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Much improved cube map visualization

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Now displays all six cube map faces as a single cross
This commit is contained in:
Sascha Willems 2019-04-15 21:30:57 +02:00
parent 50e4972d02
commit bfdf821d31
5 changed files with 57 additions and 20 deletions
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47
data/shaders/shadowmapomni/cubemapdisplay.frag
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@ -2,12 +2,53 @@
layout (binding = 1) uniform samplerCube shadowCubeMap;
layout (location = 0) in vec3 inUVW;
layout (location = 0) in vec2 inUV;
layout (location = 0) out vec4 outFragColor;
void main()
{
float dist = length(texture(shadowCubeMap, inUVW).rgb) * 0.005;
outFragColor = vec4(vec3(dist), 1.0);
outFragColor.rgb = vec3(0.0, 0.0, 0.2);
vec3 samplePos = vec3(0.0f);
// Crude statement to visualize different cube map faces based on UV coordinates
int x = int(floor(inUV.x / 0.25f));
int y = int(floor(inUV.y / (1.0 / 3.0)));
if (y == 1) {
vec2 uv = vec2(inUV.x * 4.0f, (inUV.y - 1.0/3.0) * 3.0);
uv = 2.0 * vec2(uv.x - float(x) * 1.0, uv.y) - 1.0;
switch (x) {
case 0: // NEGATIVE_X
samplePos = vec3(-1.0f, uv.y, uv.x);
break;
case 1: // POSITIVE_Z
samplePos = vec3(uv.x, uv.y, 1.0f);
break;
case 2: // POSITIVE_X
samplePos = vec3(1.0, uv.y, -uv.x);
break;
case 3: // NEGATIVE_Z
samplePos = vec3(-uv.x, uv.y, -1.0f);
break;
}
} else {
if (x == 1) {
vec2 uv = vec2((inUV.x - 0.25) * 4.0, (inUV.y - float(y) / 3.0) * 3.0);
uv = 2.0 * uv - 1.0;
switch (y) {
case 0: // NEGATIVE_Y
samplePos = vec3(uv.x, -1.0f, uv.y);
break;
case 2: // POSITIVE_Y
samplePos = vec3(uv.x, 1.0f, -uv.y);
break;
}
}
}
if ((samplePos.x != 0.0f) && (samplePos.y != 0.0f)) {
float dist = length(texture(shadowCubeMap, samplePos).xyz) * 0.005;
outFragColor = vec4(vec3(dist), 1.0);
}
}

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data/shaders/shadowmapomni/cubemapdisplay.frag.spv
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13
data/shaders/shadowmapomni/cubemapdisplay.vert
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@ -1,7 +1,5 @@
#version 450
layout (location = 0) in vec3 inPos;
layout (binding = 0) uniform UBO
{
mat4 projection;
@ -9,16 +7,11 @@ layout (binding = 0) uniform UBO
mat4 model;
} ubo;
layout (location = 0) out vec3 outUVW;
out gl_PerVertex
{
vec4 gl_Position;
};
layout (location = 0) out vec2 outUV;
void main()
{
outUVW = inPos;
gl_Position = ubo.projection * ubo.model * vec4(inPos.xyz, 1.0);
outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
gl_Position = vec4(outUV.xy * 2.0f - 1.0f, 0.0f, 1.0f);
}

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data/shaders/shadowmapomni/cubemapdisplay.vert.spv
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17
examples/shadowmappingomni/shadowmappingomni.cpp
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@ -78,7 +78,7 @@ public:
struct {
VkPipeline scene;
VkPipeline offscreen;
VkPipeline cubeMap;
VkPipeline cubemapDisplay;
} pipelines;
struct {
@ -154,7 +154,7 @@ public:
// Pipelibes
vkDestroyPipeline(device, pipelines.scene, nullptr);
vkDestroyPipeline(device, pipelines.offscreen, nullptr);
vkDestroyPipeline(device, pipelines.cubeMap, nullptr);
vkDestroyPipeline(device, pipelines.cubemapDisplay, nullptr);
vkDestroyPipelineLayout(device, pipelineLayouts.scene, nullptr);
vkDestroyPipelineLayout(device, pipelineLayouts.offscreen, nullptr);
@ -552,10 +552,12 @@ public:
if (displayCubeMap)
{
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.cubeMap);
// Display all six sides of the shadow cube map
// Note: Visualization of the different faces is done in the fragment shader, see cubemapdisplay.frag
vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.cubemapDisplay);
vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, 1, &models.skybox.vertices.buffer, offsets);
vkCmdBindIndexBuffer(drawCmdBuffers[i], models.skybox.indices.buffer, 0, VK_INDEX_TYPE_UINT32);
vkCmdDrawIndexed(drawCmdBuffers[i], models.skybox.indexCount, 1, 0, 0, 0);
vkCmdDraw(drawCmdBuffers[i], 3, 1, 0, 0);
}
else
{
@ -752,15 +754,16 @@ public:
// Cube map display pipeline
shaderStages[0] = loadShader(getAssetPath() + "shaders/shadowmapomni/cubemapdisplay.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getAssetPath() + "shaders/shadowmapomni/cubemapdisplay.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
rasterizationState.cullMode = VK_CULL_MODE_FRONT_BIT;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.cubeMap));
VkPipelineVertexInputStateCreateInfo emptyInputState = vks::initializers::pipelineVertexInputStateCreateInfo();
pipelineCreateInfo.pVertexInputState = &emptyInputState;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.cubemapDisplay));
// Offscreen pipeline
shaderStages[0] = loadShader(getAssetPath() + "shaders/shadowmapomni/offscreen.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
shaderStages[1] = loadShader(getAssetPath() + "shaders/shadowmapomni/offscreen.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
rasterizationState.cullMode = VK_CULL_MODE_BACK_BIT;
pipelineCreateInfo.layout = pipelineLayouts.offscreen;
pipelineCreateInfo.renderPass = offscreenPass.renderPass;
pipelineCreateInfo.pVertexInputState = &vertexInputState;
VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.offscreen));
}