fragment-shader

问题 I'm trying to draw a triangle using an OpenGL fragment shader. I succeeded in drawing a circle but I have a problem with handling the equation/logic or the code to draw a triangle. draw_triangle(vec2 v1 , vec2 v2, vec2 v3) Here is the fragment shader: #version 330 core out vec4 frag_color; void draw_circle(vec2 shift_val, int radius,int color) { vec2 res = vec2(1280,720); vec2 norm_cord = gl_FragCoord.xy; float dist = length(norm_cord - (res*shift_val)); if( dist < radius ) { if( color ==1 )

问题 I went through different sources and seen that we could draw a dotted line using a fragment shader. Because I am new to OpenGL I couldn't able to understand. Can anyone share some code sample that plot dotted or dashed line using fragment shader and GL_LINE_STRIP in Android. References: Dashed line in OpenGL3? Dotted back edges of object 回答1: Line stipple is not supported in OpenGL ES. If you use OpenGL ES 1.00, then you can use the approach which is presented in the answers to OpenGL ES -

来源： https://stackoverflow.com/questions/21524535/opengl-sampler-array-limit

来源： https://stackoverflow.com/questions/63892847/how-do-i-adjust-the-my-glsl-code-to-add-additional-light-sources

来源： https://stackoverflow.com/questions/63892847/how-do-i-adjust-the-my-glsl-code-to-add-additional-light-sources

问题 I'm creating a terrain mesh, and following this SO answer I'm trying to migrate my CPU computed normals to a shader based version, in order to improve performances by reducing my mesh resolution and using a normal map computed in the fragment shader. I'm using MapBox height map for the terrain data. Tiles look like this: And elevation at each pixel is given by the following formula: const elevation = -10000.0 + ((red * 256.0 * 256.0 + green * 256.0 + blue) * 0.1); My original code first

问题 As stated in the Metal Shading Language Guide: Writes to a buffer or a texture are disallowed from a fragment function. I understand that this is the case, but I'm curious as to why. Being able to write to a buffer from within a fragment shader is incredibly useful ; I understand that it is likely more complex on the hardware end to not know ahead of time the end location of memory writes for a particular thread, which you don't always know with raw buffer writes, but this is a capability

问题 I am trying to make a ray intersection with a triangle in the fragment shader, if it colide i will paint a black dot in the texture, if not colide i will paint the texture color. But it do not have effect, I do not know nothing more to do to resolve it. It is the Shader of the ground and have the coords of a geometry coming from vertex, this geometry will be draw after the ground shader. The color is coming too from the vertex shader, and the light point is a vec3 with a point in the space, I

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 days ago . I tried to write an application to display YUV image in OpenGL. I was successfully converted YUV to RGB in C++ using this snippet (source) static long int crv_tab[256]; static long int cbu_tab[256]; static long int cgu_tab[256]; static long int cgv_tab[256]; static long int tab_76309[256]; static unsigned char

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 days ago . I tried to write an application to display YUV image in OpenGL. I was successfully converted YUV to RGB in C++ using this snippet (source) static long int crv_tab[256]; static long int cbu_tab[256]; static long int cgu_tab[256]; static long int cgv_tab[256]; static long int tab_76309[256]; static unsigned char