view
copyVerticesMemory(constants::SQUARE_INDICES, constants::SQUARE_INDICES_SIZE, GL_ELEMENT_ARRAY_BUFFER);
// set vertex attribute pointers
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
glEnableVertexAttribArray(0);
configureVertexAttribute(false);
doDrawElements(ourShader, VAO, GL_TRIANGLES, GL_UNSIGNED_INT, std::size(constants::SQUARE_INDICES));
return 0;
@ -55,27 +64,36 @@ void doDrawElements(const Shader Shader, const unsigned int vertexArrayObject, c
glBindVertexArray(0);
}
int drawTriangle(const float triangleVertices[], const size_t triangleVerticesSize, const char *vertexShaderSource, const char *fragmentShaderSource)
int drawTriangle(const float triangleVertices[], const size_t triangleVerticesSize, const std::string_view vertexShaderSource, const std::string_view fragmentShaderSource, const bool colorIncluded)
{
const unsigned int vertexBufferObject = copyVerticesMemory(triangleVertices, triangleVerticesSize, GL_ARRAY_BUFFER);
Shader ourShader(vertexShaderSource, fragmentShaderSource);
configureVertexAttribute();
const unsigned int vertexArrayObject = generateBindVAO();
copyVerticesArray(vertexBufferObject, triangleVertices, triangleVerticesSize, GL_ARRAY_BUFFER);
// set vertex attribute pointers
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
glEnableVertexAttribArray(0);
doDrawArrays(shaderProgram, vertexArrayObject, GL_TRIANGLES, 0, triangleVerticesSize);
configureVertexAttribute(colorIncluded);
doDrawArrays(ourShader, vertexArrayObject, GL_TRIANGLES, 0, triangleVerticesSize);
return 0;
}
void doDrawArrays(const unsigned int shaderProgram, const unsigned int vertexArrayObject, const GLenum drawArrayMode, const int firstIndex, const unsigned int numberOfIndicesToBeRendered)
GLfloat updateUniformColor()
{
// update the uniform color
const float timeValue = glfwGetTime(); // retrieve running time
const float greenValue = sin(timeValue) / 2.0f + 0.5f; // vary the color from 0.0 to 1.0 using sin
return greenValue;
}
void doDrawArrays(const Shader Shader, const unsigned int vertexArrayObject, const GLenum drawArrayMode, const int firstIndex, const unsigned int numberOfIndicesToBeRendered)
{
// use shader program to render an object
glUseProgram(shaderProgram);
Shader.use();
Shader.setFloat("ourColor", updateUniformColor());
glBindVertexArray(vertexArrayObject);
// From left:
// primitive type we want to draw

7
Engine/engine/draw.hpp
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@ -6,7 +6,8 @@
int drawFigure(const int whatToDraw);
int drawSquare(const std::string_view vertexShaderSource, const std::string_view fragmentShaderSource);
void doDrawElements(const unsigned int shaderProgram, const unsigned int vertexArrayObject, const GLenum drawArrayMode, const GLenum drawType, const int numberOfElementsToDraw);
int drawTriangle(const float triangleVertices[], const size_t triangleVerticesSize, const char *vertexShaderSource, const char *fragmentShaderSource);
void doDrawArrays(const unsigned int shaderProgram, const unsigned int vertexArrayObject, const GLenum drawArrayMode, const int firstIndex, const unsigned int numberOfIndicesToBeRendered);
int drawTriangle(const float triangleVertices[], const size_t triangleVerticesSize, const std::string_view vertexShaderSource, const std::string_view fragmentShaderSource, const bool colorIncluded);
GLfloat updateUniformColor();
void doDrawArrays(const Shader Shader, const unsigned int vertexArrayObject, const GLenum drawArrayMode, const int firstIndex, const unsigned int numberOfIndicesToBeRendered );
#endif
#endif

BIN
Engine/engine/match
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Binary file not shown.

59
Engine/engine/renderLoop.cpp
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@ -11,8 +11,10 @@
int processInput(GLFWwindow *window, const int whatToDraw)
{
static bool locked = false;
const bool PRESSED_CHANGE_DRAW = (glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS || glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS);
static bool lockedLeft = false;
static bool lockedRight = false;
const bool PRESSED_CHANGE_LEFT = (glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS);
const bool PRESSED_CHANGE_RIGHT = (glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS);
// glfwGetKey takes window and key as an input and checks is currently being pressed
// if the user pressed escape we close window
@ -20,12 +22,19 @@ int processInput(GLFWwindow *window, const int whatToDraw)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_C) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if ( !PRESSED_CHANGE_DRAW )
locked = 0;
if ( PRESSED_CHANGE_DRAW && locked == 0 )
if ( !PRESSED_CHANGE_LEFT )
lockedLeft = 0;
if ( !PRESSED_CHANGE_RIGHT )
lockedRight = 0;
if ( PRESSED_CHANGE_RIGHT && lockedRight == 0 )
{
locked = 1;
lockedRight = 1;
return (whatToDraw == constants::MAX_DRAW_CALL ? 0 : whatToDraw + 1);
}
if ( PRESSED_CHANGE_LEFT && lockedLeft == 0 )
{
lockedLeft = 1;
return (whatToDraw == 0 ? constants::MAX_DRAW_CALL : whatToDraw - 1);
}
return whatToDraw;
}
@ -69,21 +78,35 @@ unsigned int copyVerticesMemory(const unsigned int vertices[], const size_t size
return vertexBufferObject;
}
void configureVertexAttribute()
void configureVertexAttribute(const bool colorIncluded)
{
// specify how OGL interprets vertex data
// From left:
// which vertex attribute we configure (from shader source code layout (location = 0))
// size of vertex attribute (we use vec3 so it contains 3 values)
// type of data of which vec consists of
// should data be normalized, (useful when we use integer data)
// space between vertex attributes, each position data is 3 times the size of float
// offset of where position data begins in buffer
// see: https://learnopengl.com/img/getting-started/vertex_attribute_pointer.png
// vertex attribute data take data from memory managed by VBO bound to GL_ARRAY_BUFFER
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
/* specify how OGL interprets vertex data
From left:
which vertex attribute we configure (from shader source code layout (location = 0))
size of vertex attribute (we use vec3 so it contains 3 values)
type of data of which vec consists of
should data be normalized, (useful when we use integer data)
space between vertex attributes, each position data is 3 times the size of float
offset of where position data begins in buffer
see: https://learnopengl.com/img/getting-started/vertex_attribute_pointer.png
vertex attribute data take data from memory managed by VBO bound to GL_ARRAY_BUFFER */
if(!colorIncluded) {
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
// enable vertex attribute
glEnableVertexAttribArray(0);
return;
}
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
// enable vertex attribute
glEnableVertexAttribArray(0);
/* we change attribute location, color values have size of 3 floats
we do not normalize values, in order to get the next attribute value in data array we need to move 6 floats, (3 for position and 3 for color), we also need to specify an offset, first we have position then after 3 floats we have color
https://learnopengl.com/img/getting-started/vertex_attribute_pointer_interleaved.png */
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)(3* sizeof(float)));
// enable vertex attribute
glEnableVertexAttribArray(1);
}
unsigned int generateBindVAO()

2
Engine/engine/renderLoop.hpp
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@ -7,7 +7,7 @@ void renderLoop(GLFWwindow *window);
int renderLoopInside(GLFWwindow *window, int whatToDraw);
void copyVerticesArray(unsigned int vertexBufferObject, const float vertices[], const size_t sizeOfVertices, const GLenum boundBufferTarget);
unsigned int generateBindVAO();
void configureVertexAttribute();
void configureVertexAttribute(const bool colorIncluded);
int processInput(GLFWwindow *window, int whatToDraw);
unsigned int copyVerticesMemory(const float vertices[], const size_t sizeOfVertices, const GLenum boundBufferTarget);