mirror of https://github.com/OpenMW/openmw.git
multiview linker-method
Mads Buvik Sandvei
3 years ago
committed by
madsbuvi
parent
dd5901d351
commit
606a795a54
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#ifndef MULTIVIEW_FRAGMENT
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#define MULTIVIEW_FRAGMENT
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// This file either enables or disables GL_OVR_multiview2 related code.
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// For use in fragment shaders
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// REQUIREMENT:
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// GLSL version: 330 or greater
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// GLSL profile: compatibility
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// NOTE: If stereo is enabled using Misc::StereoView::shaderStereoDefines, version 330 compatibility (or greater) will be set.
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//
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// This file provides symbols for sampling stereo-aware textures. Without multiview, these texture uniforms are sampler2D,
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// while in stereo the same uniforms are sampler2DArray instead. The symbols defined in this file mask this difference, allowing
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// the same code to work in both cases. Use mw_stereoAwareSampler2D and mw_stereoAwareTexture2D, where you otherwise would use
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// sampler2D and texture2D()
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//
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// USAGE:
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// For stereo-aware textures, such as reflections, use the mw_stereoAwareSampler2D sampler and mw_stereoAwareTexture2D method
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// instead of the usual sampler2D and texture2D.
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//
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// Using water reflection as an example, the old code for these textures changes from
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// uniform sampler2D reflectionMap;
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// ...
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// vec3 reflection = texture2D(reflectionMap, screenCoords + screenCoordsOffset).rgb;
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//
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// to
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// uniform mw_stereoAwareSampler2D reflectionMap;
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// ...
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// vec3 reflection = mw_stereoAwareTexture2D(reflectionMap, screenCoords + screenCoordsOffset).rgb;
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//
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#if @useOVR_multiview
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#extension GL_OVR_multiview : require
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#extension GL_OVR_multiview2 : require
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#extension GL_EXT_texture_array : require
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#define mw_stereoAwareSampler2D sampler2DArray
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#define mw_stereoAwareTexture2D(texture, uv) texture2DArray(texture, vec3((uv), gl_ViewID_OVR))
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#else // useOVR_multiview
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#define mw_stereoAwareSampler2D sampler2D
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#define mw_stereoAwareTexture2D(texture, uv) texture2D(texture, uv)
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#endif // useOVR_multiview
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#endif // MULTIVIEW_FRAGMENT
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#ifndef MULTIVIEW_VERTEX
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#define MULTIVIEW_VERTEX
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// This file either enables or disables GL_OVR_multiview related code.
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// For use in vertex shaders
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// REQUIREMENT:
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// GLSL version: 330 or greater
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// GLSL profile: compatibility
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// NOTE: If stereo is enabled using Misc::StereoView::shaderStereoDefines, version 330 compatibility (or greater) will be set.
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// USAGE:
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// To create a stereo-aware vertex shader, use the matrix accessor functions defined in this .glsl file to compute gl_Position.
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// For the vertex stage, usually only gl_Position needs to be computed with stereo awareness, while other variables such as viewPos
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// should be computed in the center camera's view space and take no stereo awareness.
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//
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// A typical gl_Position line will look like the following:
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// gl_Position = mw_stereoAwareProjectionMatrix() * (mw_stereoAwareModelViewMatrix() * gl_Vertex);
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//
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// If you need to perform intermediate computations before determining the final values of gl_Position and viewPos,
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// your code might look more like the following:
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// vec4 intermediateViewPos = gl_ModelViewMatrix * gl_Vertex;
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// vec4 viewPos = myWhateverCode(intermediateViewPos);
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// gl_Position = mw_stereoAwareProjectionMatrix() * mw_stereoAwareViewPosition(viewPos);
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//
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#if @useOVR_multiview
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#extension GL_OVR_multiview : require
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#ifndef MULTIVIEW_FRAGMENT
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// Layout cannot be used in the fragment shader
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layout(num_views = @numViews) in;
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#endif
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uniform mat4 projectionMatrixMultiView[@numViews];
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uniform mat4 viewMatrixMultiView[@numViews];
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// NOTE:
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// stereo-aware inverse view matrices and normal matrices have not been implemented.
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// Some effects like specular highlights would need stereo aware normal matrices to be 100% correct.
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// But the difference is not likely to be noticeable unless you're actively looking for it.
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mat4 mw_stereoAwareProjectionMatrix()
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{
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return projectionMatrixMultiView[gl_ViewID_OVR];
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}
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mat4 mw_stereoAwareModelViewMatrix()
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{
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return viewMatrixMultiView[gl_ViewID_OVR] * gl_ModelViewMatrix;
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}
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vec4 mw_stereoAwareViewPosition(vec4 viewPos)
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{
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return viewMatrixMultiView[gl_ViewID_OVR] * viewPos;
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}
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#else // useOVR_multiview
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uniform mat4 projectionMatrix;
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mat4 mw_stereoAwareProjectionMatrix()
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{
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return projectionMatrix;
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}
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mat4 mw_stereoAwareModelViewMatrix()
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{
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return gl_ModelViewMatrix;
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}
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vec4 mw_stereoAwareViewPosition(vec4 viewPos)
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{
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return viewPos;
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}
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#endif // useOVR_multiview
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#endif // MULTIVIEW_VERTEX
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@ -0,0 +1,31 @@
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#version 330 compatibility
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#extension GL_OVR_multiview : require
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#extension GL_OVR_multiview2 : require
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#extension GL_EXT_texture_array : require
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#include "openmw_fragment.h.glsl"
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uniform sampler2DArray reflectionMap;
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vec4 mw_sampleReflectionMap(vec2 uv)
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{
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return texture2DArray(reflectionMap, vec3((uv), gl_ViewID_OVR));
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}
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#if @refraction_enabled
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uniform sampler2DArray refractionMap;
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uniform sampler2DArray refractionDepthMap;
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vec4 mw_sampleRefractionMap(vec2 uv)
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{
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return texture2DArray(refractionMap, vec3((uv), gl_ViewID_OVR));
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}
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float mw_sampleRefractionDepthMap(vec2 uv)
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{
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return texture2DArray(refractionDepthMap, vec3((uv), gl_ViewID_OVR)).x;
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}
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#endif
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@ -0,0 +1,41 @@
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#version 330 compatibility
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#extension GL_OVR_multiview : require
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#extension GL_OVR_multiview2 : require
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layout(num_views = @numViews) in;
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#include "openmw_vertex.h.glsl"
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uniform mat4 projectionMatrixMultiView[@numViews];
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uniform mat4 viewMatrixMultiView[@numViews];
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vec4 mw_modelToClip(vec4 pos)
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{
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return projectionMatrixMultiView[gl_ViewID_OVR] * mw_modelToView(pos);
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}
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vec4 mw_modelToView(vec4 pos)
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{
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return viewMatrixMultiView[gl_ViewID_OVR] * gl_ModelViewMatrix * pos;
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}
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vec4 mw_viewToClip(vec4 pos)
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{
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return projectionMatrixMultiView[gl_ViewID_OVR] * pos;
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}
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vec4 mw_viewStereoAdjust(vec4 pos)
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{
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return viewMatrixMultiView[gl_ViewID_OVR] * pos;
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}
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mat4 mw_viewMatrix()
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{
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return viewMatrixMultiView[gl_ViewID_OVR] * gl_ModelViewMatrix;
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}
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mat4 mw_projectionMatrix()
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{
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return projectionMatrixMultiView[gl_ViewID_OVR];
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}
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