Multiple OpenGL Textures not working in some instances? - c++

I am trying to load OBJ files to use them in OpenGL. Every object in the OBJ file has its own texture. In my code I split up every object of the file into a struct that is defended like this:
struct ObjModelComponent {
std::vector<glm::vec3> vertices;
std::vector<glm::vec2> uvs;
std::vector<glm::vec3> normals;
Texture tex;
ArrayBuffer vertex, uv, normal;
GLuint VAO;
};
The Texture class is a simple class to make loading and handling a texture easier.
In the class of the model I have a std::vector of my ObjModelComponent.
I'm rendering the Object like this:
void ObjModel::render() {
for(int i = 0; i < components.size(); i++) {
components[i].vertex.activate();
components[i].uv.activate();
components[i].normal.activate();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, components[i].tex.getTextureID());
shader->sendInt(0, components[i].tex.getTextureName());
glBindVertexArray(components[i].VAO);
shader->sendMat4(*data->projection, "projection");
shader->sendMat4(data->viewMat, "view");
shader->sendMat4(model, "model");
glDrawArrays(GL_TRIANGLES, 0, int(components[i].vertices.size()));
glBindVertexArray(0);
}
}
The Texture class looks like this:
Texture::Texture(std::string fileName, TextureType type):
textureName("tex"), fileName(fileName), type(type) {
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
unsigned char *image = SOIL_load_image(fileName.c_str(), &texWidth, &texHeight, 0, SOIL_LOAD_RGBA);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
switch (type) {
case TEXTURE_GENERATE_MIPMAP:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glGenerateMipmap(GL_TEXTURE_2D);
break;
case TEXTURE_NO_MIP_MAP:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
default:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
break;
}
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
}
Texture::Texture() {
}
Texture& Texture::operator=(const Texture &other) {
this->fileName = other.fileName;
this->textureName = other.textureName;
this->type = other.type;
// glDeleteTextures(1, &tex);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
unsigned char *image = SOIL_load_image(fileName.c_str(), &texWidth, &texHeight, 0, SOIL_LOAD_RGBA);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
switch (type) {
case TEXTURE_GENERATE_MIPMAP:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glGenerateMipmap(GL_TEXTURE_2D);
break;
case TEXTURE_NO_MIP_MAP:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
default:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
break;
}
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return *this;
}
Texture::~Texture() {
glDeleteTextures(1, &tex);
}
GLuint Texture::getTextureID() {
return tex;
}
void Texture::setTextureName(std::string name) {
textureName = name;
}
std::string Texture::getTextureName() {
return textureName;
}
glm::vec2 Texture::getTextureSize() {
return glm::vec2(texWidth, texHeight);
}
This is how the components are generated:
for(int i = 0; i < fileLines.size(); i++) {
if(fileLines[i].substr(0, 2) == "o ") {
if(!first) {
tmpComp.tex = tmpTex;
components.emplace_back(tmpComp);
componentIndex++;
}
first = false;
tmpTex = Texture(hg::substr(path, 0, int(path.find_last_of("/"))) + "/" + hg::substr(fileLines[i], 2, int(fileLines[i].length())) + ".png");
}
}
This is how the VAOs and array buffers are generated:
for(int i = 0; i < components.size(); i++) {
glGenVertexArrays(1, &components[i].VAO);
glBindVertexArray(components[i].VAO);
components[i].vertex.setData(components[i].vertices.data(), sizeof(glm::vec3) * components[i].vertices.size(), 0);
components[i].uv.setData(components[i].uvs.data(), sizeof(glm::vec2) * components[i].uvs.size(), 1);
components[i].normal.setData(components[i].normals.data(), sizeof(glm::vec3) * components[i].normals.size(), 2);
components[i].vertex.activate();
components[i].uv.activate();
components[i].normal.activate();
glBindVertexArray(0);
}
You can find my complete code on GitHub: https://github.com/Kuechenzwiebel/SDL-OpenGL-Tests
The problem is, that the texture displayed on my object is that, that was used by the last object that was rendered.
Update: Removing the glDeleteTextures in the destructor of the Texture, yields in the result, that the texture displayed on all components is that that was used for the last component.
I really don't understand why this isn't working, I copied it from other primitives, that only use one texture. And there everything is working fine.

I found a workaround, instead of having separate ArrayBuffers and VAOs, I only use one of each and also store at which index a new object begins. There I change the texture that is used.

Related

How to properly use glTexImage2D to render an object each frame?

This is the code for a ground object that gets rendered every frame in a game I'm making with c++ and openGl.
Ground::Ground() {
this->loadedObject = loadObject("ground.obj");
this->vertices = getVerticesFromLoadedObject(this->loadedObject);
this->textureCoords = getTextureCoordsFromLoadedObject(this->loadedObject);
this->textureData = loadTexture("ground.jpg");
glGenTextures(1, &this->textureId);
glBindTexture(GL_TEXTURE_2D, this->textureId);
}
void Ground::draw() {
glEnable(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, this->textureData.width, this->textureData.height, 0, GL_RGB, GL_UNSIGNED_BYTE, this->textureData.data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY_EXT);
tinyobj::shape_t shape = this->loadedObject.shape;
unsigned int vertexCount = shape.mesh.num_face_vertices.size() * 3;
glTexCoordPointer(2, GL_FLOAT, 0, this->textureCoords);
glVertexPointer(3, GL_FLOAT, 0, this->vertices);
glDrawArrays(GL_TRIANGLES, 0, vertexCount);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY_EXT);
glDisable(GL_TEXTURE_2D);
}
Even though this works, calling glTexImage2D every frame causes a memory leak, but I can't get the texture to show otherwise, I tried doing the call in Ground's constructor but it doesn't load the image at all. How do I load the image just once to avoid the memory leak?
Update: with glTexImage2D in the constructor
Ground::Ground() {
this->loadedObject = loadObject("ground.obj");
this->vertices = getVerticesFromLoadedObject(this->loadedObject);
this->textureCoords = getTextureCoordsFromLoadedObject(this->loadedObject);
this->textureData = loadTexture("ground.jpg");
glGenTextures(1, &this->textureId);
glBindTexture(GL_TEXTURE_2D, this->textureId);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, this->textureData.width, this->textureData.height, 0, GL_RGB, GL_UNSIGNED_BYTE, this->textureData.data);
}
void Ground::draw() {
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, this->textureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY_EXT);
tinyobj::shape_t shape = this->loadedObject.shape;
unsigned int vertexCount = shape.mesh.num_face_vertices.size() * 3;
glTexCoordPointer(2, GL_FLOAT, 0, this->textureCoords);
glVertexPointer(3, GL_FLOAT, 0, this->vertices);
glDrawArrays(GL_TRIANGLES, 0, vertexCount);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY_EXT);
glDisable(GL_TEXTURE_2D);
}

OpenGL 4.1 and lower Black Texture, Mac and Windows

I had this problem when compiling my OpenGL code on lower-end PC's that don't support OpenGL 4.5 and macs. In my regular code, I would use functions like glCreateTextures and glTextureStorage2D, but they are not supported in other versions so I went the other glGenTextures path.
Here's the image generation code:
Texture::Texture(const std::string& path)
: m_Path(path)
{
int width, height, channels;
stbi_set_flip_vertically_on_load(1);
unsigned char* data = stbi_load(path.c_str(), &width, &height, &channels, 0);
RW_CORE_ASSERT(data, "Failed to load image!");
m_Width = width;
m_Height = height;
GLenum internalFormat = 0, dataFormat = 0;
if (channels == 4)
{
internalFormat = GL_RGBA8;
dataFormat = GL_RGBA;
}
else if (channels == 3)
{
internalFormat = GL_RGB8;
dataFormat = GL_RGB;
}
m_InternalFormat = internalFormat;
m_DataFormat = dataFormat;
RW_CORE_ASSERT(internalFormat & dataFormat, "Format not supported!");
glGenTextures(1, &m_ID);
glBindTexture(GL_TEXTURE_2D, m_ID);
glTexParameteri(m_ID, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(m_ID, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(m_ID, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(m_ID, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexImage2D(m_ID, 1, internalFormat, m_Width, m_Height, 0, dataFormat, GL_UNSIGNED_BYTE, data);
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(data);
}
And I want to bind my textures to specific slots on the GPU so I have this function:
void Texture::Bind(uint32_t slot) const
{
glActiveTexture(GL_TEXTURE0 + slot);
glBindTexture(GL_TEXTURE_2D, m_ID);
}
Here's the screenshot of what gets drawn:
To make sure it wasn't a rendering problem I decided to put it into ImGui's renderer.
And here's the picture I am supposed to get:
And image imports correctly, I get no errors and same importing code and paths work on higher-end PC and the only thing that's changed is that the higher-end PC has OpenGL 4.5 texture generation code.
It turns out I had to specify GL_TEXTURE_2D in these places instead of texture ID:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexImage2D(GL_TEXTURE_2D, 1, internalFormat, m_Width, m_Height, 0, dataFormat, GL_UNSIGNED_BYTE, data);

Creating objects as global / static object crashes, while a local object doesn't

I created a class for OpenGL textures and for some applications, a static object would be useful.
The problem is, when I create a texture as static or global object, my program crashes, while as local object, everything works fine. I have absolutely no idea what is going on.
This is my constructor:
Texture::Texture(std::string file, bool bitmap):
textureName("tex"), transparent(false) {
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
int texWidth, texHeight;
unsigned char *data = SOIL_load_image(file.c_str(), &texWidth, &texHeight, 0, SOIL_LOAD_RGBA);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
if(bitmap) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
glBindTexture(GL_TEXTURE_2D, 0);
for(int i = 3; i < texWidth * texHeight * 4; i+= 4) {
if(data[i] != 0xff) {
transparent = true;
break;
}
}
textureSize = glm::vec2(texWidth, texHeight);
SOIL_free_image_data(data);
}
OpenGL must be initialized before you can call any OpenGL functions. (More accurately: you need to have "made an OpenGL context current")
The way you do that depends on which libraries you are using.
One thing that all the libraries have in common is: there are some functions you need to call, which you usually call in main. (for example, glfwCreateWindow and glfwMakeContextCurrent in GLFW)
Since global objects are created before main is called, you are trying to call OpenGL functions before you have an OpenGL context. This doesn't work.

Using FBO to render YUV data

I was able to render YUV image on the screen using shaders.
To improve performance I want to use FBO. But I am not able to do it.
My initialization code is as below
void opengl_init(int w, int h) {
glGenFramebuffers(1, &framebuffer);
checkGlError("glGenFramebuffers");
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
checkGlError("glBindFramebuffer");
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &gYTexture);
glBindTexture(GL_TEXTURE_2D, gYTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, FRAME_WIDTH, FRAME_HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
glGenRenderbuffers(1, &colorbuffer);
checkGlError("glGenRenderbuffers");
glBindRenderbuffer(GL_RENDERBUFFER, colorbuffer);
checkGlError("glBindRenderbuffer");
glRenderbufferStorage(GL_RENDERBUFFER,
GL_RGB565, FRAME_WIDTH, FRAME_HEIGHT);
checkGlError("glRenderbufferStorage");
glFramebufferRenderbuffer(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, depthbuffer);
checkGlError("glFramebufferRenderbuffer");
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
gYTexture, 0);
checkGlError("glFramebufferTexture2D");
int status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
printf("Framebuffer is not complete: *status* = %d", status);
if (status != GL_FRAMEBUFFER_COMPLETE) {
printf("Framebuffer is not complete: *status* = %d", status);
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
checkGlError("glBindFramebuffer");
glGenBuffers(1, ioBuf);
checkGlError("glGenBuffers");
glActiveTexture(GL_TEXTURE1);
glGenTextures(1, &gUTexture);
glBindTexture(GL_TEXTURE_2D, gUTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glActiveTexture(GL_TEXTURE2);
glGenTextures(1, &gVTexture);
glBindTexture(GL_TEXTURE_2D, gVTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glViewport(0, 0, w, h);
checkGlError("glViewport");
}
I render my frame using the below code
void opengl_renderframe(void *yuvbuf,int framewidth, int frameheight) {
static void *ubuf, *vbuf;
ubuf = (char *)yuvbuf + (framewidth * frameheight);
vbuf = (char *)ubuf + ((framewidth * frameheight) / 4);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
checkGlError("glBindFramebuffer");
glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
checkGlError("glClearColor");
glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
checkGlError("glClear");
glUseProgram(gProgram);
checkGlError("glUseProgram");
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gYTexture);
glBindBuffer(GL_ARRAY_BUFFER, ioBuf);
checkGlError("glBindBuffer");
glBufferData(GL_ARRAY_BUFFER, (FRAME_WIDTH * FRAME_HEIGHT) , yuvbuf, GL_STATIC_DRAW);
checkGlError("glBufferData");
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, FRAME_WIDTH, FRAME_HEIGHT, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, NULL);
checkGlError("glTexImage2D");
glBindBuffer(GL_ARRAY_BUFFER, 0);
checkGlError("glBindBuffer");
glUniform1i(Ysamp, 0);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gUTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, framewidth/2, frameheight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, ubuf );
glUniform1i(Usamp, 1);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gVTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, framewidth/2, frameheight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, vbuf );
glUniform1i(Vsamp, 2);
glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
checkGlError("glVertexAttribPointer");
glEnableVertexAttribArray(gvPositionHandle);
checkGlError("glEnableVertexAttribArray");
glVertexAttribPointer(gaTextureCoordHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices2);
checkGlError("glVertexAttribPointer");
glEnableVertexAttribArray(gaTextureCoordHandle);
checkGlError("glEnableVertexAttribArray");
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
checkGlError("glDrawArrays");
glBindFramebuffer(GL_FRAMEBUFFER, 0);
checkGlError("glBindFramebuffer 0");
}
my fragment shader to render only Y data is as below
static const char gGrayScaleFragmentShader[] =
"precision mediump float;\n"
"varying vec2 vTextureCoord;\n"
"uniform sampler2D sTexture;\n"
"void main() {\n"
" gl_FragColor = texture2D(sTexture, vTextureCoord);\n"
"}\n";

OpenGL: Render to FBO using multiple textures

I'm experimenting with a renderer. What I want is to write a color buffer and a normal buffer to two separate textures. I got that part figured out.
However, the color buffer is supposed to be a combination of two textures. This should do the trick:
glActiveTexture(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
g_Tex->Bind();
glActiveTexture(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
g_TexNormal->Bind();
g_Shader->Enable();
RenderScene();
g_Shader->Disable();
glActiveTexture(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_2D);
glActiveTexture(GL_TEXTURE0_ARB);
glDisable(GL_TEXTURE_2D);
And this is the fragment shader: (GLSL)
uniform sampler2D tex_diffuse;
uniform sampler2D tex_normal;
void main()
{
gl_FragColor = texture2D(tex_diffuse, gl_TexCoord[0].st);
//gl_FragColor = texture2D(tex_normal, gl_TexCoord[0].st);
}
However, the second texture is the same as the first! Whichever texture is attached to GL_TEXTURE0 is the one used for both samplers.
Initializing the FBO:
glGenFramebuffersEXT(1, &g_FBOColor);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, g_FBOColor);
glGenTextures(1, &g_FBOTexColor);
glBindTexture(GL_TEXTURE_2D, g_FBOTexColor);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, g_FBOTexColor, 0);
glGenTextures(1, &g_FBOTexNormal);
glBindTexture(GL_TEXTURE_2D, g_FBOTexNormal);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_2D, g_FBOTexNormal, 0);
glGenTextures(1, &g_FBOTexDepth);
glBindTexture(GL_TEXTURE_2D, g_FBOTexDepth);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, w, h, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, g_FBOTexDepth, 0);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
Complete render section:
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, g_FBOColor);
glPushAttrib(GL_VIEWPORT_BIT | GL_COLOR_BUFFER_BIT);
glViewport(
0, 0,
Window::GetSingleton()->GetWidth(), Window::GetSingleton()->GetHeight()
);
GLenum buffers[] = { GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT };
glDrawBuffers(2, buffers);
//glReadBuffer(GL_COLOR_ATTACHMENT0_EXT | GL_COLOR_ATTACHMENT1_EXT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
g_Tex->Bind();
glActiveTexture(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
g_TexNormal->Bind();
g_Shader->Enable();
RenderScene();
g_Shader->Disable();
glActiveTexture(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_2D);
glActiveTexture(GL_TEXTURE0_ARB);
glDisable(GL_TEXTURE_2D);
glPopAttrib();
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
Thanks in advance.
Well I figured it out. :)
The reason my textures didn't work was because I didn't set up the uniform locations. Fixed code:
g_Shader->Enable();
glActiveTexture(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
g_Tex->Bind();
glUniform1i(glGetUniformLocation(g_Shader->GetProgram(), "tex_diffuse"), 0);
glActiveTexture(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
g_TexNormal->Bind();
glUniform1i(glGetUniformLocation(g_Shader->GetProgram(), "tex_normal"), 1);
RenderScene();
glActiveTexture(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_2D);
glActiveTexture(GL_TEXTURE0_ARB);
glDisable(GL_TEXTURE_2D);
g_Shader->Disable();