u04
This commit is contained in:
parent
56cf731b7f
commit
5b14a6c042
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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
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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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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 +1,16 @@
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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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#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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#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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/**
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* 0.15 0.25
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* | |
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*
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* 0__1 8__9 ___0.6
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* | | | |
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* | | | |
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* | 4_____6 | ___0.05
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* | 5_____7 |
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* | | | |
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* | | | |
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* 2__3 10_11
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*
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* 12__________14 __-0.75
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* 13__________15 __-0.85
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*
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*/
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#define RESTART 345678
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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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GLuint indicesBufferObject;
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GLfloat step = 0.0f;
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GLuint indices[] = {0, 1, 2, 3, RESTART, 4, 6, 5, 7, RESTART, 8, 9, 10, 11, RESTART, 12, 14, 13, 15};
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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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// 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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}
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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 4x4 MATRIX WITH VEC4
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void multiplyV(GLfloat* M, GLfloat* v, GLfloat* out) {
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multiplyAny(M, v, out, 4, 4, 1);
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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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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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// DEFINE POINTS OF LOGO
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size_t size = sizeof(Point) * 16;
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Point* corners = (Point *) malloc(size);
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corners[0].x = -0.25f;
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corners[0].y = 0.6f;
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corners[0].value = 0.0625f;
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corners[1].x = -0.15f;
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corners[1].y = 0.6f;
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corners[1].value = 0.125f;
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corners[2].x = -0.25f;
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corners[2].y = -0.6f;
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corners[2].value = 0.1875f;
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corners[3].x = -0.15f;
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corners[3].y = -0.6f;
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corners[3].value = 0.25f;
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corners[4].x = -0.15f;
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corners[4].y = 0.05f;
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corners[4].value = 0.3125f;
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corners[5].x = -0.15f;
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corners[5].y = -0.05f;
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corners[5].value = 0.375f;
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corners[6].x = 0.15f;
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corners[6].y = 0.05f;
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corners[6].value = 0.4375f;
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corners[7].x = 0.15f;
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corners[7].y = -0.05f;
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corners[7].value = 0.5f;
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corners[8].x = 0.15f;
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corners[8].y = 0.6f;
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corners[8].value = 0.5625f;
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corners[9].x = 0.25f;
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corners[9].y = 0.6f;
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corners[9].value = 0.625f;
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corners[10].x = 0.15f;
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corners[10].y = -0.6f;
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corners[10].value = 0.6875f;
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corners[11].x = 0.25f;
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corners[11].y = -0.6f;
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corners[11].value = 0.75f;
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corners[12].x = -0.25f;
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corners[12].y = -0.75f;
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corners[12].value = 0.8125f;
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corners[13].x = -0.25f;
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corners[13].y = -0.85f;
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corners[13].value = 0.875f;
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corners[14].x = 0.25f;
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corners[14].y = -0.75f;
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corners[14].value = 0.9375f;
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corners[15].x = 0.25f;
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corners[15].y = -0.85f;
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corners[15].value = 1.0f;
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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, corners, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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free(corners);
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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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// 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, &indicesBufferObject);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indicesBufferObject);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
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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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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indicesBufferObject);
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step += 0.005f;
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if (step > 1.0f) step -= 1.0f;
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GLfloat M[16];
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GLfloat scaleFactor = sin(step * 3.14159f * 2) * 0.2f + 1.0f;
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||||
|
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GLfloat scaleBy[4] = {scaleFactor, scaleFactor, 1.0f, 1.0f};
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GLfloat translateBy[4] = {sin(step * 3.14159f * 4.0f), 0.0f, 0.0f, 0.0f};
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identity(M);
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rotateZ(M, M, step * 3.14159f * 2);
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scale(M, M, scaleBy);
|
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translate(M, M, translateBy);
|
||||
|
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glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, M);
|
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|
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glDrawElements(GL_TRIANGLE_STRIP, sizeof(indices) / sizeof(GLuint), GL_UNSIGNED_INT, NULL);
|
||||
}
|
||||
|
||||
void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
|
||||
glViewport(0, 0, width, height);
|
||||
}
|
||||
|
||||
int main(void) {
|
||||
|
||||
// GLfloat A[16];
|
||||
// GLfloat B[16];
|
||||
// GLfloat v[] = {1.0f, 2.0f, 3.0f};
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||||
// GLfloat angle = 1.5f;
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||||
|
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// identity(A);
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// identity(B);
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||||
// multiplyAny(A, B, A, 4, 4, 4);
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||||
|
||||
// translate(A, A, v);
|
||||
// scale(A, A, v);
|
||||
// rotateZ(A, A, angle);
|
||||
|
||||
|
||||
// // DEBUG
|
||||
// // PRINT COLUMN MAJOR MATRIX
|
||||
// for (int i = 0; i < 16; i++) {
|
||||
// if (i != 0 && i % 4 == 0) printf("\n");
|
||||
|
||||
// // cursed stuff to print column major form
|
||||
// printf("%.2f ", A[i % 4 * 4 + i / 4]);
|
||||
// }
|
||||
// printf("\n");
|
||||
// // ------
|
||||
|
||||
// return 0;
|
||||
|
||||
glfwInit();
|
||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
||||
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
|
||||
|
||||
GLFWwindow *window = glfwCreateWindow(600, 600, "Computergrafik 1", NULL, NULL);
|
||||
|
||||
if (!window) {
|
||||
printf("Failed to create window\n");
|
||||
glfwTerminate();
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
|
||||
glfwMakeContextCurrent(window);
|
||||
|
||||
glewInit();
|
||||
|
||||
printf("OpenGL version supported by this platform (%s):\n", glGetString(GL_VERSION));
|
||||
|
||||
|
||||
init();
|
||||
|
||||
while (!glfwWindowShouldClose(window)) {
|
||||
draw();
|
||||
|
||||
glfwSwapBuffers(window);
|
||||
glfwPollEvents();
|
||||
}
|
||||
|
||||
glfwTerminate();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,25 @@
|
|||
unsigned char vertexShader_glsl[] = {
|
||||
0x23, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x33, 0x33, 0x30,
|
||||
0x20, 0x63, 0x6f, 0x72, 0x65, 0x0a, 0x6c, 0x61, 0x79, 0x6f, 0x75, 0x74,
|
||||
0x20, 0x28, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x3d,
|
||||
0x20, 0x30, 0x29, 0x20, 0x69, 0x6e, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20,
|
||||
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|
||||
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|
||||
0x69, 0x6f, 0x6e, 0x20, 0x3d, 0x20, 0x31, 0x29, 0x20, 0x69, 0x6e, 0x20,
|
||||
0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20, 0x76, 0x65, 0x72, 0x74, 0x65, 0x78,
|
||||
0x56, 0x61, 0x6c, 0x75, 0x65, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66, 0x6f,
|
||||
0x72, 0x6d, 0x20, 0x6d, 0x61, 0x74, 0x34, 0x20, 0x74, 0x72, 0x61, 0x6e,
|
||||
0x73, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x3b, 0x0a,
|
||||
0x6f, 0x75, 0x74, 0x20, 0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20, 0x66, 0x72,
|
||||
0x61, 0x67, 0x6d, 0x65, 0x6e, 0x74, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x3b,
|
||||
0x0a, 0x76, 0x6f, 0x69, 0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x29,
|
||||
0x20, 0x7b, 0x0a, 0x09, 0x66, 0x72, 0x61, 0x67, 0x6d, 0x65, 0x6e, 0x74,
|
||||
0x56, 0x61, 0x6c, 0x75, 0x65, 0x20, 0x3d, 0x20, 0x76, 0x65, 0x72, 0x74,
|
||||
0x65, 0x78, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x3b, 0x0a, 0x09, 0x67, 0x6c,
|
||||
0x5f, 0x50, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x3d, 0x20,
|
||||
0x74, 0x72, 0x61, 0x6e, 0x73, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x74, 0x69,
|
||||
0x6f, 0x6e, 0x20, 0x2a, 0x20, 0x76, 0x65, 0x63, 0x34, 0x28, 0x61, 0x50,
|
||||
0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x2c, 0x20, 0x30, 0x2e, 0x30,
|
||||
0x2c, 0x20, 0x31, 0x2e, 0x30, 0x29, 0x3b, 0x0a, 0x7d
|
||||
};
|
||||
unsigned int vertexShader_glsl_len = 261;
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
#version 330 core
|
||||
layout (location = 0) in vec2 aPosition;
|
||||
layout (location = 1) in float vertexValue;
|
||||
uniform mat4 transformation;
|
||||
out float fragmentValue;
|
||||
void main() {
|
||||
fragmentValue = vertexValue;
|
||||
gl_Position = transformation * vec4(aPosition, 0.0, 1.0);
|
||||
}
|
||||
Loading…
Reference in New Issue