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MinorMapillai
07-20-2018, 08:06 AM
I recently started learning tessellation and today I was trying to draw a triangle after tessellation so that I can see all the tessellated smaller triangles using gl_PolygonMode(GL_FRONT_AND_BACK, GL_LINE). But for some reason the output is just a coloured background without any triangle in it.
For the tessellation, I make a control shader and an evaluation shader and then attach them to my program.
Is it defaulting to GL_FILL mode for some reason?
I am not able to figure out what's wrong since I am just following along my book (OpenGL Superbible 7th Edition).
How can I fix this?

ProgrammerX
07-23-2018, 01:37 AM
I recently started learning tessellation and today I was trying to draw a triangle after tessellation so that I can see all the tessellated smaller triangles using gl_PolygonMode(GL_FRONT_AND_BACK, GL_LINE). But for some reason the output is just a coloured background without any triangle in it.
For the tessellation, I make a control shader and an evaluation shader and then attach them to my program.
Is it defaulting to GL_FILL mode for some reason?
I am not able to figure out what's wrong since I am just following along my book (OpenGL Superbible 7th Edition).
How can I fix this?

It is hard to guess what might be wrong without any code snippets.

MinorMapillai
07-23-2018, 06:02 AM
It is hard to guess what might be wrong without any code snippets.
The code for the entire program is:


GLuint compile_shaders(void)
{
GLuint vertex_shader;
GLuint fragment_shader;
GLuint control_shader;
GLuint evaluation_shader;
GLuint program;

// Source code for Vertex Shader
static const GLchar * vertex_shader_source[] =
{
"#version 450 core \n"
" \n"
"// offset and color are input vertex attribute \n"
"layout (location = 0) in vec4 offset; \n"
"layout (location = 1) in vec4 color; \n"
" \n"
"//Declare VS_OUT as an output interface block \n"
"out VS_OUT \n"
"{ \n"
" vec4 color; //Send color to next stage \n"
"}vs_out; \n"
" \n"
"void main(void) \n"
"{ \n"
" //Decalre a hardcoded array of positions \n"
" const vec4 vertices[3] = vec4[3](vec4(0.25, -0.25, 0.5, 1.0), \n"
" vec4(-0.25, -0.25, 0.5, 1.0), \n"
" vec4(0.25, 0.25, 0.5, 1.0)); \n"
" \n"
" //Index into our array using gl_VertexID \n"
" gl_Position = vertices[gl_VertexID] + offset; \n"
" \n"
"//color = vec4(1.0, 0.0, 0.0, 1.0); \n"
"//Output fixed value for vs_color \n"
"vs_out.color = color; \n"
"} \n"
};

// Source code for Fragment Shader
static const GLchar * fragment_shader_source[] =
{
"#version 450 core \n"
" \n"
"//Declare VS_OUT as an input interface block \n"
"in VS_OUT \n"
"{ \n"
" vec4 color; //Send color to next stage \n"
"}fs_in; \n"
" \n"
"//Ouput to the framebuffer \n"
"out vec4 color; \n"
" \n"
"void main(void) \n"
"{ \n"
"// Simply assign the color we were given by the vertex shader to our output \n"
" color = fs_in.color; \n"
"} \n"
};

// Source code for Tesselation Control Shader
static const GLchar * tesselation_control_shader[] =
{
"#version 450 core \n"
" \n"
"layout(vertices = 3) out; \n"
" \n"
"void main(void) \n"
"{ \n"
" //Only if I am invocation 0 \n"
" if (gl_InvocationID == 0) \n"
" { \n"
" gl_TessLevelInner[0] = 5.0; \n"
" gl_TessLevelOuter[0] = 5.0; \n"
" gl_TessLevelOuter[1] = 5.0; \n"
" gl_TessLevelOuter[2] = 5.0; \n"
" } \n"
" \n"
" // Everybody copies their input to their input \n"
" gl_out[gl_InvocationID].gl_Position = \n"
" gl_in[gl_InvocationID].gl_Position; \n"
"} \n"
};

// Source code for tesselation evaluation shader
static const GLchar * tesselation_evaluation_shader[] =
{
"#version 450 core \n"
" \n"
"layout(triangles, equal_spacing, cw) in; \n"
" \n"
"void main(void) \n"
"{ \n"
" gl_Position = (gl_TessCoord.x * gl_in[0].gl_Position + \n"
" gl_TessCoord.y * gl_in[1].gl_Position + \n"
" gl_TessCoord.z * gl_in[2].gl_Position); \n"
"} \n"
};

// Create and compiler Vertex Shader
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, vertex_shader_source, NULL);
glCompileShader(vertex_shader);

// Create and compiler Fragment Shader
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, fragment_shader_source, NULL);
glCompileShader(fragment_shader);


// Create and compile tesselation control shader
control_shader = glCreateShader(GL_TESS_CONTROL_SHADER);
glShaderSource(control_shader, 1, tesselation_control_shader, NULL);
glCompileShader(control_shader);

// Create and compile tesselation evaluation shader
evaluation_shader = glCreateShader(GL_TESS_CONTROL_SHADER);
glShaderSource(evaluation_shader, 1, tesselation_control_shader, NULL);
glCompileShader(evaluation_shader);

// Create program, attach shaders to it, and link it
program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
glAttachShader(program, control_shader);
glAttachShader(program, evaluation_shader);
glLinkProgram(program);

// Delete shaders as program has them now
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
glDeleteShader(control_shader);
glDeleteShader(evaluation_shader);

return program;
};

class TesselationCSOne : public sb7::application
{
public:

void startup()
{
rendering_program = compile_shaders();
glCreateVertexArrays(1, &vertex_array_object);
glBindVertexArray(vertex_array_object);
}

void shutdown()
{
glDeleteVertexArrays(1, &vertex_array_object);
glDeleteProgram(rendering_program);
glDeleteVertexArrays(1, &vertex_array_object);
}

// Our rendering function
void render(double currentTime)
{
// Sets colour
static const GLfloat color[] = { (float)sin(currentTime) * 0.5f + 0.5f, (float)sin(currentTime) * 0.5f + 0.5f, 0.0f, 1.0f };

glClearBufferfv(GL_COLOR, 0, color);

//Tell OpenGL to draw only the outlines of the resulting triangle
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

// Use program object we created for rendering
glUseProgram(rendering_program);

GLfloat attrib[] = { 1.0, 0.0, 0.0, 0.0 };/*{ (float)sin(currentTime) * 0.5f, (float)sin(currentTime) * 0.6f, 0.0f, 0.0f };*/

// Update value of input attribute 0
glVertexAttrib4fv(0, attrib);

// Draw pathes for tesselation shaders
glPatchParameteri(GL_PATCH_VERTICES, 3);
// Draw one triangle
glDrawArrays(GL_PATCHES, 0, 3);
}

private:

GLuint rendering_program;
GLuint vertex_array_object;
};

// Only instance of DECLARE_MAIN to state entry point
DECLARE_MAIN(TesselationCSOne);


Does that help?

ProgrammerX
07-25-2018, 11:06 PM
The code for the entire program is:


GLuint compile_shaders(void)
{
GLuint vertex_shader;
GLuint fragment_shader;
GLuint control_shader;
GLuint evaluation_shader;
GLuint program;

// Source code for Vertex Shader
static const GLchar * vertex_shader_source[] =
{
"#version 450 core \n"
" \n"
"// offset and color are input vertex attribute \n"
"layout (location = 0) in vec4 offset; \n"
"layout (location = 1) in vec4 color; \n"
" \n"
"//Declare VS_OUT as an output interface block \n"
"out VS_OUT \n"
"{ \n"
" vec4 color; //Send color to next stage \n"
"}vs_out; \n"
" \n"
"void main(void) \n"
"{ \n"
" //Decalre a hardcoded array of positions \n"
" const vec4 vertices[3] = vec4[3](vec4(0.25, -0.25, 0.5, 1.0), \n"
" vec4(-0.25, -0.25, 0.5, 1.0), \n"
" vec4(0.25, 0.25, 0.5, 1.0)); \n"
" \n"
" //Index into our array using gl_VertexID \n"
" gl_Position = vertices[gl_VertexID] + offset; \n"
" \n"
"//color = vec4(1.0, 0.0, 0.0, 1.0); \n"
"//Output fixed value for vs_color \n"
"vs_out.color = color; \n"
"} \n"
};

// Source code for Fragment Shader
static const GLchar * fragment_shader_source[] =
{
"#version 450 core \n"
" \n"
"//Declare VS_OUT as an input interface block \n"
"in VS_OUT \n"
"{ \n"
" vec4 color; //Send color to next stage \n"
"}fs_in; \n"
" \n"
"//Ouput to the framebuffer \n"
"out vec4 color; \n"
" \n"
"void main(void) \n"
"{ \n"
"// Simply assign the color we were given by the vertex shader to our output \n"
" color = fs_in.color; \n"
"} \n"
};

// Source code for Tesselation Control Shader
static const GLchar * tesselation_control_shader[] =
{
"#version 450 core \n"
" \n"
"layout(vertices = 3) out; \n"
" \n"
"void main(void) \n"
"{ \n"
" //Only if I am invocation 0 \n"
" if (gl_InvocationID == 0) \n"
" { \n"
" gl_TessLevelInner[0] = 5.0; \n"
" gl_TessLevelOuter[0] = 5.0; \n"
" gl_TessLevelOuter[1] = 5.0; \n"
" gl_TessLevelOuter[2] = 5.0; \n"
" } \n"
" \n"
" // Everybody copies their input to their input \n"
" gl_out[gl_InvocationID].gl_Position = \n"
" gl_in[gl_InvocationID].gl_Position; \n"
"} \n"
};

// Source code for tesselation evaluation shader
static const GLchar * tesselation_evaluation_shader[] =
{
"#version 450 core \n"
" \n"
"layout(triangles, equal_spacing, cw) in; \n"
" \n"
"void main(void) \n"
"{ \n"
" gl_Position = (gl_TessCoord.x * gl_in[0].gl_Position + \n"
" gl_TessCoord.y * gl_in[1].gl_Position + \n"
" gl_TessCoord.z * gl_in[2].gl_Position); \n"
"} \n"
};

// Create and compiler Vertex Shader
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, vertex_shader_source, NULL);
glCompileShader(vertex_shader);

// Create and compiler Fragment Shader
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, fragment_shader_source, NULL);
glCompileShader(fragment_shader);


// Create and compile tesselation control shader
control_shader = glCreateShader(GL_TESS_CONTROL_SHADER);
glShaderSource(control_shader, 1, tesselation_control_shader, NULL);
glCompileShader(control_shader);

// Create and compile tesselation evaluation shader
evaluation_shader = glCreateShader(GL_TESS_CONTROL_SHADER);
glShaderSource(evaluation_shader, 1, tesselation_control_shader, NULL);
glCompileShader(evaluation_shader);

// Create program, attach shaders to it, and link it
program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
glAttachShader(program, control_shader);
glAttachShader(program, evaluation_shader);
glLinkProgram(program);

// Delete shaders as program has them now
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
glDeleteShader(control_shader);
glDeleteShader(evaluation_shader);

return program;
};

class TesselationCSOne : public sb7::application
{
public:

void startup()
{
rendering_program = compile_shaders();
glCreateVertexArrays(1, &vertex_array_object);
glBindVertexArray(vertex_array_object);
}

void shutdown()
{
glDeleteVertexArrays(1, &vertex_array_object);
glDeleteProgram(rendering_program);
glDeleteVertexArrays(1, &vertex_array_object);
}

// Our rendering function
void render(double currentTime)
{
// Sets colour
static const GLfloat color[] = { (float)sin(currentTime) * 0.5f + 0.5f, (float)sin(currentTime) * 0.5f + 0.5f, 0.0f, 1.0f };

glClearBufferfv(GL_COLOR, 0, color);

//Tell OpenGL to draw only the outlines of the resulting triangle
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

// Use program object we created for rendering
glUseProgram(rendering_program);

GLfloat attrib[] = { 1.0, 0.0, 0.0, 0.0 };/*{ (float)sin(currentTime) * 0.5f, (float)sin(currentTime) * 0.6f, 0.0f, 0.0f };*/

// Update value of input attribute 0
glVertexAttrib4fv(0, attrib);

// Draw pathes for tesselation shaders
glPatchParameteri(GL_PATCH_VERTICES, 3);
// Draw one triangle
glDrawArrays(GL_PATCHES, 0, 3);
}

private:

GLuint rendering_program;
GLuint vertex_array_object;
};

// Only instance of DECLARE_MAIN to state entry point
DECLARE_MAIN(TesselationCSOne);


Does that help?

Yep, but I didn't find anything by just looking at the code. Don't have the time to copy and compile it at the moment. Maybe somebody else finds something.