I was wondering about renderingwant to render a very simple shadow map (grass)for grass, where closer looks brighter and further looks darker, from the view of the light point, yet. I can't get it did notto work.
Here is mythe relevant code:
//setting up buffers
gl.glGenFramebuffers(1, framebuff);
gl.glBindFramebuffer(GL4.GL_FRAMEBUFFER, framebuff.get(0));
gl.glGenTextures(2, textureBuff);
gl.glBindTexture(GL4.GL_TEXTURE_2D, textureBuff.get(0));
gl.glTexStorage2D(GL4.GL_TEXTURE_2D, 1, GL4.GL_R32F, displayWidth, displayHeight);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_MAG_FILTER, GL4.GL_LINEAR);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_MIN_FILTER, GL4.GL_LINEAR_MIPMAP_LINEAR);
gl.glFramebufferTexture(GL4.GL_FRAMEBUFFER, GL4.GL_COLOR_ATTACHMENT0, textureBuff.get(0), 0);
gl.glBindTexture(GL4.GL_TEXTURE_2D, textureBuff.get(1));
gl.glTexStorage2D(GL4.GL_TEXTURE_2D, 1, GL4.GL_DEPTH_COMPONENT32F, displayWidth, displayHeight);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_MAG_FILTER, GL4.GL_LINEAR);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_MIN_FILTER, GL4.GL_LINEAR_MIPMAP_LINEAR);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_COMPARE_MODE, GL4.GL_COMPARE_REF_TO_TEXTURE);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_COMPARE_FUNC, GL4.GL_LEQUAL);
gl.glFramebufferTexture(GL4.GL_FRAMEBUFFER, GL4.GL_DEPTH_ATTACHMENT, textureBuff.get(1), 0);
gl.glDrawBuffer(GL4.GL_NONE);
if(gl.glCheckFramebufferStatus(GL4.GL_FRAMEBUFFER) != GL4.GL_FRAMEBUFFER_COMPLETE)
System.out.println(gl.glCheckFramebufferStatus(GL4.GL_FRAMEBUFFER));
drawingDrawing command (not sureunsure if it's correct):
//gl.glBindFramebuffer(GL4.GL_FRAMEBUFFER, framebuff.get(0));
gl.glViewport(0, 0, displayWidth, displayWidth);
gl.glEnable(GL4.GL_POLYGON_OFFSET_FILL);
gl.glPolygonOffset(2.0f, 4.0f);
/*
gl.glClearBufferfv(GL4.GL_COLOR, 0, new float[] {0, 0, 0}, 0);
gl.glClearDepth(1.0f);
gl.glClear(GL4.GL_DEPTH_BUFFER_BIT);*/
setupMVPMatrix();
gl.glBindVertexArray(vaoBuff.get(0));
gl.glUseProgram(shaderProgram);
gl.glDrawArraysInstanced(GL4.GL_TRIANGLE_STRIP, 0, 5, 512 * 512);
gl.glDisable(GL4.GL_POLYGON_OFFSET_FILL);
//gl.glBindFramebuffer(GL4.GL_FRAMEBUFFER, 0);
whenWhen I comment the glBindFramebuffer()glBindFramebuffer(), the grass appears correctly with the white color (from the light point of view, which shows the matrix should be correct).
:
But if I call glBindFramebuffer()glBindFramebuffer() with the depth test enabled, everything just disappeared while I expect the closer grass to be brighter and further grass to be darkerdisappears. I have also checked the framebuffer status, yet it seems there is no error. Any help
What might cause this?
