basic light
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parent
3ea25f83ad
commit
747b4d1e86
3 changed files with 97 additions and 2 deletions
60
main.c
60
main.c
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@ -2,10 +2,13 @@
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#include <stdio.h>
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static void init(void);
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static void resize(int, int);
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static void draw(void);
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static void sortie(void);
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static GLuint _wW = 1280, _wH = 720;
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static GLuint _quadId = 0;
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static GLuint _pId = 0;
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int main(int argc, char **argv) {
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if (!gl4duwCreateWindow(argc, argv, "Demo API8 2023", GL4DW_POS_CENTERED,
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init();
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atexit(sortie);
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gl4duwResizeFunc(resize);
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gl4duwDisplayFunc(draw);
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gl4duwMainLoop();
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return 0;
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}
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void init(void) {}
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void init(void) {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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_quadId = gl4dgGenQuadf();
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_pId = gl4duCreateProgram("<vs>shaders/lights.vs", "<fs>shaders/lights.fs",
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NULL);
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glEnable(GL_DEPTH_TEST);
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gl4duGenMatrix(GL_FLOAT, "proj");
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gl4duGenMatrix(GL_FLOAT, "mod");
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gl4duGenMatrix(GL_FLOAT, "view");
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resize(_wW, _wH);
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}
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void draw(void) {}
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static void resize(int width, int height) {
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GLfloat ratio;
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_wW = width;
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_wH = height;
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glViewport(0, 0, _wW, _wH);
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ratio = (GLfloat)_wW / (GLfloat)_wH;
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gl4duBindMatrix("proj");
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gl4duLoadIdentityf();
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gl4duFrustumf(-1 * ratio, 1 * ratio, -1, 1, 2, 100);
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}
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void draw(void) {
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// Vue
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gl4duBindMatrix("view");
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gl4duLoadIdentityf();
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gl4duLookAtf(0, 0, 4.f, 0, 0, 0, 0.f, 1.f, 0);
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// Scene
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// clang-format off
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GLfloat rouge[] = {1.f, 0.f, 0.f, 1.f},
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blanc[] = {1.f, 1.f, 1.f, 1.f},
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lumpos0[] = {0.f, 0.f, 1.1f, 1.f},
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lumpos[4],
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*mat;
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// clang-format on
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static GLdouble x = 0.;
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lumpos0[0] = 4.f * (float)sin(x);
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gl4duBindMatrix("view");
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mat = (GLfloat *)gl4duGetMatrixData();
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MMAT4XVEC4(lumpos, mat, lumpos0);
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gl4duBindMatrix("mod");
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gl4duLoadIdentityf();
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glUseProgram(_pId);
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gl4duSendMatrices();
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glUniform4fv(glGetUniformLocation(_pId, "scolor"), 1, rouge);
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glUniform4fv(glGetUniformLocation(_pId, "lcolor"), 1, blanc);
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glUniform4fv(glGetUniformLocation(_pId, "lumpos"), 1, lumpos);
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gl4dgDraw(_quadId);
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glUseProgram(0);
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}
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void sortie(void) { gl4duClean(GL4DU_ALL); }
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22
shaders/lights.fs
Normal file
22
shaders/lights.fs
Normal file
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@ -0,0 +1,22 @@
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#version 330
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in vec4 mvpos;
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in vec3 N;
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out vec4 fragColor;
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uniform vec4 scolor;
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uniform vec4 lcolor;
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uniform vec4 lumpos;
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void main() {
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vec4 ambient = 0.15f * lcolor * scolor;
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vec3 Ld = normalize(mvpos.xyz - lumpos.xyz);
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float ild = clamp(dot(normalize(N), -normalize(Ld)), 0, 1);
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vec4 diffus = (ild * lcolor) * scolor;
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vec3 R = reflect(Ld, N);
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vec3 Vue = vec3(0, 0, -1);
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float ils = pow(clamp(dot(R, -Vue), 0, 1), 10);
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vec4 spec = ils * lcolor;
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fragColor = ambient + diffus + spec;
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}
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17
shaders/lights.vs
Normal file
17
shaders/lights.vs
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#version 330
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layout(location = 0) in vec3 pos;
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layout(location = 1) in vec3 normal;
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uniform mat4 proj;
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uniform mat4 mod;
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uniform mat4 view;
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out vec4 mvpos;
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out vec3 N;
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void main() {
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N = (inverse(transpose(mod)) * vec4(normal, 0)).xyz;
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mvpos = view * mod * vec4(pos, 1.0);
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gl_Position = proj * mvpos;
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}
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