I am using advanced OpenDL methods (VBO, VBA, ...) to render over screen. Currently I abstracted vbo, vba, index buffer, texture, and shader to a class called 'Object2D'.
I tried to render two objects on screen. I saw that when the same shader is applied to both objects it works fine; but if the two objects are rendered with two different shader script, only the one rendered last is visible to screen.
Here is Object2D::render():
void Render()
{
if(check_status())
{
sh.bind(); //shader
vb.Bind(); //vertex buffer
ib.Bind(); //index buffer
tex.bind(); //texture buffer
glDrawElements(GL_TRIANGLES,6,GL_UNSIGNED_INT,NULL);
}
else{}
//sh.unbind();
}
And here is the drawing function (assume the two 2D objects are obj and box):
void display()
{
glClear(GL_COLOR_BUFFER_BIT); //refresh/..
box.sh.setUniformMat4x4("m_projection",GL_FALSE,1,&m_PROJ[0][0]);
box.Render();
obj.sh.setUniformMat4x4("projection_matrix",GL_FALSE,1,&m_PROJ[0][0]);
obj.sh.setUniformMat4x4("view_matrix",GL_FALSE,1,&view_transform[0][0]);
obj.Render();
glFlush();
}
And this is the shader binded to box:
#shader vertex
#version 330 core
layout(location = 0) in vec4 positions;
uniform mat4 m_projection;
void main(void)
{
gl_Position=m_projection*positions;
}
#shader fragment
#version 330 core
layout(location=0) out vec4 color;
void main(void)
{
color=vec4(1.0,0.4,0.3,1.0);
}
and this shader is binded to obj:
#shader vertex
#version 330 core
layout(location = 0) in vec4 positions;
layout(location=0) in vec2 texture_coodrinate;
out vec4 p;
out vec2 TexCoord;
uniform mat4 projection_matrix;
uniform mat4 view_matrix;
void main(void)
{
gl_Position=projection_matrix*view_matrix*positions; //modelvi
p=projection_matrix*view_matrix*positions;;
TexCoord=texture_coodrinate;
}
#shader fragment
#version 330 core
layout(location=0) out vec4 color;
in vec4 p;
in vec2 TexCoord;
uniform vec4 U_color;
uniform sampler2D tex_;
void main(void)
{
;
U_color;
color=texture(tex_,TexCoord);
}
My problems are:
- Two of the objects aren't being rendered if until and unless both the shaders are same
- Unbinding the shader result in no rendering?
