read shaders from glsl file, u03-3
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parent
c8faac75da
commit
5bcda78e4d
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@ -0,0 +1,19 @@
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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
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cg1.out: $(OBJ) vertexShader.c fragmentShader.c
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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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clean:
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rm vertexShader.c fragmentShader.c cg1.out *.o
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@ -0,0 +1,16 @@
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unsigned char fragmentShader_glsl[] = {
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0x23, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x33, 0x33, 0x30,
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0x20, 0x63, 0x6f, 0x72, 0x65, 0x0a, 0x69, 0x6e, 0x20, 0x66, 0x6c, 0x6f,
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0x61, 0x74, 0x20, 0x66, 0x72, 0x61, 0x67, 0x6d, 0x65, 0x6e, 0x74, 0x56,
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0x61, 0x6c, 0x75, 0x65, 0x3b, 0x0a, 0x76, 0x6f, 0x69, 0x64, 0x20, 0x6d,
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0x61, 0x69, 0x6e, 0x28, 0x29, 0x20, 0x7b, 0x0a, 0x09, 0x67, 0x6c, 0x5f,
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0x46, 0x72, 0x61, 0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d, 0x20,
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0x76, 0x65, 0x63, 0x34, 0x28, 0x6d, 0x69, 0x78, 0x28, 0x76, 0x65, 0x63,
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0x33, 0x28, 0x31, 0x2e, 0x30, 0x2c, 0x20, 0x30, 0x2e, 0x30, 0x2c, 0x20,
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0x30, 0x2e, 0x30, 0x29, 0x2c, 0x20, 0x76, 0x65, 0x63, 0x33, 0x28, 0x30,
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0x2e, 0x30, 0x2c, 0x20, 0x31, 0x2e, 0x30, 0x2c, 0x20, 0x30, 0x2e, 0x30,
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0x29, 0x2c, 0x20, 0x66, 0x72, 0x61, 0x67, 0x6d, 0x65, 0x6e, 0x74, 0x56,
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0x61, 0x6c, 0x75, 0x65, 0x29, 0x2c, 0x20, 0x31, 0x2e, 0x30, 0x29, 0x3b,
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0x0a, 0x7d
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};
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unsigned int fragmentShader_glsl_len = 146;
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@ -0,0 +1,5 @@
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#version 330 core
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in float fragmentValue;
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void main() {
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gl_FragColor = vec4(mix(vec3(1.0, 0.0, 0.0), vec3(0.0, 1.0, 0.0), fragmentValue), 1.0);
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}
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@ -0,0 +1,197 @@
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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 <stdlib.h>
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#include <math.h>
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#include <string.h>
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#define NUM_EDGES 20
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#define RADIUS 0.7f
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#define INNER_RADIUS 0.2f
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typedef struct {
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GLfloat x;
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GLfloat y;
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GLfloat value;
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} Point;
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GLuint program;
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GLuint vao;
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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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// 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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// 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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size_t size = sizeof(Point) * (NUM_EDGES + 1) * 2;
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Point* triangleVertices = (Point *) malloc(size);
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float alpha;
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for (int i = 0; i <= NUM_EDGES; i++) {
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alpha = ((float) i) / NUM_EDGES * 3.14159f * 2;
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GLfloat dx = cos(alpha);
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GLfloat dy = sin(alpha);
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triangleVertices[2 * i].x = INNER_RADIUS * cos(alpha);
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triangleVertices[2 * i].y = INNER_RADIUS * sin(alpha);
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// triangleVertices[2 * i].value = ((float)i) / NUM_EDGES;
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triangleVertices[2 * i].value = 1.0f;
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triangleVertices[2 * i + 1].x = RADIUS * cos(alpha);
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triangleVertices[2 * i + 1].y = RADIUS * sin(alpha);
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// triangleVertices[2 * i + 1].value = ((float)i) / NUM_EDGES;
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triangleVertices[2 * i + 1].value = 0.0f;
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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, size, triangleVertices, 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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2,
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GL_FLOAT,
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GL_FALSE,
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sizeof(Point),
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0
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);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(
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1,
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1,
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GL_FLOAT,
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GL_FALSE,
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sizeof(Point),
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(GLvoid*)(2 * sizeof(GLfloat))
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);
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glEnableVertexAttribArray(1);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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glClearColor(0.2f, 0.3f, 0.3f, 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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glDrawArrays(GL_TRIANGLE_STRIP, 0, (NUM_EDGES + 1) * 2);
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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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}
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int main(void) {
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printf("Hello World!\n");
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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(800, 800, "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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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 +1,21 @@
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unsigned char vertexShader_glsl[] = {
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0x23, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x33, 0x33, 0x30,
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0x20, 0x63, 0x6f, 0x72, 0x65, 0x0a, 0x6c, 0x61, 0x79, 0x6f, 0x75, 0x74,
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0x20, 0x28, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x3d,
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0x20, 0x30, 0x29, 0x20, 0x69, 0x6e, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20,
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0x61, 0x50, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x3b, 0x0a, 0x6c,
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0x61, 0x79, 0x6f, 0x75, 0x74, 0x20, 0x28, 0x6c, 0x6f, 0x63, 0x61, 0x74,
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0x69, 0x6f, 0x6e, 0x20, 0x3d, 0x20, 0x31, 0x29, 0x20, 0x69, 0x6e, 0x20,
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0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20, 0x76, 0x65, 0x72, 0x74, 0x65, 0x78,
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0x56, 0x61, 0x6c, 0x75, 0x65, 0x3b, 0x0a, 0x6f, 0x75, 0x74, 0x20, 0x66,
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0x6c, 0x6f, 0x61, 0x74, 0x20, 0x66, 0x72, 0x61, 0x67, 0x6d, 0x65, 0x6e,
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0x74, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x3b, 0x0a, 0x76, 0x6f, 0x69, 0x64,
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0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x29, 0x20, 0x7b, 0x0a, 0x09, 0x66,
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0x72, 0x61, 0x67, 0x6d, 0x65, 0x6e, 0x74, 0x56, 0x61, 0x6c, 0x75, 0x65,
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0x20, 0x3d, 0x20, 0x76, 0x65, 0x72, 0x74, 0x65, 0x78, 0x56, 0x61, 0x6c,
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0x75, 0x65, 0x3b, 0x0a, 0x09, 0x67, 0x6c, 0x5f, 0x50, 0x6f, 0x73, 0x69,
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0x74, 0x69, 0x6f, 0x6e, 0x20, 0x3d, 0x20, 0x76, 0x65, 0x63, 0x34, 0x28,
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0x61, 0x50, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x2c, 0x20, 0x30,
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0x2e, 0x30, 0x2c, 0x20, 0x31, 0x2e, 0x30, 0x29, 0x3b, 0x0a, 0x7d
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};
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unsigned int vertexShader_glsl_len = 215;
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@ -0,0 +1,8 @@
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#version 330 core
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layout (location = 0) in vec2 aPosition;
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layout (location = 1) in float vertexValue;
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out float fragmentValue;
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void main() {
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fragmentValue = vertexValue;
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gl_Position = vec4(aPosition, 0.0, 1.0);
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}
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