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OpenGL

OpenGL . Лекция 7 ( 21.11.2013). RenderMonkey ™ Toolsuite. http://developer.amd.com/resources/archive/archived-tools/gpu-tools-archive/rendermonkey-toolsuite/# download

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OpenGL

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  1. OpenGL Лекция 7 (21.11.2013)

  2. RenderMonkey™ Toolsuite • http://developer.amd.com/resources/archive/archived-tools/gpu-tools-archive/rendermonkey-toolsuite/#download • RenderMonkey is a rich shader development environment for both programmers and artists which facilitates the collaborative creation of real-time shader effects.

  3. RenderMonkey™ Toolsuite

  4. Установка текстуры в качестве константы шейдера • glActiveTexture(GL_TEXTURE0+iTextureUnit); glBindTexture(GL_TEXTURE_2D, uiTexture); glBindSampler(iTextureUnit, uiSampler); • intiSamplerLoc = glGetUniformLocation(spMain.getProgramID(), "gSampler"); • glUniform1i(iSamplerLoc, 0);

  5. Использование текстуры в шейдере. Фрагментный шейдер • in vec2 texCoord; • out vec4 outputColor; • uniform sampler2D gSampler; • void main() • { • outputColor = texture2D(gSampler, texCoord); • }

  6. Использование текстуры в шейдере. Вершинный шейдер • uniform mat4 projectionMatrix; • uniform mat4 modelViewMatrix;   • layout (location = 0) in vec3 inPosition; • layout (location = 1) in vec2 inCoord;   • out vec2 texCoord;   • void main() • { • gl_Position = projectionMatrix*modelViewMatrix*vec4(inPosition, 1.0); • texCoord = inCoord; • }

  7. Пример фрагментного шейдера • #ifdef GL_FRAGMENT_PRECISION_HIGH • precision highp float; • #else • precision mediump float; • #endif • uniform sampler2D BaseMap; • uniform vec4 lightDir; • varying vec2 texCoord; • varying vec3 normal; • void main(void) • { • vec4 base = texture2D(BaseMap, texCoord); • float diffuse = clamp(dot(normalize(normal), vec3(lightDir)), 0.0, 1.0); • gl_FragColor = vec4(0.3 + 0.7 * diffuse) * base; • }

  8. Освещение: Направленный свет Где 'I' - интенсивность отражения (reflection), Ld = диффузный цвет источника (gl_LightSource[0].diffuse), и Md - диффузный коэффициент материала (gl_FrontMaterial.diffuse). Эта формула известна как "LambertianReflection” ("Закон косинуса Ламберта“)

  9. Вершинный шейдер •     void main() {        vec3 normal, lightDir;        vec4 diffuse;        float NdotL;normal = normalize(gl_NormalMatrix * gl_Normal);lightDir = normalize(vec3(gl_LightSource[0].position));NdotL = max(dot(normal, lightDir), 0.0);diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;gl_FrontColor =  NdotL * diffuse;gl_Position = ftransform();    }

  10. Фрагментный шейдер • Всё, что остаётся на долю пикселного шейдера - установить цвет пикселов, используя varying-переменную gl_Color • void main()    {gl_FragColor = gl_Color;    }

  11. Мировое освещение •     void main()    {        vec3 normal, lightDir;        vec4 diffuse, ambient, globalAmbient;        float NdotL;        normal = normalize(gl_NormalMatrix * gl_Normal);lightDir = normalize(vec3(gl_LightSource[0].position));NdotL = max(dot(normal, lightDir), 0.0);        diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;        ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;globalAmbient = gl_LightModel.ambient * gl_FrontMaterial.ambient;gl_FrontColor =  NdotL * diffuse + globalAmbient + ambient;gl_Position = ftransform();    }

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