opengl-3

问题 When do I use the STD140 for uniform blocks in OpenGL? Although I am not a 100% sure, I believe there is an alternative to it which can achieve the same thing, called "Shared". Is it just preference for the coder? Or are there reasons to use one over the other? 回答1: Uniform buffer objects are described in http://www.opengl.org/registry/specs/ARB/uniform_buffer_object.txt The data storage for a uniform block can be declared to use one of three layouts in memory: packed , shared , or std140 .

问题 When do I use the STD140 for uniform blocks in OpenGL? Although I am not a 100% sure, I believe there is an alternative to it which can achieve the same thing, called "Shared". Is it just preference for the coder? Or are there reasons to use one over the other? 回答1: Uniform buffer objects are described in http://www.opengl.org/registry/specs/ARB/uniform_buffer_object.txt The data storage for a uniform block can be declared to use one of three layouts in memory: packed , shared , or std140 .

问题 I am using glBindFragDataLocationIndexed() and writing two colors in fragment shader. Following is my code : glBindFragDataLocationIndexed(shader_data.psId, 0, 0, "Frag_Out_Color0"); glBindFragDataLocationIndexed(shader_data.psId, 0, 1, "Frag_Out_Color1"); glActiveTexture ( GL_TEXTURE0 ); LoadTexture(texture1); glBindTexture ( GL_TEXTURE_2D, tex_id1); glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA,width, height, 0, GL_RGBA,GL_UNSIGNED_BYTE, texture1_data); glActiveTexture ( GL_TEXTURE1 );

问题 I am using glBindFragDataLocationIndexed() and writing two colors in fragment shader. Following is my code : glBindFragDataLocationIndexed(shader_data.psId, 0, 0, "Frag_Out_Color0"); glBindFragDataLocationIndexed(shader_data.psId, 0, 1, "Frag_Out_Color1"); glActiveTexture ( GL_TEXTURE0 ); LoadTexture(texture1); glBindTexture ( GL_TEXTURE_2D, tex_id1); glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA,width, height, 0, GL_RGBA,GL_UNSIGNED_BYTE, texture1_data); glActiveTexture ( GL_TEXTURE1 );

问题 Following some OpenGL tutorials for OpenGL 3+, Right out of the gate, I've run into some discrepancies, here is the code I managed to get, but right out of the gate, I'm getting this massive slew of errors, none of which say it can't find the included headers, but merely that the headers don't define the core functions. #include <stdio.h> #include <stdlib.h> #include <GL/glew.h> #include <GL/glfw3.h> #include <glm/glm.hpp> int main(){ // Initialise GLFW if( !glfwInit() ) { fprintf( stderr,

来源： https://stackoverflow.com/questions/60265317/16bit-texture-with-odd-sized-width-is-sheering

来源： https://stackoverflow.com/questions/60265317/16bit-texture-with-odd-sized-width-is-sheering

问题 I am getting a weird OpenGL error when running my application on my HD4000 (Windows 64bit, driver version 15.28.20.64.3347). I boiled it down to a few OpenGL calls to reproduce it: Create two framebuffer objects. Create a texture and bind it as GL_COLOR_ATTACHMENT0 to both FBOs. Call glTexImage2D a second time on the texture Bind the first FBO and call glCheckFramebufferStatus (returns GL_FRAMEBUFFER_COMPLETE). Bind the second FBO and call glClear. The glClear gives an GL_INVALID_FRAMEBUFFER

问题 I know in 2.0- openGL we can draw a line simply like this. glBegin(GL_LINES); glVertex3f(20.0f,150.0f,0.0f); glVertex3f(220.0f,150.0f,0.0f); glVertex3f(200.0f,160.0f,0.0f); glVertex3f(200.0f,160.0f,0.0f); glEnd(); but how to do similar thing in modern openGL(3.0+) I have read Drawing round points using modern OpenGL but the answer is not about certain point,since I want to draw polygon with points have certain coordinates,it's not quite helpful. I use this code,but it shows nothing except a

问题 I know in 2.0- openGL we can draw a line simply like this. glBegin(GL_LINES); glVertex3f(20.0f,150.0f,0.0f); glVertex3f(220.0f,150.0f,0.0f); glVertex3f(200.0f,160.0f,0.0f); glVertex3f(200.0f,160.0f,0.0f); glEnd(); but how to do similar thing in modern openGL(3.0+) I have read Drawing round points using modern OpenGL but the answer is not about certain point,since I want to draw polygon with points have certain coordinates,it's not quite helpful. I use this code,but it shows nothing except a