mirror of
https://github.com/Relintai/programming_tutorials.git
synced 2025-05-01 22:17:59 +02:00
675 lines
13 KiB
C++
675 lines
13 KiB
C++
#include <stdio.h>
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#define SDL_MAIN_HANDLED
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#include <SDL2/SDL.h>
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#ifdef __unix__
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#include <GL/gl.h>
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#endif
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#ifdef _WIN64
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#include <glad/glad.h>
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#endif
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#ifdef __EMSCRIPTEN__
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#include <emscripten.h>
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#endif
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SDL_Window *window;
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SDL_GLContext context;
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bool running = true;
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void first_2d_triangle() {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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//immediate mode
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glBegin(GL_TRIANGLES);
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glVertex2f(0.0, 0.5);
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glVertex2f(0.5, -0.5);
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glVertex2f(-0.5, -0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_2d_triangle_colored() {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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//immediate mode
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0);
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glVertex2f(0.0, 0.5);
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glColor3f(0, 1, 0);
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glVertex2f(0.5, -0.5);
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glColor3f(0, 0, 1);
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glVertex2f(-0.5, -0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_2d_quad() {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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//immediate mode
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glBegin(GL_QUADS);
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glVertex2f(0.5, 0.5);
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glVertex2f(0.5, -0.5);
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glVertex2f(-0.5, -0.5);
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glVertex2f(-0.5, 0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_2d_quad_colored() {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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//immediate mode
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glBegin(GL_QUADS);
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glColor3f(1, 0, 0);
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glVertex2f(0.5, 0.5);
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glColor3f(0.5, 0.5, 0.5);
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glVertex2f(0.5, -0.5);
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glColor3f(0, 1, 0);
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glVertex2f(-0.5, -0.5);
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glColor3f(0, 0, 1);
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glVertex2f(-0.5, 0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_3d_triangle() {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glBegin(GL_TRIANGLES);
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glVertex3f(0, 0.5, 0);
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glVertex3f(0.5, -0.5, 0);
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glVertex3f(-0.5, -0.5, 0);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_3d_triangle_color() {
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 1, 0);
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glVertex3f(0.5, -0.5, 0);
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glColor3f(0,0,1);
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glVertex3f(-0.5, -0.5, 0);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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float c3dc_rot = 0;
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void first_3d_triangle_color_rotated() {
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c3dc_rot += 1;
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.5, 0, 0);
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glRotatef(c3dc_rot, 0, 1, 0);
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 1, 0);
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glVertex3f(0.5, -0.5, 0);
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glColor3f(0,0,1);
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glVertex3f(-0.5, -0.5, 0);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_3d_triangle_color_rotated_face_culling() {
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c3dc_rot += 1;
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRotatef(c3dc_rot, 0, 1, 0);
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glEnable(GL_CULL_FACE);
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//alap
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//glCullFace(GL_BACK);
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//glCullFace(GL_FRONT);
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//glCullFace(GL_FRONT_AND_BACK);
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//Winding order
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//alap:
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//glFrontFace(GL_CCW);
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//glFrontFace(GL_CW);
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(0,0,1);
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glVertex3f(-0.5, -0.5, 0);
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glColor3f(0, 1, 0);
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glVertex3f(0.5, -0.5, 0);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_3d_cone() {
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c3dc_rot += 1;
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//Ebben a példában a -z jön a kamera fele (alapbeállítás)
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRotatef(c3dc_rot, 0, 1, 0);
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glEnable(GL_CULL_FACE);
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glEnable(GL_DEPTH_TEST);
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glBegin(GL_TRIANGLES);
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//eleje
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glColor3f(1, 0, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(1,0,0);
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glVertex3f(-0.5, -0.5, -0.5);
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glColor3f(1, 0, 0);
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glVertex3f(0.5, -0.5, -0.5);
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//bal
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glColor3f(0, 1, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, -0.5, 0.5);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, -0.5, -0.5);
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//jobb
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glColor3f(0, 0, 1);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 0, 1);
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glVertex3f(0.5, -0.5, -0.5);
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glColor3f(0, 0, 1);
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glVertex3f(0.5, -0.5, 0.5);
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//hátulja
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glColor3f(1, 1, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(1, 1, 0);
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glVertex3f(0.5, -0.5, 0.5);
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glColor3f(1, 1, 0);
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glVertex3f(-0.5, -0.5, 0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_3d_cone_ortho() {
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c3dc_rot += 1;
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//Ebben a példában a -z jön a kamera fele (alapbeállítás)
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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//alapbeállítás:
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//glOrtho(-1, 1, -1, 1, 1, -1);
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// glOrtho(-2, 2, -1, 1, 1, -1);
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// glOrtho(-1, 1, -2, 2, 1, -1);
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//glOrtho(-1, 1, -0.75, 0.75, 1, -1);
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//glTranslatef(0, 1, 0);
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//glTranslatef(1, 0, 0);
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glOrtho(-1.33, 1.33, -1, 1, 1, -1);
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//glOrtho(-1.33, 1.33, -1, 1, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRotatef(c3dc_rot, 0, 1, 0);
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glEnable(GL_CULL_FACE);
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glEnable(GL_DEPTH_TEST);
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glBegin(GL_TRIANGLES);
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//eleje
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glColor3f(1, 0, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(1,0,0);
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glVertex3f(-0.5, -0.5, -0.5);
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glColor3f(1, 0, 0);
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glVertex3f(0.5, -0.5, -0.5);
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//bal
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glColor3f(0, 1, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, -0.5, 0.5);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, -0.5, -0.5);
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//jobb
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glColor3f(0, 0, 1);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 0, 1);
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glVertex3f(0.5, -0.5, -0.5);
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glColor3f(0, 0, 1);
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glVertex3f(0.5, -0.5, 0.5);
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//hátulja
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glColor3f(1, 1, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(1, 1, 0);
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glVertex3f(0.5, -0.5, 0.5);
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glColor3f(1, 1, 0);
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glVertex3f(-0.5, -0.5, 0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void first_3d_cone_perspective() {
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c3dc_rot += 1;
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//Ebben a példában a +z jön a kamera fele (alapbeállítás)
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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//glFrustum(-1, 1, -1, 1, 1, 10);
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glFrustum(-1, 1, -0.75, 0.75, 1, 10);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0, 0, -2);
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glRotatef(c3dc_rot, 0, 1, 0);
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glEnable(GL_CULL_FACE);
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glEnable(GL_DEPTH_TEST);
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glBegin(GL_TRIANGLES);
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//eleje
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glColor3f(1, 0, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(1,0,0);
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glVertex3f(-0.5, -0.5, 0.5);
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glColor3f(1, 0, 0);
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glVertex3f(0.5, -0.5, 0.5);
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//bal
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glColor3f(0, 1, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, -0.5, -0.5);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, -0.5, 0.5);
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//jobb
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glColor3f(0, 0, 1);
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glVertex3f(0, 0.5, 0);
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glColor3f(0, 0, 1);
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glVertex3f(0.5, -0.5, 0.5);
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glColor3f(0, 0, 1);
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glVertex3f(0.5, -0.5, -0.5);
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//hátulja
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glColor3f(1, 1, 0);
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glVertex3f(0, 0.5, 0);
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glColor3f(1, 1, 0);
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glVertex3f(0.5, -0.5, -0.5);
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glColor3f(1, 1, 0);
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glVertex3f(-0.5, -0.5, -0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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float box_tris_rot = 0;
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bool box_tris_rot_dir = false;
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void box_tris() {
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if (box_tris_rot_dir)
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box_tris_rot += 0.5;
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else
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box_tris_rot -= 0.5;
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if (box_tris_rot > 90 || box_tris_rot < 0)
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box_tris_rot_dir = !box_tris_rot_dir;
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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//glFrustum(-1, 1, -0.75, 0.75, 1, 10);
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glTranslatef(0, 0.1, 0);
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glOrtho(-2, 2, -1.5, 1.5, -10, 10);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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//glTranslatef(0, 0, -2);
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glRotatef(30, 1, 0, 0);
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glRotatef(box_tris_rot, 0, 1, 0);
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glEnable(GL_CULL_FACE);
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glEnable(GL_DEPTH_TEST);
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0);
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glVertex3f(-0.5, 0.5, 0.5);
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glVertex3f(-0.5, -0.5, 0.5);
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glVertex3f(0.5, -0.5, 0.5);
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glColor3f(0.5, 0, 0);
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glVertex3f(0.5, -0.5, 0.5);
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glVertex3f(0.5, 0.5, 0.5);
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glVertex3f(-0.5, 0.5, 0.5);
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glColor3f(0, 1, 0);
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glVertex3f(-0.5, 0.5, -0.5);
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glVertex3f(-0.5, -0.5, -0.5);
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glVertex3f(-0.5, 0.5, 0.5);
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glColor3f(0, 0.5, 0);
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glVertex3f(-0.5, 0.5, 0.5);
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glVertex3f(-0.5, -0.5, -0.5);
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glVertex3f(-0.5, -0.5, 0.5);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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void box_tris_lights() {
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if (box_tris_rot_dir)
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box_tris_rot += 0.5;
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else
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box_tris_rot -= 0.5;
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if (box_tris_rot > 90 || box_tris_rot < 0)
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box_tris_rot_dir = !box_tris_rot_dir;
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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float light1_ambient[] = { 0, 0, 0, 1 };
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float light1_diffuse[] = { 1, 1, 1, 1 };
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float light1_specular[] = { 1, 1, 1, 1 };
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float light1_pos[] = { -0.5, 1, 2 };
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glLightfv(GL_LIGHT0, GL_AMBIENT, light1_ambient);
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glLightfv(GL_LIGHT0, GL_DIFFUSE, light1_diffuse);
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glLightfv(GL_LIGHT0, GL_SPECULAR, light1_specular);
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glLightfv(GL_LIGHT0, GL_POSITION, light1_pos);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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//glFrustum(-1, 1, -0.75, 0.75, 1, 10);
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glTranslatef(0, 0.1, 0);
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glOrtho(-2, 2, -1.5, 1.5, -10, 10);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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//glTranslatef(0, 0, -2);
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glRotatef(30, 1, 0, 0);
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glRotatef(box_tris_rot, 0, 1, 0);
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glEnable(GL_CULL_FACE);
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glEnable(GL_DEPTH_TEST);
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0);
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glNormal3f(0, 0, 1);
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glVertex3f(-0.5, 0.5, 0.5);
|
|
glNormal3f(0, 0, 1);
|
|
glVertex3f(-0.5, -0.5, 0.5);
|
|
glNormal3f(0, 0, 1);
|
|
glVertex3f(0.5, -0.5, 0.5);
|
|
|
|
glColor3f(0.5, 0, 0);
|
|
|
|
glNormal3f(0, 0, 1);
|
|
glVertex3f(0.5, -0.5, 0.5);
|
|
glNormal3f(0, 0, 1);
|
|
glVertex3f(0.5, 0.5, 0.5);
|
|
glNormal3f(0, 0, 1);
|
|
glVertex3f(-0.5, 0.5, 0.5);
|
|
|
|
glColor3f(0, 1, 0);
|
|
|
|
glNormal3f(-1, 0, 0);
|
|
glVertex3f(-0.5, 0.5, -0.5);
|
|
glNormal3f(-1, 0, 0);
|
|
glVertex3f(-0.5, -0.5, -0.5);
|
|
glNormal3f(-1, 0, 0);
|
|
glVertex3f(-0.5, 0.5, 0.5);
|
|
|
|
glColor3f(0, 0.5, 0);
|
|
|
|
glNormal3f(-1, 0, 0);
|
|
glVertex3f(-0.5, 0.5, 0.5);
|
|
glNormal3f(-1, 0, 0);
|
|
glVertex3f(-0.5, -0.5, -0.5);
|
|
glNormal3f(-1, 0, 0);
|
|
glVertex3f(-0.5, -0.5, 0.5);
|
|
|
|
glEnd();
|
|
|
|
SDL_GL_SwapWindow(window);
|
|
}
|
|
|
|
int current_demo = 12;
|
|
|
|
//gameloop
|
|
void handle_frame() {
|
|
//handle input
|
|
SDL_Event current_evevnt;
|
|
|
|
while(SDL_PollEvent(¤t_evevnt)) {
|
|
if (current_evevnt.type == SDL_QUIT) {
|
|
running = false;
|
|
}
|
|
}
|
|
|
|
//update world
|
|
//most ez nem kell
|
|
|
|
//render
|
|
switch (current_demo) {
|
|
case 0:
|
|
first_2d_triangle();
|
|
break;
|
|
case 1:
|
|
first_2d_triangle_colored();
|
|
break;
|
|
case 2:
|
|
first_2d_quad();
|
|
break;
|
|
case 3:
|
|
first_2d_quad_colored();
|
|
break;
|
|
case 4:
|
|
first_3d_triangle();
|
|
break;
|
|
case 5:
|
|
first_3d_triangle_color();
|
|
break;
|
|
case 6:
|
|
first_3d_triangle_color_rotated();
|
|
break;
|
|
case 7:
|
|
first_3d_triangle_color_rotated_face_culling();
|
|
break;
|
|
case 8:
|
|
first_3d_cone();
|
|
break;
|
|
case 9:
|
|
first_3d_cone_ortho();
|
|
break;
|
|
case 10:
|
|
first_3d_cone_perspective();
|
|
break;
|
|
case 11:
|
|
box_tris();
|
|
break;
|
|
case 12:
|
|
box_tris_lights();
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
SDL_SetMainReady();
|
|
int error = SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);
|
|
|
|
if (error) {
|
|
SDL_Log("SDL_Init: %s", SDL_GetError());
|
|
|
|
return 1;
|
|
}
|
|
|
|
//Use OpenGl 2.1
|
|
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
|
|
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
|
|
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
|
|
|
|
window = SDL_CreateWindow("SDL + OpenGL", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
|
|
|
|
if (!window) {
|
|
SDL_Log("SDL_CreateWindow: %s", SDL_GetError());
|
|
|
|
return 1;
|
|
}
|
|
|
|
context = SDL_GL_CreateContext(window);
|
|
|
|
#ifdef _WIN64
|
|
gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress);
|
|
#endif
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
emscripten_set_main_loop(handle_frame, 0, 1);
|
|
#else
|
|
|
|
while (running) {
|
|
handle_frame();
|
|
}
|
|
#endif
|
|
|
|
printf("%s\n", glGetString(GL_VERSION));
|
|
|
|
SDL_DestroyWindow(window);
|
|
|
|
window = nullptr;
|
|
|
|
SDL_Quit();
|
|
|
|
return 0;
|
|
} |