156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
#include <cstdint>
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#include <memory>
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#include <vector>
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#include <GL/glew.h>
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#include <cstring>
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#include <glog/logging.h>
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#include <chrono>
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#include <thread>
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#include "glutils.hpp"
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#include "Range.hpp"
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using namespace fmri;
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using namespace std;
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static void handleGLError(GLenum error) {
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switch (error) {
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case GL_NO_ERROR:
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return;
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default:
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cerr << "OpenGL error: " << (const char*) glewGetErrorString(error) << endl;
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}
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}
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static void rescaleSubImages(vector<float>& textureBuffer, int subImages) {
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auto cur = textureBuffer.begin();
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const auto increment = textureBuffer.size() / subImages;
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while (cur != textureBuffer.end()) {
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rescale(cur, cur + increment, 0, 1);
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advance(cur, increment);
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}
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}
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fmri::Texture fmri::loadTexture(DType const *data, int width, int height, int subImages)
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{
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// Load and scale texture
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vector<float> textureBuffer(data, data + (width * height));
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rescaleSubImages(textureBuffer, subImages);
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Texture texture;
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texture.configure(GL_TEXTURE_2D);
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gluBuild2DMipmaps(GL_TEXTURE_2D, GL_LUMINANCE, width, height, GL_LUMINANCE, GL_FLOAT, textureBuffer.data());
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return texture;
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}
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void fmri::changeWindowSize(int w, int h)
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{
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// Prevent a divide by zero, when window is too short
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// (you cant make a window of zero width).
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if (h == 0)
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h = 1;
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float ratio = w * 1.0f / h;
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// Use the Projection Matrix
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glMatrixMode(GL_PROJECTION);
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// Reset Matrix
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glLoadIdentity();
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// Set the viewport to be the entire window
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glViewport(0, 0, w, h);
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// Set the correct perspective.
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gluPerspective(45.0f, ratio, 0.1f, 10000.0f);
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// Get Back to the Modelview
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glMatrixMode(GL_MODELVIEW);
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}
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void fmri::renderText(std::string_view text, int x, int y)
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{
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constexpr auto font = GLUT_BITMAP_HELVETICA_10;
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glRasterPos2i(x, y);
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for (char c : text) {
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if (c == '\n') {
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y += 12;
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glRasterPos2i(x, y);
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} else {
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glutBitmapCharacter(font, c);
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}
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}
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}
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void fmri::checkGLErrors()
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{
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while (auto error = glGetError()) {
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handleGLError(error);
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}
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}
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void fmri::throttleIdleFunc()
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{
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using namespace std::chrono;
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constexpr duration<double, ratio<1, 60>> refreshRate(1);
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static auto lastCalled = steady_clock::now();
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const auto now = steady_clock::now();
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const auto diff = now - lastCalled;
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if (diff < refreshRate) {
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this_thread::sleep_for(refreshRate - diff);
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}
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lastCalled = now;
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}
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void fmri::restorePerspectiveProjection() {
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glMatrixMode(GL_PROJECTION);
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// restore previous projection matrix
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glPopMatrix();
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// get back to modelview mode
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glMatrixMode(GL_MODELVIEW);
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}
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void fmri::setOrthographicProjection() {
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// switch to projection mode
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glMatrixMode(GL_PROJECTION);
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// save previous matrix which contains the
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//settings for the perspective projection
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glPushMatrix();
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// reset matrix
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glLoadIdentity();
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// set a 2D orthographic projection
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gluOrtho2D(0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT), 0);
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// switch back to modelview mode
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glMatrixMode(GL_MODELVIEW);
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}
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void fmri::drawImageTiles(int n, const float *vertexBuffer, const float *textureCoords, const Texture &texture)
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{
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnable(GL_TEXTURE_2D);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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texture.bind(GL_TEXTURE_2D);
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glTexCoordPointer(2, GL_FLOAT, 0, textureCoords);
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glVertexPointer(3, GL_FLOAT, 0, vertexBuffer);
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glDrawArrays(GL_QUADS, 0, n);
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glDisable(GL_TEXTURE_2D);
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glDisableClientState(GL_VERTEX_ARRAY);
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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}
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