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draw_delegate.cpp
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draw_delegate.cpp
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#include "draw_delegate.h"
#include "GLFW/glfw3.h"
#include <stdio.h>
#include <stdlib.h>
#define IN_DRAW_DELEGATE_CPP__
#include "opengl_defines.h"
#define STARTING_SHEETS 16
char * vertexSource =
"#version 120\n"
"attribute vec3 position;\n"
"attribute vec3 colorQ;\n"
"uniform mat4 viewMatrix;\n"
"varying vec3 fragColor;\n"
"void main() {\n"
" fragColor = colorQ;\n"
" gl_Position = viewMatrix * (vec4(position,1.0));\n"
"}\n";
char * fragmentSource =
"#version 120\n"
"varying vec3 fragColor;\n"
"void main(void) {\n"
"gl_FragColor = vec4(clamp(fragColor, vec3(0,0,0), vec3(1,1,1)),1.0);\n"
"}\n";
GLuint shaderProgram;
GLuint positionAttribute;
GLuint colorAttribute;
GLuint viewMatrixUniform;
GLuint pointVBO;
GLuint colorVBO;
namespace {
int DDbufferSize = 10000;
int DDcolorbufferSize = 10000;
};
bool DrawDelegate::SetupOpenGL() {
#ifndef MACOSX
glCreateShader = (PFNGLCREATESHADERPROC) glfwGetProcAddress( "glCreateShader" );
glShaderSource = (PFNGLSHADERSOURCEPROC) glfwGetProcAddress( "glShaderSource" );
glCompileShader = (PFNGLCOMPILESHADERPROC) glfwGetProcAddress( "glCompileShader" );
glGetShaderiv = (PFNGLGETSHADERIVPROC) glfwGetProcAddress( "glGetShaderiv" );
glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC) glfwGetProcAddress( "glGetShaderInfoLog" );
glDeleteShader = (PFNGLDELETESHADERPROC) glfwGetProcAddress( "glDeleteShader" );
glCreateProgram = (PFNGLCREATEPROGRAMPROC) glfwGetProcAddress( "glCreateProgram" );
glAttachShader = (PFNGLATTACHSHADERPROC) glfwGetProcAddress( "glAttachShader" );
glDetachShader = (PFNGLDETACHSHADERPROC) glfwGetProcAddress( "glDetachShader" );
glLinkProgram = (PFNGLLINKPROGRAMPROC) glfwGetProcAddress( "glLinkProgram" );
glGetProgramiv = (PFNGLGETPROGRAMIVPROC) glfwGetProcAddress( "glGetProgramiv" );
glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC) glfwGetProcAddress( "glGetProgramInfoLog" );
glUseProgram = (PFNGLUSEPROGRAMPROC) glfwGetProcAddress( "glUseProgram" );
glDeleteProgram = (PFNGLDELETEPROGRAMPROC) glfwGetProcAddress( "glDeleteProgram" );
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) glfwGetProcAddress( "glGetUniformLocation" );
glUniform1i = (PFNGLUNIFORM1IPROC) glfwGetProcAddress( "glUniform1i" );
glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC) glfwGetProcAddress( "glEnableVertexAttribArray" );
glGetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC) glfwGetProcAddress("glGetAttribLocation");
glGenBuffers = (PFNGLGENBUFFERSPROC) glfwGetProcAddress("glGenBuffers");
glBindBuffer = (PFNGLBINDBUFFERPROC) glfwGetProcAddress("glBindBuffer");
glBufferData = (PFNGLBUFFERDATAPROC) glfwGetProcAddress("glBufferData");
glDeleteBuffers = (PFNGLDELETEBUFFERSPROC) glfwGetProcAddress("glDeleteBuffers");
glBufferSubData = (PFNGLBUFFERSUBDATAPROC) glfwGetProcAddress("glBufferSubData");
glUniform2f = (PFNGLUNIFORM2FPROC) glfwGetProcAddress("glUniform2f");
glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC) glfwGetProcAddress("glVertexAttribPointer");
glUniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC) glfwGetProcAddress("glUniformMatrix4fv");
glUniform3f = (PFNGLUNIFORM3FPROC) glfwGetProcAddress("glUniform3f");
glBlendEquationSeparate = (PFNGLBLENDEQUATIONSEPARATEPROC) glfwGetProcAddress("glBlendEquationSeparate");
if (!(glActiveTexture && glCreateShader && glShaderSource && glCompileShader &&
glGetShaderiv && glGetShaderInfoLog && glDeleteShader && glCreateProgram &&
glAttachShader && glDetachShader && glLinkProgram && glGetProgramiv && glGetProgramInfoLog &&
glUseProgram && glDeleteProgram && glGetUniformLocation && glUniform1i &&
glGetAttribLocation && glGenBuffers && glBindBuffer && glBufferData && glDeleteBuffers && glEnableVertexAttribArray &&
glUniform2f && glVertexAttribPointer && glUniformMatrix4fv && glUniform3f))
return 0;
#endif
//glEnable(GL_TEXTURE_2D);
//glEnable(GL_ALPHA_TEST);
//glAlphaFunc(GL_GREATER,0.1f);
glEnable(GL_DEPTH_TEST);
//glDisable(GL_CULL_FACE);
/* Set up shaders */
GLuint vertexShader, fragmentShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertexShader, 1, (const char**)&vertexSource, NULL);
glShaderSource(fragmentShader, 1,(const char**)&fragmentSource, NULL);
char buffer[10000];
int l;
printf("%s\n%s\n",glGetString(GL_VERSION),glGetString(GL_SHADING_LANGUAGE_VERSION));
/* Compile our shader objects */
glCompileShader(vertexShader);
glCompileShader(fragmentShader);
glGetShaderInfoLog(vertexShader,10000,&l,buffer);
if (buffer[0] != 0) {
//MessageBox(NULL,buffer,"VERTEX", MB_OK);
fprintf(stderr, "VERTEX:\n%s",buffer);
}
glGetShaderInfoLog(fragmentShader,10000,&l,buffer);
if (buffer[0] != 0) {
//MessageBox(NULL,buffer,"FRAGMENT", MB_OK);
fprintf(stderr, "FRAGMENT:\n%s",buffer);
}
shaderProgram = glCreateProgram();
/* Attach our shaders to our program */
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
/* Bind attribute index 0 (shaderAtribute) to in_Position*/
/* "in_Position" will represent "data" array's contents in the vertex shader */
//glBindAttribLocation(shaderProgram, shaderAtribute, "in_Position");
/* Link shader program*/
glLinkProgram(shaderProgram);
GLint status;
glGetProgramiv (shaderProgram, GL_LINK_STATUS, &status);
if (status == GL_FALSE)
{
GLint infoLogLength;
glGetProgramiv(shaderProgram, GL_INFO_LOG_LENGTH, &infoLogLength);
char *strInfoLog = new char[infoLogLength + 1];
glGetProgramInfoLog(shaderProgram, infoLogLength, NULL, strInfoLog);
fprintf(stderr, "Linker failure: %s\n", strInfoLog);
delete[] strInfoLog;
exit(1);
}
/* Set shader program as being actively used */
glUseProgram(shaderProgram);
positionAttribute = glGetAttribLocation(shaderProgram,"position");
colorAttribute = glGetAttribLocation(shaderProgram,"colorQ");
viewMatrixUniform = glGetUniformLocation(shaderProgram, "viewMatrix");
glEnableVertexAttribArray(positionAttribute);
glEnableVertexAttribArray(colorAttribute);
/*-------------------------------------------------------------------------------------------------------*/
glGenBuffers(1, &colorVBO);
glBindBuffer(GL_ARRAY_BUFFER, colorVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDcolorbufferSize, NULL, GL_STREAM_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenBuffers(1, &pointVBO);
glBindBuffer(GL_ARRAY_BUFFER, pointVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDbufferSize, NULL, GL_STREAM_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ARRAY_BUFFER, colorVBO);
glVertexAttribPointer(colorAttribute, 3, GL_FLOAT, false, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, pointVBO);
glVertexAttribPointer(positionAttribute, 3, GL_FLOAT, false, 0, 0);
glClearColor(1,1,1,1);
glColor4f(1.0,1.0,1.0,1.0);
//glLineWidth(5);
glPointSize(10);
GLenum temp = glGetError();
if (temp != GL_NO_ERROR) {
fprintf(stderr, "Got GL error: %x line %i\n", temp, __LINE__);
}
return 1;
}
void DrawDelegate::SetLineSize(float size) {
glLineWidth(size);
}
void DrawDelegate::SetViewMatrix(float* viewmatrix) {
glUniformMatrix4fv(viewMatrixUniform, 1, false, viewmatrix);
}
void DrawDelegate::BeginFrame() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(shaderProgram);
glBindBuffer(GL_ARRAY_BUFFER, colorVBO);
glVertexAttribPointer(colorAttribute, 3, GL_FLOAT, false, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, pointVBO);
glVertexAttribPointer(positionAttribute, 3, GL_FLOAT, false, 0, 0);
glClearColor(1,1,1,1);
glColor4f(1.0,1.0,1.0,1.0);
}
void DrawDelegate::DrawTriangles(float* pos, int npos, float* color, int ncolor) {
while(npos > DDbufferSize) {
printf("buffer not big enough\n");
DDbufferSize *= 2;
}
while (ncolor > DDcolorbufferSize)
DDcolorbufferSize *= 2;
glBindBuffer(GL_ARRAY_BUFFER, colorVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDcolorbufferSize, NULL, GL_STREAM_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * ncolor, color);
glBindBuffer(GL_ARRAY_BUFFER, pointVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDbufferSize, NULL, GL_STREAM_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * npos, pos);
glDrawArrays(GL_TRIANGLES, 0, npos/3);
GLenum temp = glGetError();
if (temp != GL_NO_ERROR) {
fprintf(stderr, "Got GL error: %x line %i\n", temp, __LINE__);
}
}
void DrawDelegate::DrawLines(float* pos, int npos, float* color, int ncolor) {
while(npos > DDbufferSize) {
printf("buffer not big enough\n");
DDbufferSize *= 2;
}
while (ncolor > DDcolorbufferSize)
DDcolorbufferSize *= 2;
glBindBuffer(GL_ARRAY_BUFFER, colorVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDcolorbufferSize, NULL, GL_STREAM_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * ncolor, color);
glBindBuffer(GL_ARRAY_BUFFER, pointVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDbufferSize, NULL, GL_STREAM_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * npos, pos);
glDrawArrays(GL_LINES, 0, npos/3);
GLenum temp = glGetError();
if (temp != GL_NO_ERROR) {
fprintf(stderr, "Got GL error: %x line %i\n", temp, __LINE__);
}
}
void DrawDelegate::DrawPoints(float* pos, int npos, float* color, int ncolor) {
while(npos > DDbufferSize) {
printf("buffer not big enough\n");
DDbufferSize *= 2;
}
while (ncolor > DDcolorbufferSize)
DDcolorbufferSize *= 2;
glBindBuffer(GL_ARRAY_BUFFER, colorVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDcolorbufferSize, NULL, GL_STREAM_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * ncolor, color);
glBindBuffer(GL_ARRAY_BUFFER, pointVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*DDbufferSize, NULL, GL_STREAM_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * npos, pos);
glDrawArrays(GL_POINTS, 0, npos/3);
GLenum temp = glGetError();
if (temp != GL_NO_ERROR) {
//fprintf(stderr, "%s\n", gluErrorString(error));
fprintf(stderr, "Got GL error: %x line %i\n", temp, __LINE__);
}
}