Furtrum and quad.
This commit is contained in:
CRy386i
parent
238882257b
commit
c646198aa8
2 changed files with 67 additions and 34 deletions
97
main.c
97
main.c
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@ -14,6 +14,8 @@ SDL_GLContext glcontext = NULL;
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GLuint program;
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GLuint vbo;
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GLuint ibo;
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GLuint projMatrLoc;
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static double FPS = INITIAL_FPS;
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static double FrameTime = 1.0 / INITIAL_FPS;
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@ -34,8 +36,32 @@ static void SetTitle ( SDL_Window *window )
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SDL_SetWindowTitle(window, title);
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}
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float toRad ( float deg )
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{
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/* 180 deg = pi */
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/* "deg" deg = x */
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return deg * 3.141593f / 180.0f;
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}
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void resizeWindow ( int width, int height )
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{
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float n = 1.0f; // near
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float f = 3.0f; // far
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float fov = toRad(90); // 90 or 65 for console
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float aspect = width / (float) height;
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float t = n * tanf (fov / 2.0f);
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float r = t * aspect;
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float projMatr[] = {
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n/r, 0, 0, 0,
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0, n/t, 0, 0,
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0, 0, (f+n)/(n-f), -1,
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0, 0, 2.0f*n*f/(n-f), 0
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}; // it's not rows, it's columns, 'GL_FALSE'
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SDL_LogVerbose(SDL_LOG_CATEGORY_RENDER, "n=%.1f f=%.1f fov=%.2f aspect=%.2f t=%.2f r=%.2f\n", n, f, fov, aspect, t, r);
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glUseProgram(program);
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glUniformMatrix4fv(projMatrLoc, 1, GL_FALSE, projMatr);
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glUseProgram(0);
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glViewport(0, 0, (GLsizei)width, (GLsizei)height);
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}
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@ -144,32 +170,36 @@ void createProgram ( GLuint *shaders, int len )
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void createBuffer ( void )
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{
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GLushort indices[] = {
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0, 1, 2,
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0, 2, 3
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};
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float vertices[] = {
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-1.0f, -1.0f, 1.0f, 1.0f, // left-bottom
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1.0f, -1.0f, 1.0f, 1.0f, // right-bottom
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0.0f, 1.0f, -1.0f, 1.0f, // top
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-1.0f, 1.0f, 1.0f, 1.0f, // left-top
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1.0f, 1.0f, 1.0f, 1.0f, // right-top
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0.0f, -1.0f, -1.0f, 1.0f, // bottom
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-1.0f, -1.0f, -2.0f, 1.0f, // left-bottom
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-1.0f, 1.0f, -2.0f, 1.0f, // left-top
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1.0f, 1.0f, -2.0f, 1.0f, // right-top
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1.0f, -1.0f, -2.0f, 1.0f, // right-bottom
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// colours
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1.0f, 0.0f, 0.0f, 1.0f, // red
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0.0f, 1.0f, 0.0f, 1.0f, // green
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0.0f, 0.0f, 1.0f, 1.0f, // blue
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1.0f, 1.0f, 0.0f, 1.0f, // yellow
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1.0f, 0.0f, 1.0f, 1.0f, // purple
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0.0f, 1.0f, 1.1f, 1.0f // aqua
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1.0f, 1.0f, 0.0f, 1.0f // yellow
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};
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glGenBuffers(1, &vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glGenBuffers(1, &ibo);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
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}
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void setUniformLocation ( void )
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{
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/* offsetLoc = glGetUniformLocation(program, "_offset"); */
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projMatrLoc = glGetUniformLocation(program, "projMatr");
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}
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void startShaderProg ( void )
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@ -203,9 +233,10 @@ void _GLBuffer( void )
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glEnableVertexAttribArray(0);
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glEnableVertexAttribArray(1);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);
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glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0, (void *) (6*4*sizeof(float)));
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glDrawArrays(GL_TRIANGLES, 0, 6);
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glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0, (void *) (4*4*sizeof(float)));
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
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glDisableVertexAttribArray(0);
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glDisableVertexAttribArray(1);
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@ -216,10 +247,10 @@ int main( int argc, char* argv[] )
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{
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const int WIDTH = 640;
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const int HEIGHT = 480;
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int delay_threshold = 2;
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int r, g, b, alpha_s, depth_s, stencil_s, dbuffer, GLJ, GLN, GLAccel, GLP = 0;
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double sleep_time = 0;
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double time_counter = 0;
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int delayThreshold = 2;
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int r, g, b, alpha_s, depth_s, stencil_s, dbuffer, glVersionMa, glVersionMi, glAccel, glProfile = 0;
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double sleepTime = 0;
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double timeCounter = 0;
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bool loopShouldStop = false;
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SDL_SetHint(SDL_HINT_RENDER_VSYNC, 0);
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@ -244,7 +275,7 @@ int main( int argc, char* argv[] )
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SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
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PerformancePeriod = 1.0 / SDL_GetPerformanceFrequency();
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time_counter = GetTime();
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timeCounter = GetTime();
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window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
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if (!window) {
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@ -270,10 +301,10 @@ int main( int argc, char* argv[] )
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}
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SDL_LogVerbose(SDL_LOG_CATEGORY_RENDER, "Status: Using GLEW %s\n", glewGetString(GLEW_VERSION));
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SDL_GL_GetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, &GLP);
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SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &GLAccel);
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SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &GLJ);
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SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &GLN);
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SDL_GL_GetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, &glProfile);
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SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &glAccel);
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SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &glVersionMa);
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SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &glVersionMi);
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SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
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SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
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SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
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@ -282,8 +313,8 @@ int main( int argc, char* argv[] )
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SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, &stencil_s);
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SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &dbuffer);
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SDL_LogVerbose(SDL_LOG_CATEGORY_RENDER, "OpenGL Versin: %d.%d, OpenGL Accelerated: %d, OpenGL Profile Mask: %d",
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GLJ, GLN, GLAccel, GLP);
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SDL_LogVerbose(SDL_LOG_CATEGORY_RENDER, "OpenGL Version: %d.%d, OpenGL Accelerated: %d, OpenGL Profile Mask: %d",
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glVersionMa, glVersionMi, glAccel, glProfile);
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SDL_LogVerbose(SDL_LOG_CATEGORY_RENDER, "Red size: %d, Green size: %d, Blue size: %d, Alpha size: %d, Depth size: %d, Stencil size: %d, DoubleBuffer: %d",
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r, g, b, alpha_s, depth_s, stencil_s, dbuffer);
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@ -323,20 +354,20 @@ int main( int argc, char* argv[] )
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panicError();
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}
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sleep_time = time_counter - GetTime();
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if (sleep_time * 1000 > delay_threshold) {
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Uint32 ms = (Uint32)(sleep_time * 1000) - delay_threshold;
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sleepTime = timeCounter - GetTime();
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if (sleepTime * 1000 > delayThreshold) {
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Uint32 ms = (Uint32)(sleepTime * 1000) - delayThreshold;
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SDL_Delay(ms);
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if (time_counter < GetTime()) {
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delay_threshold++;
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SDL_Log("Slept too long. Increased threshold to %u ms", delay_threshold);
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if (timeCounter < GetTime()) {
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delayThreshold++;
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SDL_Log("Slept too long. Increased threshold to %u ms", delayThreshold);
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}
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}
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while (time_counter > GetTime()) {
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while (timeCounter > GetTime()) {
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/* Waiting for the right moment. */
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}
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time_counter += FrameTime;
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timeCounter += FrameTime;
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}
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SDL_DestroyWindow(window);
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@ -3,10 +3,12 @@
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layout(location = 0) in vec4 pos;
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layout(location = 1) in vec4 colour;
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uniform mat4 projMatr;
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smooth out vec4 _colour;
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void main()
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{
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gl_Position = pos;
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gl_Position = projMatr * pos;
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_colour = colour;
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}
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