105 lines
2.9 KiB
C++
105 lines
2.9 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 "glutils.hpp"
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using namespace fmri;
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using namespace std;
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/**
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* Utility function to send OpenGL info dumps to the log
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*
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* @param object The GLObject to get info for
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* @param glGet__iv The function to query log length with
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* @param glGet__InfoLog The function to get the log with
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*/
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static void show_info_log(
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GLuint object,
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PFNGLGETSHADERIVPROC glGet__iv,
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PFNGLGETSHADERINFOLOGPROC glGet__InfoLog
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)
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{
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GLint log_length;
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glGet__iv(object, GL_INFO_LOG_LENGTH, &log_length);
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unique_ptr<char[]> log(new char[log_length]);
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glGet__InfoLog(object, log_length, nullptr, log.get());
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LOG(INFO) << log.get() << endl;
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}
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GLuint fmri::loadTexture(DType const *data, int width, int height)
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{
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// Load and scale texture
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vector<DType> textureBuffer(data, data + (width * height));
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rescale(textureBuffer.begin(), textureBuffer.end(), 0, 1);
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const float color[] = {0, 0, 0}; // Background color for textures.
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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// Set up (lack of) repetition
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, color);
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static_assert(sizeof(DType) == 4); // verify data type for texture.
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glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, 2, 2, 0, GL_R32F, GL_FLOAT, textureBuffer.data());
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// Set up texture scaling
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // Use mipmapping for scaling down
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); // Use nearest pixel when scaling up.
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glGenerateMipmap(GL_TEXTURE_2D);
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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, 100.0f);
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// Get Back to the Modelview
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glMatrixMode(GL_MODELVIEW);
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}
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GLuint fmri::compileShader(GLenum type, char const *source)
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{
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GLuint shader = glCreateShader(type);
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auto length = static_cast<GLint>(strlen(source));
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GLint compileOK;
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glShaderSource(shader, 1, &source, &length);
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glCompileShader(shader);
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glGetShaderiv(shader, GL_COMPILE_STATUS, &compileOK);
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if (!compileOK) {
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LOG(WARNING) << "Failed to compile " << source << endl;
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show_info_log(shader, glGetShaderiv, glGetShaderInfoLog);
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glDeleteShader(shader);
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abort();
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}
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}
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