CODEWITHSUNDEEP
c++openglglsl
Ivan Ermolaev
Ivan Ermolaev

Reputation: 1032

Error in OpenGL Redbook example, Chapter 3

I read the OpenGL Readbook 8th Editor. But I can't create example from Chapter 3 "Drawing Commands Example". Authors used in the example the own library vmath.h. But It don't work. They forgot add to library function "vmath::translation(GLfloat, GLfloat, GLfloat);", although used it. And authors used the own library "vapp.h", which confuses me. There a lot of macros, by means which defined class. I'm really confused. I used instead of their library, the "Eigen" library for linear algebra.

Here is my code on GitHub

I compiled and run this program. It work. But I see a black window, but I should to see a four triangles. What Did I do wrong? P.S. I redid Authors's program, by means of used for matrices and vertices the "Eigen Library". I saw only the black screen. Why?! Here is code on GitHub I have two shaders:
vertex shader:

#version 400 core

uniform mat4 model_matrix;
uniform mat4 projection_matrix;

layout (location = 0) in vec4 position;
layout (location = 1) in vec4 color;

out vec4 vs_fs_color;

void main(void)
{
    vs_fs_color = color;
    gl_Position = projection_matrix * (model_matrix * position);
}

And fragment shader:

#version 400 core

in vec4 vs_fs_color;

layout (location = 0) out vec4 color;

void main(void)
{
    color = vs_fs_color;
}


I exactly use a these shaders. Here is what I should see.
This is original project(MSVC++)
This is a include files(including vapp.h and vapp.h)

Upvotes: 0

Views: 578

Answers (1)

catscradle
catscradle

Reputation: 1719

When you're setting up your model_matrix, the second argument to glUniformMatrix4fv should be 1, not 4. Also, you are using wrong indices in frustum. Change result(2, 0) to result(0, 2) and do the same for all the other pairs.

Upvotes: 1

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