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POOpenGL3 the wrong texture is displaying
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copied!<p>I am trying to add a second sampler2DRect texture to my program. I'm using separate shader files for the second texture, otherwise I'm using the same code that worked for displaying the first one. However, when I try to display the second texture, it's showing the first one instead, and I can't seem to figure out why. I've probably done one of the API calls wrong, or maybe omitted something important, but nothing I try fixes the problem.</p> <p>No GL errors are being reported, and gDEBugger doesn't show anything suspicious.</p> <p>I guess the issue could be somewhere else in my code, but here's the section that I'm using to try to draw the second texture (which is almost identical to the code which works to draw the first texture):</p> <pre><code>Test_World_Pause_Menu::Test_World_Pause_Menu(int resolution_width, int resolution_height) : _shaders("shaders/pause_menu.vert", "shaders/pause_menu.frag"), _vao_id( new GLuint[1] ), _mvp_id( new GLint[1] ), _pm_tex_id( new GLuint[1] ), _mvp( glm::ortho(0.0f, (GLfloat)resolution_width, 0.0f, (GLfloat)resolution_height, -1.0f, 1.0f) ), _pm_vertices_buffer( new GLuint[1] ), _pm_vertices( new GLfloat[12] ), _pm_colors_buffer( new GLuint[1] ), _pm_colors( new GLfloat[16] ), _pm_tex_coords_buffer( new GLuint[1] ), _pm_tex_coords( new GLfloat[8] ), _pm_normals_buffer( new GLuint[1] ), _pm_normals( new GLfloat[12] ) { glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // set alpha blending mode // begin pause menu initialization _pm_image.loadFromFile("resources/levels/test_00/pause_menu/pause_menu.png"); _pm_image.flipVertically(); unsigned int pm_location_x = 0; unsigned int pm_location_y = _pm_image.getSize().y; unsigned int pm_width = _pm_image.getSize().x; unsigned int pm_height = _pm_image.getSize().y; _pm_vertices[0] = pm_location_x; _pm_vertices[1] = pm_location_y; _pm_vertices[2] = 0.0f; _pm_vertices[3] = pm_location_x; _pm_vertices[4] = pm_location_y - pm_height; _pm_vertices[5] = 0.0f; _pm_vertices[6] = pm_location_x + pm_width; _pm_vertices[7] = pm_location_y - pm_height; _pm_vertices[8] = 0.0f; _pm_vertices[9] = pm_location_x + pm_width; _pm_vertices[10] = pm_location_y; _pm_vertices[11] = 0.0f; _pm_colors[0] = 1.0f; _pm_colors[1] = 1.0f; _pm_colors[2] = 1.0f; _pm_colors[3] = 0.0f; _pm_colors[4] = 1.0f; _pm_colors[5] = 1.0f; _pm_colors[6] = 1.0f; _pm_colors[7] = 0.0f; _pm_colors[8] = 1.0f; _pm_colors[9] = 1.0f; _pm_colors[10] = 1.0f; _pm_colors[11] = 0.0f; _pm_colors[12] = 1.0f; _pm_colors[13] = 1.0f; _pm_colors[14] = 1.0f; _pm_colors[15] = 0.0f; _pm_tex_coords[0] = 0.0f; _pm_tex_coords[1] = pm_height; _pm_tex_coords[2] = 0.0f; _pm_tex_coords[3] = 0.0f; _pm_tex_coords[4] = pm_width; _pm_tex_coords[5] = 0.0f; _pm_tex_coords[6] = pm_width; _pm_tex_coords[7] = pm_height; _pm_normals[0] = 0.0f; _pm_normals[1] = 0.0f; _pm_normals[2] = 0.0f; _pm_normals[3] = 0.0f; _pm_normals[4] = 0.0f; _pm_normals[5] = 0.0f; _pm_normals[6] = 0.0f; _pm_normals[7] = 0.0f; _pm_normals[8] = 0.0f; _pm_normals[9] = 0.0f; _pm_normals[10] = 0.0f; _pm_normals[11] = 0.0f; glGenVertexArrays(1, &_vao_id[0]); // generate VAO glBindVertexArray(_vao_id[0]); // bind VAO // vertices glEnableVertexAttribArray((GLuint)0); glGenBuffers(1, &_pm_vertices_buffer[0]); glBindBuffer(GL_ARRAY_BUFFER, _pm_vertices_buffer[0]); glBufferData(GL_ARRAY_BUFFER, 12 * sizeof(GLfloat), _pm_vertices.get(), GL_STATIC_DRAW); glVertexAttribPointer((GLuint)0, 3, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ARRAY_BUFFER, 0); glEnableVertexAttribArray(0); // normals (inexplicably needed even though it won't be used in the shaders) glEnableVertexAttribArray((GLuint)1); glGenBuffers(1, &_pm_normals_buffer[0]); glBindBuffer(GL_ARRAY_BUFFER, _pm_normals_buffer[0]); glBufferData(GL_ARRAY_BUFFER, 12 * sizeof(GLfloat), _pm_normals.get(), GL_STATIC_DRAW); glVertexAttribPointer((GLuint)1, 3, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ARRAY_BUFFER, 0); glEnableVertexAttribArray(0); // texture glEnableVertexAttribArray((GLuint)2); glGenBuffers(1, &_pm_tex_coords_buffer[0]); glBindBuffer(GL_ARRAY_BUFFER, _pm_tex_coords_buffer[0]); glBufferData(GL_ARRAY_BUFFER, 8 * sizeof(GLfloat), _pm_tex_coords.get(), GL_STATIC_DRAW); glVertexAttribPointer((GLuint)2, 2, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ARRAY_BUFFER, 0); glGenTextures(1, &_pm_tex_id[0]); glBindTexture(GL_TEXTURE_RECTANGLE, _pm_tex_id[0]); glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA, pm_width, pm_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, _pm_image.getPixelsPtr()); glEnableVertexAttribArray(0); // colors glEnableVertexAttribArray((GLuint)3); glGenBuffers(1, &_pm_colors_buffer[0]); glBindBuffer(GL_ARRAY_BUFFER, _pm_colors_buffer[0]); glBufferData(GL_ARRAY_BUFFER, 16 * sizeof(GLfloat), _pm_colors.get(), GL_STATIC_DRAW); glVertexAttribPointer((GLuint)3, 4, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ARRAY_BUFFER, 0); glEnableVertexAttribArray(0); // unbind buffers glBindVertexArray(0); _mvp_id[0] = glGetUniformLocation(_shaders.id(), "mvpMatrix"); _pm_tex_id[0] = glGetUniformLocation(_shaders.id(), "pauseMenuTex"); // end pause menu initialization } void Test_World_Pause_Menu::display() { glEnable(GL_BLEND); glDisable(GL_DEPTH_TEST); _shaders.bind(); glUniformMatrix4fv(_mvp_id[0], 1, GL_FALSE, &_mvp[0][0]); // begin pause menu rendering glUniform1i(_pm_tex_id[0], 0); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, _pm_tex_id[0]); glBindVertexArray(_vao_id[0]); // bind the VAO // draw the contents of the bound VAO glDrawArrays(GL_TRIANGLE_FAN, 0, 4); glBindVertexArray(0); // unbind the VAO // end pause menu rendering _shaders.unbind(); glDisable(GL_BLEND); glEnable(GL_DEPTH_TEST); return; } </code></pre> <p>Here are the shaders I'm using for this:</p> <p>Vertex Shader</p> <pre><code>#version 150 in vec4 in_Position; in vec3 in_Normal; in vec2 in_UV; in vec4 in_Color; uniform mat4 mvpMatrix; smooth out vec3 vVaryingNormal; smooth out vec2 vVaryingTexCoord; smooth out vec4 vVaryingColor; void main(void) { vVaryingNormal = in_Normal; vVaryingTexCoord = in_UV; vVaryingColor = in_Color; gl_Position = mvpMatrix * in_Position; } </code></pre> <p>Fragment Shader</p> <pre><code>#version 150 smooth in vec3 vVaryingNormal; smooth in vec2 vVaryingTexCoord; smooth in vec4 vVaryingColor; uniform sampler2DRect pauseMenuTex; out vec4 out_Color; void main(void) { out_Color.a = vVaryingColor.a; out_Color += texture(pauseMenuTex, vVaryingTexCoord); } </code></pre> <p>My guess is I'm not properly shutting off some texture state in here somewhere, but like I said, nothing I try fixes the problem. I can post code for other parts of the program if necessary.</p> <p><strong>Edit:</strong> There's definitely some wrong use of the API in this C++ code, as well as the code for the first texture, because when I remove the initialization and rendering functions for the first texture, the second one displays just fine. Can someone help me pinpoint my incorrect OpenGL usage (it's probably in the constructor).</p> <p><strong>Another Edit:</strong> Upon further investigation, I've found that whichever of the two objects' constructors is run first is the one whose texture displays during both display routines.</p> <p><strong>3rd Edit:</strong> Something that may be relevant: Unbinding the first texture with glBindTexture(GL_TEXTURE_RECTANGLE, 0) after calling glTexImage2D() in the constructor, causes it to not display at all during either of the two display routines. To me this seems like a problem, and it might be related to my other problem.</p>

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