u05-1
This commit is contained in:
parent
28177633ed
commit
9608484ce1
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@ -0,0 +1,21 @@
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GLEW_LIBS=$(shell pkgconf glew --libs)
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GLFW_LIBS=$(shell pkgconf glfw3 --libs)
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OBJ = main.o matrixMath.o
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cg1.out: $(OBJ) vertexShader.c fragmentShader.c matrixMath.h
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gcc -o $@ $(OBJ) -lm $(GLEW_LIBS) $(GLFW_LIBS)
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%Shader.c: %Shader.glsl
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xxd -i $? > $@
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main.o: vertexShader.c fragmentShader.c
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%.o: %.c
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gcc -c $<
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run: cg1.out
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./cg1.out
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clean:
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rm vertexShader.c fragmentShader.c cg1.out *.o
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@ -0,0 +1,5 @@
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#version 330 core
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in vec3 color;
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void main() {
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gl_FragColor = vec4(color, 1.0);
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}
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@ -0,0 +1,281 @@
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#include <stdio.h>
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#include <GL/glew.h>
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#include <GLFW/glfw3.h>
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#include "vertexShader.c"
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#include "fragmentShader.c"
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#include "matrixMath.h"
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#define RESTART 345678
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GLuint program;
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GLuint vao;
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GLuint cubeIndicesBufferObject;
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GLfloat aspectRatio = 1.0f;
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GLfloat step = 0.0f;
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GLfloat cube[] = {
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, -1.0f
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};
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GLfloat ground[] = {
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1.0f, 0.0f, 1.0f,
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1.0f, 0.0f, -1.0f,
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-1.0f, 0.0f, 0.0f,
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-1.0f, 0.0f, -1.0f
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};
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GLuint cubeIndices[] = {
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0, 1, 2,
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1, 3, 2,
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1, 7, 3,
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1, 5, 7,
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4, 6, 5,
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5, 6, 7,
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0, 2, 4,
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4, 2, 6,
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7, 6, 3,
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6, 2, 3,
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4, 5, 1,
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4, 1, 0
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};
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GLuint groundIndices[] = {
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0, 1, 2,
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1, 3, 2
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};
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void init(void) {
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// create and compile vertex shader
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GLchar *vertexText = malloc(vertexShader_glsl_len);
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memcpy(vertexText, vertexShader_glsl, vertexShader_glsl_len);
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const GLchar *vertexTextConst = vertexText;
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GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertexShader, 1, &vertexTextConst, &vertexShader_glsl_len);
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glCompileShader(vertexShader);
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GLint status;
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glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
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if (!status) {
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printf("Error compiling vertex shader: ");
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GLchar infoLog[1024];
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glGetShaderInfoLog(vertexShader, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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free(vertexText);
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vertexText = NULL;
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vertexTextConst = NULL;
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// create and compile fragment shader
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GLchar *fragmentText = malloc(fragmentShader_glsl_len);
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memcpy(fragmentText, fragmentShader_glsl, fragmentShader_glsl_len);
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const GLchar *fragmentTextConst = fragmentText;
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GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragmentShader, 1, &fragmentTextConst, &fragmentShader_glsl_len);
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glCompileShader(fragmentShader);
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glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &status);
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if (!status) {
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printf("Error compiling fragment shader: ");
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GLchar infoLog[1024];
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glGetShaderInfoLog(fragmentShader, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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free(fragmentText);
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fragmentText = NULL;
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fragmentTextConst = NULL;
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// create and link shader program
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program = glCreateProgram();
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glAttachShader(program, vertexShader);
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glAttachShader(program, fragmentShader);
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &status);
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if (!status) {
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printf("Error linking program: ");
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GLchar infoLog[1024];
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glGetProgramInfoLog(program, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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glValidateProgram(program);
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glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
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if (!status) {
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printf("Error validating program: ");
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GLchar infoLog[1024];
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glGetProgramInfoLog(program, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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GLuint triangleVertexBufferObject;
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glGenBuffers(1, &triangleVertexBufferObject);
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glBindBuffer(GL_ARRAY_BUFFER, triangleVertexBufferObject);
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glBufferData(GL_ARRAY_BUFFER, sizeof(cube), cube, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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// create vertex array object
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glBindBuffer(GL_ARRAY_BUFFER, triangleVertexBufferObject);
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glVertexAttribPointer(
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0,
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3,
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GL_FLOAT,
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GL_FALSE,
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sizeof(GLfloat) * 3,
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0
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);
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glEnableVertexAttribArray(0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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// ENABLE BACKFACE CULLING
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glFrontFace(GL_CW);
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glEnable(GL_CULL_FACE);
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glEnable(GL_PRIMITIVE_RESTART);
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glPrimitiveRestartIndex(RESTART);
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// DEFINE INDEX ARRAY FOR ELEMENT DRAWING
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glGenBuffers(1, &cubeIndicesBufferObject);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cubeIndicesBufferObject);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(cubeIndices), cubeIndices, GL_STATIC_DRAW);
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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}
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void draw(void) {
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glClear(GL_COLOR_BUFFER_BIT);
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glUseProgram(program);
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glBindVertexArray(vao);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cubeIndicesBufferObject);
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step += 0.002f;
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if (step > 1.0f) step -= 1.0f;
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GLfloat M[16];
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identity(M);
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// GLfloat cameraPosition[3] = {sin(step * 2 * 3.14169f), 0.3f, 0.3f};
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GLfloat cameraPosition[3] = {0.6f, 0.3f, 0.3f};
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GLfloat cubePosition[3] = {0.0f, 0.0f, sin(step * 2 * 3.14159)};
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GLfloat up[3] = {0.0f, 1.0f, 0.0f};
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lookAt(M, cameraPosition, cubePosition, up);
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// GLfloat scaleFactor = sin(step * 3.14159f * 2) * 0.1f + 0.2f;
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GLfloat scaleFactor = 0.5f;
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GLfloat aspectScale[3] = {1.0f / aspectRatio, 1.0f, 1.0f};
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GLfloat scaleBy[3] = {scaleFactor, scaleFactor, scaleFactor};
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// rotateY(M, M, step * 3.14159f * 2);
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// rotateX(M, M, step * 3.14159f * 2 + 1.0f);
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// rotateZ(M, M, step * 3.14159f * 2 + 0.5f);
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scale(M, M, aspectScale);
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// translate(M, M, cubePosition);
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scale(M, M, scaleBy);
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glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, M);
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glDrawElements(GL_TRIANGLES, sizeof(cubeIndices) / sizeof(GLuint), GL_UNSIGNED_INT, NULL);
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}
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void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
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glViewport(0, 0, width, height);
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aspectRatio = (float)width / height;
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}
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int main(void) {
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// GLfloat a[3];
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// GLfloat b[3];
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// vec3Zero(a);
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// vec3Zero(b);
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// a[0] = 1;
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// a[1] = 2;
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// a[2] = 3;
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// vec3Normalise(a, a);
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// printf("%f %f %f\n", a[0], a[1], a[2]);
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// return 0;
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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GLFWwindow *window = glfwCreateWindow(600, 600, "Computergrafik 1", NULL, NULL);
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if (!window) {
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printf("Failed to create window\n");
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glfwTerminate();
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return -1;
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}
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwMakeContextCurrent(window);
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glewInit();
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printf("OpenGL version supported by this platform (%s):\n", glGetString(GL_VERSION));
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init();
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while (!glfwWindowShouldClose(window)) {
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draw();
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwTerminate();
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return 0;
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}
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@ -0,0 +1,242 @@
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <GL/glew.h>
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#include <string.h>
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void vec3Zero(GLfloat* out) {
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for (int i = 0; i < 3; i++) {
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out[i] = 0;
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}
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}
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void vec3Add(GLfloat* out, GLfloat* a, GLfloat* b) {
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for (int i = 0; i < 3; i++) {
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out[i] = a[i] + b[i];
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}
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}
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void vec3Multiply(GLfloat* out, GLfloat* a, GLfloat x) {
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for (int i = 0; i < 3; i++) {
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out[i] = a[i] * x;
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}
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}
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void vec3Subtract(GLfloat* out, GLfloat* a, GLfloat* b) {
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vec3Multiply(out, b, -1);
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vec3Add(out, a, out);
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}
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void vec3Cross(GLfloat* out, GLfloat* a, GLfloat* b) {
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GLfloat result[3];
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result[0] = a[1] * b[2] - a[2] * b[1];
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result[1] = a[2] * b[0] - a[0] * b[2];
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result[2] = a[0] * b[1] - a[1] * b[0];
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memcpy(out, result, sizeof(result));
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}
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GLfloat vec3Length(GLfloat* a) {
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return (GLfloat)sqrt(a[0]*a[0] + a[1]*a[1] + a[2]*a[2]);
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}
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GLfloat vec3Dot(GLfloat* a, GLfloat* b) {
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return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
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}
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void vec3Normalise(GLfloat* out, GLfloat* a) {
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vec3Multiply(out, a, 1 / vec3Length(a));
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}
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// CREATE 4x4 IDENTITY MATRIX
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void identity(GLfloat* out) {
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for (int i = 0; i < 16; i++) {
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out[i] = (i % 4 == i / 4);
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}
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}
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// CREATE 4x4 TRANSLATION MATRIX
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void translation(GLfloat* out, GLfloat* v) {
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identity(out);
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for (int i = 0; i < 3; i++) {
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out[3 * 4 + i] = v[i];
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}
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}
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// CREATE 4x4 SCALING MATRIX
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void scaling(GLfloat* out, GLfloat* v) {
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identity(out);
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for (int i = 0; i < 3; i++) {
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out[i * 5] = v[i];
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}
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}
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// CREATE 4x4 ROTATION MATRIX AROUND Z AXIS
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/* cos a -sin a 0 0
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* sin a cos a 0 0
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* 0 0 1 0
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* 0 0 0 1
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*/
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void rotationZ(GLfloat* out, GLfloat angle) {
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identity(out);
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out[0] = cos(angle);
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out[1] = sin(angle);
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out[4] = -sin(angle);
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out[5] = cos(angle);
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}
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// CREATE 4x4 ROTATION MATRIX AROUND Y AXIS
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void rotationY(GLfloat* out, GLfloat angle) {
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identity(out);
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out[0] = cos(angle);
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out[2] = -sin(angle);
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out[8] = sin(angle);
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out[10] = cos(angle);
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}
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// CREATE 4x4 ROTATION MATRIX AROUND Y AXIS
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void rotationX(GLfloat* out, GLfloat angle) {
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identity(out);
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out[5] = cos(angle);
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out[6] = sin(angle);
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out[9] = -sin(angle);
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out[10] = cos(angle);
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}
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// MULTIPLY ANY TO MATRICES
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void multiplyAny(GLfloat* A, GLfloat* B, GLfloat* out, int wA, int hA, int wB) {
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int sizeOut = hA * wB;
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GLfloat* result = (GLfloat*) malloc(sizeOut * sizeof(GLfloat));
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for (int i = 0; i < sizeOut; i++) {
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result[i] = 0;
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// printf("%d: ", i);
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for (int j = 0; j < wA; j++) {
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// printf("%d : %f ", j * hA + i % hA, A[j * hA + i % hA]);
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result[i] += A[j * hA + i % hA] * B[j + i / hA * wB];
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}
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// printf("\n");
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}
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memcpy(out, result, sizeOut * sizeof(GLfloat));
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free(result);
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result = NULL;
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}
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// MULTIPLY TWO 4x4 MATRICES
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void multiply(GLfloat* A, GLfloat* B, GLfloat* out) {
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multiplyAny(A, B, out, 4, 4, 4);
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}
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// MULTIPLY in WITH TRANSLATION MATRIX OF v
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void translate(GLfloat* out, GLfloat* in, GLfloat* v) {
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GLfloat translationMatrix[16];
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translation(translationMatrix, v);
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multiply(translationMatrix, in, out);
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}
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// MULTIPLY in WITH SCALING MATRIX OF v
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void scale(GLfloat* out, GLfloat* in, GLfloat* v) {
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GLfloat scalingMatrix[16];
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scaling(scalingMatrix, v);
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multiply(scalingMatrix, in, out);
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}
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// MULTIPLY in WITH ROTATION MATRIX OF a AROUND Z AXIS
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void rotateZ(GLfloat* out, GLfloat* in, GLfloat angle) {
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GLfloat rotationMatrix[16];
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rotationZ(rotationMatrix, angle);
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multiply(rotationMatrix, in, out);
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}
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// MULTIPLY in WITH ROTATION MATRIX OF a AROUND Y AXIS
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void rotateY(GLfloat* out, GLfloat* in, GLfloat angle) {
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GLfloat rotationMatrix[16];
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rotationY(rotationMatrix, angle);
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multiply(rotationMatrix, in, out);
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}
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// MULTIPLY in WITH ROTATION MATRIX OF a AROUND X AXIS
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void rotateX(GLfloat* out, GLfloat* in, GLfloat angle) {
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GLfloat rotationMatrix[16];
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rotationX(rotationMatrix, angle);
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multiply(rotationMatrix, in, out);
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}
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void transposeAny(GLfloat* out, GLfloat* in, int w, int h) {
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int size = w * h;
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GLfloat* result = (GLfloat*) malloc(size * sizeof(GLfloat));
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for (int i = 0; i < size; i++) {
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result[i] = in[(i % w) * h + i / w];
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}
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memcpy(out, result, size * sizeof(GLfloat));
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free(result);
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result = NULL;
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}
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void transpose(GLfloat* out, GLfloat* in) {
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transposeAny(out, in, 4, 4);
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}
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void printAny(GLfloat* M, int w, int h) {
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GLfloat* transposed = (GLfloat*) malloc(w * h * sizeof(GLfloat));
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transposeAny(transposed, M, w, h);
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for (int i = 0; i < h; i++) {
|
||||
for (int j = 0; j < w; j++) {
|
||||
printf("%.4f ", transposed[i * w + j]);
|
||||
}
|
||||
printf("\n");
|
||||
}
|
||||
free(transposed);
|
||||
transposed = NULL;
|
||||
}
|
||||
|
||||
void vec3Print(GLfloat* a) {
|
||||
printAny(a, 1, 3);
|
||||
}
|
||||
|
||||
void mat4Print(GLfloat* m) {
|
||||
printAny(m, 4, 4);
|
||||
}
|
||||
|
||||
void lookAt(GLfloat* out, GLfloat* eye, GLfloat* center, GLfloat* up) {
|
||||
|
||||
|
||||
GLfloat n[3];
|
||||
vec3Subtract(n, eye, center);
|
||||
|
||||
GLfloat u[3];
|
||||
vec3Cross(u, up, n);
|
||||
|
||||
GLfloat v[3];
|
||||
vec3Cross(v, n, u);
|
||||
|
||||
|
||||
vec3Normalise(n, n);
|
||||
vec3Normalise(u, u);
|
||||
vec3Normalise(v, v);
|
||||
|
||||
|
||||
GLfloat Mr[16];
|
||||
identity(Mr);
|
||||
|
||||
memcpy(&Mr[0], u, sizeof(GLfloat) * 3);
|
||||
memcpy(&Mr[4], v, sizeof(GLfloat) * 3);
|
||||
memcpy(&Mr[8], n, sizeof(GLfloat) * 3);
|
||||
transpose(Mr, Mr);
|
||||
|
||||
|
||||
GLfloat t[3];
|
||||
vec3Multiply(u, u, -1);
|
||||
vec3Multiply(v, v, -1);
|
||||
vec3Multiply(n, n, -1);
|
||||
|
||||
|
||||
|
||||
t[0] = vec3Dot(u, eye);
|
||||
t[1] = vec3Dot(v, eye);
|
||||
t[2] = vec3Dot(n, eye);
|
||||
|
||||
|
||||
memcpy(&Mr[12], t, sizeof(GLfloat) * 3);
|
||||
|
||||
memcpy(out, Mr, sizeof(GLfloat) * 16);
|
||||
}
|
||||
|
|
@ -0,0 +1,40 @@
|
|||
#ifndef MATRIX_MATH
|
||||
#define MATRIX_MATH
|
||||
|
||||
#include <GL/glew.h>
|
||||
|
||||
void vec3Zero(GLfloat* out);
|
||||
void vec3Add(GLfloat* out, GLfloat* a, GLfloat* b);
|
||||
void vec3Multiply(GLfloat* out, GLfloat* a, GLfloat x);
|
||||
void vec3Subtract(GLfloat* out, GLfloat* a, GLfloat* b);
|
||||
void vec3Cross(GLfloat* out, GLfloat* a, GLfloat* b);
|
||||
void vec3Normalise(GLfloat* out, GLfloat* a);
|
||||
GLfloat vec3Length(GLfloat* a);
|
||||
GLfloat vec3Dot(GLfloat* a, GLfloat* b);
|
||||
|
||||
void identity(GLfloat* out);
|
||||
void translation(GLfloat* out, GLfloat* v);
|
||||
void scaling(GLfloat* out, GLfloat* v);
|
||||
void rotationZ(GLfloat* out, GLfloat angle);
|
||||
void rotationY(GLfloat* out, GLfloat angle);
|
||||
void rotationX(GLfloat* out, GLfloat angle);
|
||||
|
||||
void multiplyAny(GLfloat* A, GLfloat* B, GLfloat* out, int wA, int hA, int wB);
|
||||
void multiply(GLfloat* A, GLfloat* B, GLfloat* out);
|
||||
|
||||
void translate(GLfloat* out, GLfloat* in, GLfloat* v);
|
||||
void scale(GLfloat* out, GLfloat* in, GLfloat* v);
|
||||
void rotateZ(GLfloat* out, GLfloat* in, GLfloat angle);
|
||||
void rotateY(GLfloat* out, GLfloat* in, GLfloat angle);
|
||||
void rotateX(GLfloat* out, GLfloat* in, GLfloat angle);
|
||||
|
||||
void transposeAny(GLfloat* out, GLfloat* in, int w, int h);
|
||||
void transpose(GLfloat* out, GLfloat* in);
|
||||
|
||||
void printAny(GLfloat* M, int w, int h);
|
||||
void vec3Print(GLfloat* a);
|
||||
void mat4Print(GLfloat* m);
|
||||
|
||||
void lookAt(GLfloat* out, GLfloat* eye, GLfloat* center, GLfloat* up);
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
#version 330 core
|
||||
layout (location = 0) in vec3 aPosition;
|
||||
uniform mat4 transformation;
|
||||
out vec3 color;
|
||||
void main() {
|
||||
color = aPosition / 2 + vec3(0.5, 0.5, 0.5);
|
||||
gl_Position = transformation * vec4(aPosition, 1.0);
|
||||
}
|
||||
Loading…
Reference in New Issue